Lambdas

src/androidTest/java/com/todoroo/andlib/test/TranslationTests.java

@@ -187,8 +187,7 @@ abstract public class TranslationTests extends AndroidTestCase {
         }
 
 
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             Locale locale = r.getConfiguration().locale;
             for(int i = 0; i < strings.length; i++) {
                 try {
@@ -209,7 +208,6 @@ abstract public class TranslationTests extends AndroidTestCase {
                             locale.toString(), name, e.getMessage()));
                 }
             }
-            }
         });
 
         assertTrue(failures.toString(), errorCount(failures) == 0);
@@ -225,8 +223,7 @@ abstract public class TranslationTests extends AndroidTestCase {
         final int[] dateStrings = getDateFormatStrings();
         final DateTime date = newDateTime();
 
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             Locale locale = r.getConfiguration().locale;
             for (int dateString : dateStrings) {
                 try {
@@ -244,7 +241,6 @@ abstract public class TranslationTests extends AndroidTestCase {
                             locale.toString(), name, e.getMessage()));
                 }
             }
-            }
         });
 
         assertEquals(failures.toString(), 0, errorCount(failures));
@@ -271,8 +267,7 @@ abstract public class TranslationTests extends AndroidTestCase {
             }
         }
 
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             for(int i = 0; i < arrays.length; i++) {
                 if(sizes[i] == -1)
                     continue;
@@ -294,7 +289,6 @@ abstract public class TranslationTests extends AndroidTestCase {
                             name, locale.toString(), size, sizes[i]));
                 }
             }
-            }
         });
         assertEquals(failures.toString(), 0, errorCount(failures));
     }

src/androidTest/java/com/todoroo/andlib/utility/DateUtilitiesTest.java

@@ -59,8 +59,7 @@ public class DateUtilitiesTest extends AndroidTestCase {
     }
 
     public void testTimeString() {
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             DateTime d = newDateTime();
 
             DateUtilities.is24HourOverride = false;
@@ -74,20 +73,17 @@ public class DateUtilitiesTest extends AndroidTestCase {
                 d = d.withHourOfDay(i);
                 getTimeString(getContext(), d);
             }
-            }
         });
     }
 
     public void testDateString() {
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             DateTime d = newDateTime();
 
             for (int i = 0; i < 12; i++) {
                 d = d.withMonthOfYear(i);
                 getDateString(d);
             }
-            }
         });
     }
 

src/androidTest/java/com/todoroo/astrid/test/AstridTranslationTest.java

@@ -53,12 +53,10 @@ public class AstridTranslationTest extends TranslationTests {
         final Resources r = getContext().getResources();
         final StringBuilder failures = new StringBuilder();
 
-        forEachLocale(new Runnable() {
+        forEachLocale(() -> {
-            public void run() {
             contains(r, R.string.CFC_tag_text, failures, "?");
             contains(r, R.string.CFC_title_contains_text, failures, "?");
             contains(r, R.string.CFC_dueBefore_text, failures, "?");
-            }
         });
 
         assertEquals(failures.toString(), 0,

src/androidTest/java/org/tasks/makers/GtaskListMaker.java

@@ -22,10 +22,7 @@ public class GtaskListMaker {
         return make(instantiator, properties);
     }
 
-    private static final Instantiator<GtasksList> instantiator = new Instantiator<GtasksList>() {
+    private static final Instantiator<GtasksList> instantiator = lookup -> new GtasksList(new StoreObject() {{
-        @Override
-        public GtasksList instantiate(final PropertyLookup<GtasksList> lookup) {
-            return new GtasksList(new StoreObject() {{
         setType(GtasksList.TYPE);
         setValue(StoreObject.ID, lookup.valueOf(GtaskListMaker.ID, 1L));
         setValue(StoreObject.ITEM, lookup.valueOf(REMOTE_ID, "1"));
@@ -34,5 +31,3 @@ public class GtaskListMaker {
         setValue(StoreObject.VALUE3, String.valueOf(lookup.valueOf(LAST_SYNC, 0L)));
     }});
 }
-    };
-}

src/androidTest/java/org/tasks/makers/TaskMaker.java

@@ -24,9 +24,7 @@ public class TaskMaker {
         return make(instantiator, properties);
     }
 
-    private static final Instantiator<Task> instantiator = new Instantiator<Task>() {
+    private static final Instantiator<Task> instantiator = lookup -> {
-        @Override
-        public Task instantiate(PropertyLookup<Task> lookup) {
         Task task = new Task();
 
         DateTime dueDate = lookup.valueOf(DUE_DATE, (DateTime) null);
@@ -55,6 +53,5 @@ public class TaskMaker {
         }
 
         return task;
-        }
     };
 }

src/androidTestGoogleplay/java/org/tasks/makers/RemoteGtaskListMaker.java

@@ -19,13 +19,8 @@ public class RemoteGtaskListMaker {
         return make(instantiator, properties);
     }
 
-    private static final Instantiator<TaskList> instantiator = new Instantiator<TaskList>() {
+    private static final Instantiator<TaskList> instantiator = lookup -> new TaskList()
-        @Override
-        public TaskList instantiate(final PropertyLookup<TaskList> lookup) {
-            return new TaskList()
             .setId(lookup.valueOf(REMOTE_ID, "1"))
             .setTitle(lookup.valueOf(NAME, "Default"))
             .setUpdated(new DateTime(currentTimeMillis()));
 }
-    };
-}

src/googleplay/java/com/android/vending/billing/IabHelper.java

@@ -654,8 +654,7 @@ public class IabHelper {
         checkNotDisposed();
         checkSetupDone("queryInventory");
         flagStartAsync("refresh inventory");
-        executor.execute(new Runnable() {
+        executor.execute(() -> {
-            public void run() {
             IabResult result = new IabResult(BILLING_RESPONSE_RESULT_OK, "Inventory refresh successful.");
             Inventory inv = null;
             try {
@@ -670,12 +669,7 @@ public class IabHelper {
             final IabResult result_f = result;
             final Inventory inv_f = inv;
             if (!mDisposed && listener != null) {
-                    handler.post(new Runnable() {
+                handler.post(() -> listener.onQueryInventoryFinished(result_f, inv_f));
-                        public void run() {
-                            listener.onQueryInventoryFinished(result_f, inv_f);
-                        }
-                    });
-                }
             }
         });
     }
@@ -1011,8 +1005,7 @@ public class IabHelper {
                               final OnConsumeMultiFinishedListener multiListener) {
         final Handler handler = new Handler();
         flagStartAsync("consume");
-        executor.execute(new Runnable() {
+        executor.execute(() -> {
-            public void run() {
             final List<IabResult> results = new ArrayList<IabResult>();
             for (Purchase purchase : purchases) {
                 try {
@@ -1026,19 +1019,10 @@ public class IabHelper {
 
             flagEndAsync();
             if (!mDisposed && singleListener != null) {
-                    handler.post(new Runnable() {
+                handler.post(() -> singleListener.onConsumeFinished(purchases.get(0), results.get(0)));
-                        public void run() {
-                            singleListener.onConsumeFinished(purchases.get(0), results.get(0));
-                        }
-                    });
             }
             if (!mDisposed && multiListener != null) {
-                    handler.post(new Runnable() {
+                handler.post(() -> multiListener.onConsumeMultiFinished(purchases, results));
-                        public void run() {
-                            multiListener.onConsumeMultiFinished(purchases, results);
-                        }
-                    });
-                }
             }
         });
     }

src/googleplay/java/com/todoroo/astrid/gtasks/GtasksFilterExposer.java

@@ -46,12 +46,7 @@ public class GtasksFilterExposer {
         for (GtasksList list : gtasksListService.getLists()) {
             listFilters.add(filterFromList(list));
         }
-        Collections.sort(listFilters, new Comparator<Filter>() {
+        Collections.sort(listFilters, (filter, t1) -> filter.listingTitle.compareTo(t1.listingTitle));
-            @Override
-            public int compare(Filter filter, Filter t1) {
-                return filter.listingTitle.compareTo(t1.listingTitle);
-            }
-        });
         return listFilters;
     }
 

src/googleplay/java/com/todoroo/astrid/gtasks/GtasksPreferences.java

@@ -55,9 +55,7 @@ public class GtasksPreferences extends InjectingPreferenceActivity implements Go
 
         final CheckBoxPreference gtaskPreference = (CheckBoxPreference) findPreference(getString(R.string.sync_gtasks));
         gtaskPreference.setChecked(syncAdapterHelper.isEnabled());
-        gtaskPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        gtaskPreference.setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if ((boolean) newValue) {
                 if (!playServicesAvailability.refreshAndCheck()) {
                     playServicesAvailability.resolve(GtasksPreferences.this);
@@ -71,47 +69,34 @@ public class GtasksPreferences extends InjectingPreferenceActivity implements Go
                 gtasksPreferenceService.stopOngoing();
                 return true;
             }
-            }
         });
         if (gtasksPreferenceService.getLastSyncDate() > 0) {
             gtaskPreference.setSummary(getString(R.string.sync_status_success,
                     DateUtilities.getDateStringWithTime(GtasksPreferences.this,
                             gtasksPreferenceService.getLastSyncDate())));
         }
-        findPreference(getString(R.string.gtasks_GPr_interval_key)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        findPreference(getString(R.string.gtasks_GPr_interval_key)).setOnPreferenceChangeListener((preference, o) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object o) {
             syncAdapterHelper.setSynchronizationInterval(Integer.parseInt((String) o));
             return true;
-            }
         });
-        findPreference(getString(R.string.sync_SPr_forget_key)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.sync_SPr_forget_key)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             dialogBuilder.newMessageDialog(R.string.sync_forget_confirm)
-                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(android.R.string.ok, (dialog, which) -> {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
                         gtasksPreferenceService.clearLastSyncDate();
                         gtasksPreferenceService.setUserName(null);
                         metadataDao.deleteWhere(Metadata.KEY.eq(GtasksMetadata.METADATA_KEY));
                         syncAdapterHelper.enableSynchronization(false);
                         tracker.reportEvent(Tracking.Events.GTASK_LOGOUT);
                         gtaskPreference.setChecked(false);
-                            }
                     })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();
             return true;
-            }
         });
-        getPref(R.string.p_gtasks_default_list).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        getPref(R.string.p_gtasks_default_list).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             new NativeGoogleTaskListPicker()
                     .show(getFragmentManager(), FRAG_TAG_GOOGLE_TASK_LIST_SELECTION);
             return false;
-            }
         });
         updateDefaultGoogleTaskList();
     }

src/googleplay/java/com/todoroo/astrid/gtasks/GtasksTaskListUpdater.java

@@ -110,9 +110,7 @@ public class GtasksTaskListUpdater extends OrderedMetadataListUpdater<GtasksList
                 GtasksMetadata.LIST_ID.eq(listId),
                 GtasksMetadata.PARENT_TASK.eq(parent)))
                 .orderBy(Order.asc(Functions.cast(GtasksMetadata.GTASKS_ORDER, "INTEGER")));
-        metadataDao.query(query, new Callback<Metadata>() {
+        metadataDao.query(query, curr -> {
-                    @Override
-                    public void apply(Metadata curr) {
             if (!alreadyChecked.contains(curr.getTask())) {
                 curr.setValue(GtasksMetadata.INDENT, indentLevel);
                 curr.setValue(GtasksMetadata.ORDER, order.getAndIncrement());
@@ -122,7 +120,6 @@ public class GtasksTaskListUpdater extends OrderedMetadataListUpdater<GtasksList
                 orderAndIndentHelper(listId, order, curr.getTask(), indentLevel + 1, alreadyChecked);
             }
         }
-                }
         );
     }
 
@@ -130,9 +127,7 @@ public class GtasksTaskListUpdater extends OrderedMetadataListUpdater<GtasksList
         final AtomicLong previousTask = new AtomicLong(Task.NO_ID);
         final AtomicInteger previousIndent = new AtomicInteger(-1);
 
-        iterateThroughList(list, new OrderedListIterator() {
+        iterateThroughList(list, (taskId, metadata) -> {
-            @Override
-            public void processTask(long taskId, Metadata metadata) {
             int indent = metadata.getValue(GtasksMetadata.INDENT);
 
             try {
@@ -166,7 +161,6 @@ public class GtasksTaskListUpdater extends OrderedMetadataListUpdater<GtasksList
             if(!TextUtils.isEmpty(metadata.getValue(GtasksMetadata.ID))) {
                 localToRemoteIdMap.put(taskId, metadata.getValue(GtasksMetadata.ID));
             }
-            }
         });
     }
 }

src/googleplay/java/com/todoroo/astrid/gtasks/OrderedMetadataListFragmentHelper.java

@@ -199,12 +199,7 @@ public class OrderedMetadataListFragmentHelper<LIST> implements OrderedListFragm
         taskAdapter = new DraggableTaskAdapter(context, preferences, fragment, cursor,
                 sqlQueryTemplate, dialogBuilder, checkBoxes, tagService, themeCache);
 
-        taskAdapter.addOnCompletedTaskListener(new OnCompletedTaskListener() {
+        taskAdapter.addOnCompletedTaskListener(this::setCompletedForItemAndSubtasks);
-            @Override
-            public void onCompletedTask(Task item, boolean newState) {
-                setCompletedForItemAndSubtasks(item, newState);
-            }
-        });
 
         return taskAdapter;
     }
@@ -253,9 +248,7 @@ public class OrderedMetadataListFragmentHelper<LIST> implements OrderedListFragm
 
         final ArrayList<Long> chained = new ArrayList<>();
         final int parentIndent = item.getValue(updater.indentProperty());
-        updater.applyToChildren(list, itemId, new OrderedMetadataListUpdater.OrderedListNodeVisitor() {
+        updater.applyToChildren(list, itemId, node -> {
-            @Override
-            public void visitNode(OrderedMetadataListUpdater.Node node) {
             Task childTask = taskService.fetchById(node.taskId, Task.RECURRENCE);
             if(!TextUtils.isEmpty(childTask.getRecurrence())) {
                 Metadata metadata = updater.getTaskMetadata(node.taskId);
@@ -269,7 +262,6 @@ public class OrderedMetadataListFragmentHelper<LIST> implements OrderedListFragm
             model.clear();
 
             chained.add(node.taskId);
-            }
         });
 
         if(chained.size() > 0) {

src/googleplay/java/com/todoroo/astrid/gtasks/OrderedMetadataListUpdater.java

@@ -68,9 +68,7 @@ abstract public class OrderedMetadataListUpdater<LIST> {
         final AtomicLong previousTask = new AtomicLong(Task.NO_ID);
         final AtomicLong globalOrder = new AtomicLong(-1);
 
-        iterateThroughList(list, new OrderedListIterator() {
+        iterateThroughList(list, (taskId, metadata) -> {
-            @Override
-            public void processTask(long taskId, Metadata metadata) {
             if(!metadata.isSaved()) {
                 metadata = createEmptyMetadata(list, taskId);
             }
@@ -113,8 +111,6 @@ abstract public class OrderedMetadataListUpdater<LIST> {
             if(!metadata.isSaved()) {
                 saveAndUpdateModifiedDate(metadata);
             }
-            }
-
         });
         onMovedOrIndented(getTaskMetadata(targetTaskId));
     }
@@ -129,9 +125,7 @@ abstract public class OrderedMetadataListUpdater<LIST> {
         final AtomicLong lastPotentialParent = new AtomicLong(Task.NO_ID);
         final AtomicBoolean computedParent = new AtomicBoolean(false);
 
-        iterateThroughList(list, new OrderedListIterator() {
+        iterateThroughList(list, (taskId, metadata) -> {
-            @Override
-            public void processTask(long taskId, Metadata metadata) {
             if (targetTask.get() == taskId) {
                 computedParent.set(true);
             }
@@ -140,7 +134,6 @@ abstract public class OrderedMetadataListUpdater<LIST> {
             if (!computedParent.get() && indent == desiredParentIndent.get()) {
                 lastPotentialParent.set(taskId);
             }
-            }
         });
 
         if (lastPotentialParent.get() == Task.NO_ID) {
@@ -254,9 +247,7 @@ abstract public class OrderedMetadataListUpdater<LIST> {
         final AtomicInteger previoustIndent = new AtomicInteger(-1);
         final AtomicReference<Node> currentNode = new AtomicReference<>(root);
 
-        iterateThroughList(list, new OrderedListIterator() {
+        iterateThroughList(list, (taskId, metadata) -> {
-            @Override
-            public void processTask(long taskId, Metadata metadata) {
             int indent = metadata.getValue(indentProperty());
 
             int previousIndentValue = previoustIndent.get();
@@ -282,7 +273,6 @@ abstract public class OrderedMetadataListUpdater<LIST> {
             }
 
             previoustIndent.set(indent);
-            }
         });
         return root;
     }

src/googleplay/java/com/todoroo/astrid/gtasks/auth/GtasksLoginActivity.java

@@ -88,12 +88,7 @@ public class GtasksLoginActivity extends InjectingAppCompatActivity implements A
 
             @Override
             public void authenticationFailed(final String message) {
-                runOnUiThread(new Runnable() {
+                runOnUiThread(() -> Toast.makeText(GtasksLoginActivity.this, message, Toast.LENGTH_LONG).show());
-                    @Override
-                    public void run() {
-                        Toast.makeText(GtasksLoginActivity.this, message, Toast.LENGTH_LONG).show();
-                    }
-                });
                 DialogUtilities.dismissDialog(GtasksLoginActivity.this, pd);
             }
         });

src/googleplay/java/com/todoroo/astrid/gtasks/sync/GtasksSyncService.java

@@ -173,15 +173,12 @@ public class GtasksSyncService {
                 startAtCriterion)).
                 orderBy(order);
 
-        metadataDao.query(query, new Callback<Metadata>() {
+        metadataDao.query(query, entry -> {
-            @Override
-            public void apply(Metadata entry) {
             long taskId = entry.getValue(Metadata.TASK);
             Metadata metadata = metadataDao.getFirstActiveByTaskAndKey(taskId, GtasksMetadata.METADATA_KEY);
             if(metadata != null) {
                 iterator.processTask(taskId, metadata);
             }
-            }
         });
     }
 
@@ -210,9 +207,7 @@ public class GtasksSyncService {
         final AtomicInteger indentToMatch = new AtomicInteger(gtasksMetadata.getValue(GtasksMetadata.INDENT));
         final AtomicLong parentToMatch = new AtomicLong(gtasksMetadata.getValue(GtasksMetadata.PARENT_TASK));
         final AtomicReference<String> sibling = new AtomicReference<>();
-        OrderedMetadataListUpdater.OrderedListIterator iterator = new OrderedMetadataListUpdater.OrderedListIterator() {
+        OrderedMetadataListUpdater.OrderedListIterator iterator = (taskId, metadata) -> {
-            @Override
-            public void processTask(long taskId, Metadata metadata) {
             Task t = taskDao.fetch(taskId, Task.TITLE, Task.DELETION_DATE);
             if (t == null || t.isDeleted()) {
                 return;
@@ -225,7 +220,6 @@ public class GtasksSyncService {
                     sibling.set(metadata.getValue(GtasksMetadata.ID));
                 }
             }
-            }
         };
 
         iterateThroughList(listId, iterator, gtasksMetadata.getValue(GtasksMetadata.ORDER), true);

src/googleplay/java/com/todoroo/astrid/service/SyncV2Service.java

@@ -40,16 +40,13 @@ public class SyncV2Service {
 
     public void clearCompleted(final GtasksList list, final SyncResultCallback callback) {
         if (syncAdapterHelper.isEnabled()) {
-            syncExecutor.execute(callback, new Runnable() {
+            syncExecutor.execute(callback, () -> {
-                @Override
-                public void run() {
                 callback.started();
                 try {
                     gtasksSyncService.clearCompleted(list.getRemoteId());
                 } finally {
                     callback.finished();
                 }
-                }
             });
         }
     }

src/googleplay/java/org/tasks/AccountManager.java

@@ -50,12 +50,7 @@ public class AccountManager {
     }
 
     public List<String> getAccounts() {
-        return transform(getAccountList(), new Function<Account, String>() {
+        return transform(getAccountList(), account -> account.name);
-            @Override
-            public String apply(Account account) {
-                return account.name;
-            }
-        });
     }
 
     public boolean hasAccount(final String name) {
@@ -71,9 +66,7 @@ public class AccountManager {
         if (account == null) {
             handler.authenticationFailed(activity.getString(R.string.gtasks_error_accountNotFound, accountName));
         } else {
-                new Thread(new Runnable() {
+                new Thread(() -> {
-                    @Override
-                    public void run() {
                     try {
                         GoogleAuthUtil.getToken(activity, account, "oauth2:" + TasksScopes.TASKS, null);
                         handler.authenticationSuccessful(accountName);
@@ -84,7 +77,6 @@ public class AccountManager {
                         Timber.e(e, e.getMessage());
                         handler.authenticationFailed(context.getString(R.string.gtasks_GLA_errorIOAuth));
                     }
-                    }
                 }).start();
         }
     }
@@ -100,11 +92,6 @@ public class AccountManager {
             return null;
         }
 
-        return tryFind(getAccountList(), new Predicate<Account>() {
+        return tryFind(getAccountList(), account -> name.equalsIgnoreCase(account.name)).orNull();
-            @Override
-            public boolean apply(Account account) {
-                return name.equalsIgnoreCase(account.name);
-            }
-        }).orNull();
     }
 }

src/googleplay/java/org/tasks/activities/NativeGoogleTaskListPicker.java

@@ -25,12 +25,7 @@ public class NativeGoogleTaskListPicker extends InjectingNativeDialogFragment {
 
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        return createDialog(dialogBuilder, gtasksListService, new GoogleTaskListSelectionHandler() {
+        return createDialog(dialogBuilder, gtasksListService, list -> handler.selectedList(list));
-            @Override
-            public void selectedList(GtasksList list) {
-                handler.selectedList(list);
-            }
-        });
     }
 
     @Override

src/googleplay/java/org/tasks/activities/SupportGoogleTaskListPicker.java

@@ -30,12 +30,7 @@ public class SupportGoogleTaskListPicker extends InjectingDialogFragment {
 
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        return createDialog(dialogBuilder, gtasksListService, new GoogleTaskListSelectionHandler() {
+        return createDialog(dialogBuilder, gtasksListService, list -> handler.selectedList(list));
-            @Override
-            public void selectedList(GtasksList list) {
-                handler.selectedList(list);
-            }
-        });
     }
 
     @Override
@@ -47,26 +42,13 @@ public class SupportGoogleTaskListPicker extends InjectingDialogFragment {
 
     public static AlertDialog createDialog(DialogBuilder dialogBuilder, GtasksListService gtasksListService, final GoogleTaskListSelectionHandler handler) {
         final List<GtasksList> lists = gtasksListService.getLists();
-        List<String> listNames = transform(lists, new Function<GtasksList, String>() {
+        List<String> listNames = transform(lists, GtasksList::getName);
-            @Override
-            public String apply(GtasksList gtasksList) {
-                return gtasksList.getName();
-            }
-        });
         return dialogBuilder.newDialog()
-                .setItems(listNames, new DialogInterface.OnClickListener() {
+                .setItems(listNames, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     handler.selectedList(lists.get(which));
                     dialog.dismiss();
-                    }
-                })
-                .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        dialog.dismiss();
-                    }
                 })
+                .setNegativeButton(android.R.string.cancel, (dialog, which) -> dialog.dismiss())
                 .show();
     }
 

src/googleplay/java/org/tasks/analytics/Tracker.java

@@ -34,9 +34,7 @@ public class Tracker {
         tracker = analytics.newTracker(R.xml.google_analytics);
         tracker.setAppVersion(Integer.toString(BuildConfig.VERSION_CODE));
         final StandardExceptionParser standardExceptionParser = new StandardExceptionParser(context, null);
-        exceptionParser = new ExceptionParser() {
+        exceptionParser = (thread, throwable) -> {
-            @Override
-            public String getDescription(String thread, Throwable throwable) {
             StringBuilder stack = new StringBuilder()
                     .append(standardExceptionParser.getDescription(thread, throwable))
                     .append("\n")
@@ -47,7 +45,6 @@ public class Tracker {
                         .append("\n");
             }
             return stack.toString();
-            }
         };
         ExceptionReporter reporter = new ExceptionReporter(
                 tracker,

src/googleplay/java/org/tasks/billing/InventoryHelper.java

@@ -52,23 +52,18 @@ public class InventoryHelper implements IabBroadcastReceiver.IabBroadcastListene
     }
 
     private IabHelper.OnIabSetupFinishedListener getSetupListener(final IabHelper helper) {
-        return new IabHelper.OnIabSetupFinishedListener() {
+        return result -> {
-            @Override
-            public void onIabSetupFinished(IabResult result) {
             if (result.isSuccess()) {
                 helper.queryInventoryAsync(getQueryListener(helper));
             } else {
                 Timber.e("setup failed: %s", result.getMessage());
                 helper.dispose();
             }
-            }
         };
     }
 
     private IabHelper.QueryInventoryFinishedListener getQueryListener(final IabHelper helper) {
-        return new IabHelper.QueryInventoryFinishedListener() {
+        return (result, inv) -> {
-            @Override
-            public void onQueryInventoryFinished(IabResult result, Inventory inv) {
             if (result.isSuccess()) {
                 inventory = inv;
                 checkPurchase(R.string.sku_tasker, R.string.p_purchased_tasker);
@@ -80,7 +75,6 @@ public class InventoryHelper implements IabBroadcastReceiver.IabBroadcastListene
                 Timber.e("query inventory failed: %s", result.getMessage());
             }
             helper.dispose();
-            }
         };
     }
 

src/googleplay/java/org/tasks/billing/PurchaseHelper.java

@@ -66,18 +66,8 @@ public class PurchaseHelper implements IabHelper.OnIabSetupFinishedListener {
         if (activity.getString(R.string.sku_tasker).equals(sku) && isAppInstalled(activity, "org.tasks.locale")) {
             dialogBuilder.newMessageDialog(R.string.tasker_message)
                     .setCancelable(false)
-                    .setPositiveButton(R.string.buy, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(R.string.buy, (dialog, which) -> launchPurchaseFlow(activity, sku, pref, requestCode, callback))
-                        @Override
+                    .setNegativeButton(android.R.string.cancel, (dialog, which) -> callback.purchaseCompleted(false, sku))
-                        public void onClick(DialogInterface dialog, int which) {
-                            launchPurchaseFlow(activity, sku, pref, requestCode, callback);
-                        }
-                    })
-                    .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            callback.purchaseCompleted(false, sku);
-                        }
-                    })
                     .show();
             return false;
         } else {
@@ -107,15 +97,11 @@ public class PurchaseHelper implements IabHelper.OnIabSetupFinishedListener {
             }
             final IabHelper iabHelper = new IabHelper(context, context.getString(R.string.gp_key), executor);
             iabHelper.enableDebugLogging(true);
-            iabHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
+            iabHelper.startSetup(result -> {
-                @Override
-                public void onIabSetupFinished(IabResult result) {
                 if (result.isSuccess()) {
-                        iabHelper.consumeAsync(purchases, new IabHelper.OnConsumeMultiFinishedListener() {
+                    iabHelper.consumeAsync(purchases, (purchases1, results) -> {
-                            @Override
+                        for (int i = 0; i < purchases1.size() ; i++) {
-                            public void onConsumeMultiFinished(List<Purchase> purchases, List<IabResult> results) {
+                            Purchase purchase = purchases1.get(i);
-                                for (int i = 0 ; i < purchases.size() ; i++) {
-                                    Purchase purchase = purchases.get(i);
                             IabResult iabResult = results.get(i);
                             if (iabResult.isSuccess()) {
                                 if (purchase.equals(tasker)) {
@@ -137,13 +123,11 @@ public class PurchaseHelper implements IabHelper.OnIabSetupFinishedListener {
                             }
                         }
                         iabHelper.dispose();
-                            }
                     });
                 } else {
                     Timber.e("setup failed: %s", result.getMessage());
                     iabHelper.dispose();
                 }
-                }
             });
         }
     }
@@ -157,32 +141,27 @@ public class PurchaseHelper implements IabHelper.OnIabSetupFinishedListener {
         iabHelper = new IabHelper(context, context.getString(R.string.gp_key), executor);
         iabHelper.enableDebugLogging(BuildConfig.DEBUG);
         Timber.d("%s: startSetup", iabHelper);
-        iabHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
+        iabHelper.startSetup(result -> {
-            @Override
-            public void onIabSetupFinished(IabResult result) {
             if (result.isSuccess()) {
                 try {
                     Timber.d("%s: launchPurchaseFlow for %s", iabHelper, sku);
-                        iabHelper.launchPurchaseFlow(activity, sku, requestCode, new IabHelper.OnIabPurchaseFinishedListener() {
+                    iabHelper.launchPurchaseFlow(activity, sku, requestCode, (result1, info) -> {
-                            @Override
+                        Timber.d(result1.toString());
-                            public void onIabPurchaseFinished(IabResult result, Purchase info) {
+                        tracker.reportIabResult(result1, sku);
-                                Timber.d(result.toString());
+                        if (result1.isSuccess()) {
-                                tracker.reportIabResult(result, sku);
-                                if (result.isSuccess()) {
                             if (!Strings.isNullOrEmpty(pref)) {
                                 preferences.setBoolean(pref, true);
                                 broadcaster.refresh();
                             }
                             inventory.refreshInventory();
-                                } else if (result.getResponse() != IabHelper.BILLING_RESPONSE_RESULT_USER_CANCELED &&
+                        } else if (result1.getResponse() != IabHelper.BILLING_RESPONSE_RESULT_USER_CANCELED &&
-                                        result.getResponse() != IabHelper.IABHELPER_USER_CANCELLED) {
+                                result1.getResponse() != IabHelper.IABHELPER_USER_CANCELLED) {
-                                    Toast.makeText(activity, result.getMessage(), Toast.LENGTH_LONG).show();
+                            Toast.makeText(activity, result1.getMessage(), Toast.LENGTH_LONG).show();
                         }
                         if (activityResultCallback != null) {
-                                    activityResultCallback.purchaseCompleted(result.isSuccess(), sku);
+                            activityResultCallback.purchaseCompleted(result1.isSuccess(), sku);
                         }
                         disposeIabHelper();
-                            }
                     });
                 } catch (IllegalStateException e) {
                     tracker.reportException(e);
@@ -196,7 +175,6 @@ public class PurchaseHelper implements IabHelper.OnIabSetupFinishedListener {
                 callback.purchaseCompleted(false, sku);
                 disposeIabHelper();
             }
-            }
         });
     }
 

src/googleplay/java/org/tasks/dashclock/DashClockSettings.java

@@ -44,14 +44,11 @@ public class DashClockSettings extends InjectingPreferenceActivity implements Pu
 
         addPreferencesFromResource(R.xml.preferences_dashclock);
 
-        findPreference(getString(R.string.p_dashclock_filter)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.p_dashclock_filter)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(DashClockSettings.this, FilterSelectionActivity.class) {{
                 putExtra(FilterSelectionActivity.EXTRA_RETURN_FILTER, true);
             }}, REQUEST_SELECT_FILTER);
             return false;
-            }
         });
 
         refreshPreferences();

src/googleplay/java/org/tasks/dialogs/AccountSelectionDialog.java

@@ -39,20 +39,14 @@ public class AccountSelectionDialog extends InjectingDialogFragment {
 
         return dialogBuilder.newDialog()
                 .setTitle(R.string.choose_google_account)
-                .setItems(accounts, new DialogInterface.OnClickListener() {
+                .setItems(accounts, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     handler.accountSelected(accounts.get(which));
                     dialog.dismiss();
-                    }
                 })
-                .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
+                .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     if (handler != null) {
                         handler.onCancel();
                     }
-                    }
                 })
                 .show();
     }

src/googleplay/java/org/tasks/gtasks/GoogleTaskSyncAdapter.java

@@ -409,9 +409,7 @@ public class GoogleTaskSyncAdapter extends InjectingAbstractThreadedSyncAdapter
             newMetadataValues.add(metadatum.getMergedValues());
         }
 
-        metadataDao.byTaskAndKey(taskId, metadataKey, new Callback<Metadata>() {
+        metadataDao.byTaskAndKey(taskId, metadataKey, item -> {
-            @Override
-            public void apply(Metadata item) {
             long id = item.getId();
 
             // clear item id when matching with incoming values
@@ -423,7 +421,6 @@ public class GoogleTaskSyncAdapter extends InjectingAbstractThreadedSyncAdapter
                 // not matched. cut it
                 metadataDao.delete(id);
             }
-            }
         });
 
         // everything that remains shall be written

src/googleplay/java/org/tasks/locale/ui/activity/TaskerSettingsActivity.java

@@ -66,28 +66,17 @@ public final class TaskerSettingsActivity extends AbstractFragmentPluginAppCompa
 
         toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_close_24dp));
         toolbar.setOnMenuItemClickListener(this);
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(view -> {
-            @Override
-            public void onClick(View view) {
             if (equalBundles(getResultBundle(), previousBundle)) {
                 cancel();
             } else {
                 dialogBuilder.newMessageDialog(R.string.discard_changes)
-                            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                        .setPositiveButton(android.R.string.ok, (dialog, which) -> cancel())
-                                @Override
+                        .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
-                                public void onClick(DialogInterface dialog, int which) {
-                                    cancel();
-                                }
-                            })
-                            .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                                @Override
-                                public void onClick(DialogInterface dialog, int which) {
 
-                                }
                         })
                         .show();
             }
-            }
         });
         toolbar.inflateMenu(R.menu.tasker_menu);
         MenuColorizer.colorToolbar(this, toolbar);

src/googleplay/java/org/tasks/location/GeofenceApi.java

@@ -48,18 +48,14 @@ public class GeofenceApi {
             return;
         }
 
-        newClient(new GoogleApi.GoogleApiClientConnectionHandler() {
+        newClient(client -> {
-            @Override
-            public void onConnect(final GoogleApiClient client) {
             @SuppressWarnings("ResourceType")
             @SuppressLint("MissingPermission")
             PendingResult<Status> result = LocationServices.GeofencingApi.addGeofences(
                     client,
                     getRequests(geofences),
                     PendingIntent.getService(context, 0, new Intent(context, GeofenceTransitionsIntentService.class), PendingIntent.FLAG_UPDATE_CURRENT));
-                result.setResultCallback(new ResultCallback<Status>() {
+            result.setResultCallback(status -> {
-                    @Override
-                    public void onResult(Status status) {
                 if (status.isSuccess()) {
                     Timber.i("Registered %s", geofences);
                 } else {
@@ -67,9 +63,7 @@ public class GeofenceApi {
                 }
 
                 client.disconnect();
-                    }
             });
-            }
         });
     }
 
@@ -82,20 +76,10 @@ public class GeofenceApi {
             return;
         }
 
-        final List<String> ids = newArrayList(transform(geofences, new Function<Geofence, String>() {
+        final List<String> ids = newArrayList(transform(geofences, geofence -> Long.toString(geofence.getMetadataId())));
-            @Override
-            public String apply(Geofence geofence) {
-                return Long.toString(geofence.getMetadataId());
-            }
-        }));
 
-        newClient(new GoogleApi.GoogleApiClientConnectionHandler() {
+        newClient(client -> LocationServices.GeofencingApi.removeGeofences(client, ids)
-            @Override
+                .setResultCallback(status -> {
-            public void onConnect(final GoogleApiClient client) {
-                LocationServices.GeofencingApi.removeGeofences(client, ids)
-                        .setResultCallback(new ResultCallback<Status>() {
-                            @Override
-                            public void onResult(Status status) {
                     if (status.isSuccess()) {
                         Timber.i("Removed %s", geofences);
                     } else {
@@ -103,10 +87,7 @@ public class GeofenceApi {
                     }
 
                     client.disconnect();
-                            }
+                }));
-                        });
-            }
-        });
     }
 
     private void newClient(final GoogleApi.GoogleApiClientConnectionHandler handler) {
@@ -114,12 +95,7 @@ public class GeofenceApi {
     }
 
     private List<com.google.android.gms.location.Geofence> getRequests(List<Geofence> geofences) {
-        return newArrayList(transform(geofences, new Function<Geofence, com.google.android.gms.location.Geofence>() {
+        return newArrayList(transform(geofences, this::toGoogleGeofence));
-            @Override
-            public com.google.android.gms.location.Geofence apply(Geofence geofence) {
-                return toGoogleGeofence(geofence);
-            }
-        }));
     }
 
     private com.google.android.gms.location.Geofence toGoogleGeofence(Geofence geofence) {

src/googleplay/java/org/tasks/location/GoogleApi.java

@@ -33,12 +33,7 @@ public class GoogleApi implements GoogleApiClient.ConnectionCallbacks {
     }
 
     public void connect(final GoogleApiClientConnectionHandler googleApiClientConnectionHandler) {
-        connect(googleApiClientConnectionHandler, new GoogleApiClient.OnConnectionFailedListener() {
+        connect(googleApiClientConnectionHandler, connectionResult -> Timber.e("onConnectionFailed(%s)", connectionResult));
-            @Override
-            public void onConnectionFailed(ConnectionResult connectionResult) {
-                Timber.e("onConnectionFailed(%s)", connectionResult);
-            }
-        });
     }
 
     private void connect(final GoogleApiClientConnectionHandler googleApiClientConnectionHandler, GoogleApiClient.OnConnectionFailedListener onConnectionFailedListener) {

src/main/java/com/todoroo/andlib/data/DatabaseDao.java

@@ -54,12 +54,7 @@ public class DatabaseDao<TYPE extends AbstractModel> {
 
     public List<TYPE> toList(Query query) {
         final List<TYPE> result = new ArrayList<>();
-        query(new Callback<TYPE>() {
+        query(result::add, query);
-            @Override
-            public void apply(TYPE entry) {
-                result.add(entry);
-            }
-        }, query);
         return result;
     }
 

src/main/java/com/todoroo/andlib/utility/AndroidUtilities.java

@@ -47,13 +47,10 @@ public class AndroidUtilities {
     public static void suppressVirtualKeyboard(final TextView editor) {
         final int inputType = editor.getInputType();
         editor.setInputType(InputType.TYPE_NULL);
-        editor.setOnTouchListener(new OnTouchListener() {
+        editor.setOnTouchListener((v, event) -> {
-            @Override
-            public boolean onTouch(View v, MotionEvent event) {
             editor.setInputType(inputType);
             editor.setOnTouchListener(null);
             return false;
-            }
         });
     }
 
@@ -178,9 +175,7 @@ public class AndroidUtilities {
         }
 
         ContentValues result = new ContentValues();
-        fromSerialized(string, result, new SerializedPut<ContentValues>() {
+        fromSerialized(string, result, (object, key, type, value) -> {
-            @Override
-            public void put(ContentValues object, String key, char type, String value) throws NumberFormatException {
             switch(type) {
             case 'i':
                 object.put(key, Integer.parseInt(value));
@@ -198,7 +193,6 @@ public class AndroidUtilities {
                 object.put(key, Boolean.parseBoolean(value));
                 break;
             }
-            }
         });
         return result;
     }
@@ -212,9 +206,7 @@ public class AndroidUtilities {
         }
 
         Bundle result = new Bundle();
-        fromSerialized(string, result, new SerializedPut<Bundle>() {
+        fromSerialized(string, result, (object, key, type, value) -> {
-            @Override
-            public void put(Bundle object, String key, char type, String value) throws NumberFormatException {
             switch(type) {
             case 'i':
                 object.putInt(key, Integer.parseInt(value));
@@ -232,7 +224,6 @@ public class AndroidUtilities {
                 object.putBoolean(key, Boolean.parseBoolean(value));
                 break;
             }
-            }
         });
         return result;
     }
@@ -328,12 +319,7 @@ public class AndroidUtilities {
      * Sort files by date so the newest file is on top
      */
     public static void sortFilesByDateDesc(File[] files) {
-        Arrays.sort(files, new Comparator<File>() {
+        Arrays.sort(files, (o1, o2) -> Long.valueOf(o2.lastModified()).compareTo(o1.lastModified()));
-            @Override
-            public int compare(File o1, File o2) {
-                return Long.valueOf(o2.lastModified()).compareTo(o1.lastModified());
-            }
-        });
     }
 
     /**

src/main/java/com/todoroo/andlib/utility/DialogUtilities.java

@@ -21,15 +21,12 @@ public class DialogUtilities {
         if(dialog == null) {
             return;
         }
-        activity.runOnUiThread(new Runnable() {
+        activity.runOnUiThread(() -> {
-            @Override
-            public void run() {
             try {
                 dialog.dismiss();
             } catch(Exception e) {
                 Timber.e(e, e.getMessage());
             }
-            }
         });
     }
 }

src/main/java/com/todoroo/astrid/actfm/FilterSettingsActivity.java

@@ -61,15 +61,12 @@ public class FilterSettingsActivity extends ThemedInjectingAppCompatActivity imp
         toolbar.setNavigationIcon(getResources().getDrawable(
                 backButtonSavesTask ? R.drawable.ic_close_24dp : R.drawable.ic_save_24dp));
         toolbar.setTitle(filter.listingTitle);
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             if (backButtonSavesTask) {
                 discard();
             } else {
                 save();
             }
-            }
         });
         toolbar.inflateMenu(R.menu.tag_settings_activity);
         toolbar.setOnMenuItemClickListener(this);
@@ -120,13 +117,10 @@ public class FilterSettingsActivity extends ThemedInjectingAppCompatActivity imp
 
     private void deleteTag() {
         dialogBuilder.newMessageDialog(R.string.delete_tag_confirmation, filter.listingTitle)
-                .setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
+                .setPositiveButton(R.string.delete, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     storeObjectDao.delete(filter.getId());
                     setResult(RESULT_OK, new Intent(AstridApiConstants.BROADCAST_EVENT_FILTER_DELETED).putExtra(TOKEN_FILTER, filter));
                     finish();
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
@@ -138,12 +132,7 @@ public class FilterSettingsActivity extends ThemedInjectingAppCompatActivity imp
             finish();
         } else {
             dialogBuilder.newMessageDialog(R.string.discard_changes)
-                    .setPositiveButton(R.string.discard, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(R.string.discard, (dialog, which) -> finish())
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            finish();
-                        }
-                    })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();
         }

src/main/java/com/todoroo/astrid/actfm/TagSettingsActivity.java

@@ -100,15 +100,12 @@ public class TagSettingsActivity extends ThemedInjectingAppCompatActivity implem
         toolbar.setTitle(isNewTag ? getString(R.string.new_tag) : tagData.getName());
         toolbar.setNavigationIcon(getResources().getDrawable(
                 backButtonSavesTask ? R.drawable.ic_close_24dp : R.drawable.ic_save_24dp));
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             if (backButtonSavesTask) {
                 discard();
             } else {
                 save();
             }
-            }
         });
         toolbar.inflateMenu(R.menu.tag_settings_activity);
         toolbar.setOnMenuItemClickListener(this);
@@ -237,9 +234,7 @@ public class TagSettingsActivity extends ThemedInjectingAppCompatActivity implem
 
     private void deleteTag() {
         dialogBuilder.newMessageDialog(R.string.delete_tag_confirmation, tagData.getName())
-                .setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
+                .setPositiveButton(R.string.delete, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     if (tagData != null) {
                         String uuid = tagData.getUuid();
                         metadataDao.deleteWhere(Criterion.and(MetadataDao.MetadataCriteria.withKey(TaskToTagMetadata.KEY), TaskToTagMetadata.TAG_UUID.eq(uuid)));
@@ -247,7 +242,6 @@ public class TagSettingsActivity extends ThemedInjectingAppCompatActivity implem
                         setResult(RESULT_OK, new Intent(AstridApiConstants.BROADCAST_EVENT_TAG_DELETED).putExtra(EXTRA_TAG_UUID, uuid));
                     }
                     finish();
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
@@ -258,12 +252,7 @@ public class TagSettingsActivity extends ThemedInjectingAppCompatActivity implem
             finish();
         } else {
             dialogBuilder.newMessageDialog(R.string.discard_changes)
-                    .setPositiveButton(R.string.discard, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(R.string.discard, (dialog, which) -> finish())
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            finish();
-                        }
-                    })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();
         }

src/main/java/com/todoroo/astrid/activity/BeastModePreferences.java

@@ -65,12 +65,7 @@ public class BeastModePreferences extends ThemedInjectingAppCompatActivity imple
         ButterKnife.bind(this);
 
         toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_arrow_back_24dp));
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
         toolbar.inflateMenu(R.menu.beast_mode);
         toolbar.setOnMenuItemClickListener(this);
         MenuColorizer.colorToolbar(this, toolbar);
@@ -90,19 +85,11 @@ public class BeastModePreferences extends ThemedInjectingAppCompatActivity imple
             }
         };
         touchList.setAdapter(adapter);
-        touchList.setOnTouchListener(new OnTouchListener() {
+        touchList.setOnTouchListener((v, event) -> false);
-            @Override
+        touchList.setDropListener((from, to) -> {
-            public boolean onTouch(View v, MotionEvent event) {
-                return false;
-            }
-        });
-        touchList.setDropListener(new DropListener() {
-            @Override
-            public void drop(int from, int to) {
             String s = items.remove(from);
             items.add(to, s);
             adapter.notifyDataSetChanged();
-            }
         });
     }
 

src/main/java/com/todoroo/astrid/activity/TaskEditFragment.java

@@ -127,15 +127,12 @@ public final class TaskEditFragment extends InjectingFragment implements Toolbar
         final boolean backButtonSavesTask = preferences.backButtonSavesTask();
         toolbar.setNavigationIcon(getResources().getDrawable(
                 backButtonSavesTask ? R.drawable.ic_close_24dp : R.drawable.ic_save_24dp));
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             if (backButtonSavesTask) {
                 discardButtonClick();
             } else {
                 save();
             }
-            }
         });
         toolbar.inflateMenu(R.menu.task_edit_fragment);
         toolbar.setOnMenuItemClickListener(this);
@@ -274,12 +271,7 @@ public final class TaskEditFragment extends InjectingFragment implements Toolbar
         if (hasChanges(taskEditControlSetFragmentManager.getFragmentsInPersistOrder(getChildFragmentManager()))) {
             dialogBuilder.newMessageDialog(R.string.discard_confirmation)
                     .setPositiveButton(R.string.keep_editing, null)
-                    .setNegativeButton(R.string.discard, new DialogInterface.OnClickListener() {
+                    .setNegativeButton(R.string.discard, (dialog, which) -> discard())
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            discard();
-                        }
-                    })
                     .show();
         } else {
             discard();
@@ -297,13 +289,10 @@ public final class TaskEditFragment extends InjectingFragment implements Toolbar
 
     protected void deleteButtonClick() {
         dialogBuilder.newMessageDialog(R.string.DLG_delete_this_task_question)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     TimerPlugin.stopTimer(notificationManager, taskService, getActivity(), model);
                     taskDeleter.delete(model);
                     callback.taskEditFinished();
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();

src/main/java/com/todoroo/astrid/activity/TaskListActivity.java

@@ -225,14 +225,9 @@ public class TaskListActivity extends InjectingAppCompatActivity implements
         if (syncAdapterHelper.shouldShowBackgroundSyncWarning() && !preferences.getBoolean(R.string.p_sync_warning_shown, false)) {
             if (taskListFragment != null) {
                 taskListFragment.makeSnackbar(R.string.master_sync_warning)
-                        .setAction(R.string.TLA_menu_settings, new View.OnClickListener() {
+                        .setAction(R.string.TLA_menu_settings, view -> startActivity(new Intent(Settings.ACTION_SYNC_SETTINGS) {{
-                            @Override
-                            public void onClick(View view) {
-                                startActivity(new Intent(Settings.ACTION_SYNC_SETTINGS) {{
                             setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                                }});
+                        }}))
-                            }
-                        })
                         .setCallback(new Snackbar.Callback() {
                             @Override
                             public void onShown(Snackbar snackbar) {

src/main/java/com/todoroo/astrid/activity/TaskListFragment.java

@@ -175,12 +175,9 @@ public class TaskListFragment extends InjectingListFragment implements
     public void setSyncOngoing(final boolean ongoing) {
         Activity activity = getActivity();
         if (activity != null) {
-            activity.runOnUiThread(new Runnable() {
+            activity.runOnUiThread(() -> {
-                @Override
-                public void run() {
                 swipeRefreshLayout.setRefreshing(ongoing);
                 emptyView.setRefreshing(ongoing);
-                }
             });
         }
     }
@@ -252,12 +249,7 @@ public class TaskListFragment extends InjectingListFragment implements
 
         toolbar.setTitle(filter.listingTitle);
         toolbar.setNavigationIcon(R.drawable.ic_menu_24dp);
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> callbacks.onNavigationIconClicked());
-            @Override
-            public void onClick(View v) {
-                callbacks.onNavigationIconClicked();
-            }
-        });
         inflateMenu(toolbar);
         setupMenu(toolbar.getMenu());
         toolbar.setOnMenuItemClickListener(this);
@@ -390,9 +382,7 @@ public class TaskListFragment extends InjectingListFragment implements
         registerForContextMenu(listView);
 
         // set listener for quick-changing task priority
-        listView.setOnKeyListener(new OnKeyListener() {
+        listView.setOnKeyListener((view, keyCode, event) -> {
-            @Override
-            public boolean onKey(View view, int keyCode, KeyEvent event) {
             if (event.getAction() != KeyEvent.ACTION_UP || view == null) {
                 return false;
             }
@@ -422,7 +412,6 @@ public class TaskListFragment extends InjectingListFragment implements
             }
 
             return false;
-            }
         });
         filter.setFilterQueryOverride(null);
 
@@ -440,10 +429,7 @@ public class TaskListFragment extends InjectingListFragment implements
             return;
         }
 
-        listView.setOnItemClickListener(new OnItemClickListener() {
+        listView.setOnItemClickListener((parent, view, position, id) -> {
-            @Override
-            public void onItemClick(AdapterView<?> parent, View view,
-                                    int position, long id) {
             if (taskAdapter != null) {
                 TodorooCursor<Task> cursor = (TodorooCursor<Task>) taskAdapter.getItem(position);
                 Task task = new Task(cursor);
@@ -453,7 +439,6 @@ public class TaskListFragment extends InjectingListFragment implements
 
                 onTaskListItemClicked(id);
             }
-            }
         });
     }
 
@@ -541,10 +526,7 @@ public class TaskListFragment extends InjectingListFragment implements
     protected TaskAdapter createTaskAdapter(TodorooCursor<Task> cursor) {
 
         return new TaskAdapter(context, preferences, taskAttachmentDao, taskService, this, cursor, sqlQueryTemplate,
-                new OnCompletedTaskListener() {
+                (item, newState) -> {
-                    @Override
-                    public void onCompletedTask(Task item, boolean newState) {
-                    }
                 }, dialogBuilder, checkBoxes, tagService, themeCache);
     }
 
@@ -657,13 +639,10 @@ public class TaskListFragment extends InjectingListFragment implements
     /** Show a dialog box and delete the task specified */
     private void deleteTask(final Task task) {
         dialogBuilder.newMessageDialog(R.string.delete_tag_confirmation, task.getTitle())
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     onTaskDelete(task);
                     taskDeleter.delete(task);
                     loadTaskListContent();
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
@@ -695,15 +674,12 @@ public class TaskListFragment extends InjectingListFragment implements
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == VOICE_RECOGNITION_REQUEST_CODE) {
             if (resultCode == Activity.RESULT_OK) {
-                Callback<String> quickAddTask = new Callback<String>() {
+                Callback<String> quickAddTask = title -> {
-                    @Override
-                    public void apply(String title) {
                     Task task = addTask(title);
                     taskCreator.addToCalendar(task);
                     onTaskListItemClicked(task.getId());
                     loadTaskListContent();
                     onTaskCreated(task.getId(), task.getUUID());
-                    }
                 };
                 voiceInputAssistant.handleActivityResult(data, quickAddTask);
             }

src/main/java/com/todoroo/astrid/adapter/FilterAdapter.java

@@ -95,21 +95,11 @@ public class FilterAdapter extends ArrayAdapter<FilterListItem> {
 
     @Override
     public void notifyDataSetChanged() {
-        activity.runOnUiThread(new Runnable() {
+        activity.runOnUiThread(FilterAdapter.super::notifyDataSetChanged);
-            @Override
-            public void run() {
-                FilterAdapter.super.notifyDataSetChanged();
-            }
-        });
     }
 
     public void refreshFilterCount() {
-        filterCounter.refreshFilterCounts(new Runnable() {
+        filterCounter.refreshFilterCounts(this::notifyDataSetChanged);
-            @Override
-            public void run() {
-                notifyDataSetChanged();
-            }
-        });
     }
 
     /**
@@ -286,12 +276,7 @@ public class FilterAdapter extends ArrayAdapter<FilterListItem> {
 
         notifyDataSetChanged();
 
-        filterCounter.refreshFilterCounts(new Runnable() {
+        filterCounter.refreshFilterCounts(this::notifyDataSetChanged);
-            @Override
-            public void run() {
-                notifyDataSetChanged();
-            }
-        });
     }
 
     /**

src/main/java/com/todoroo/astrid/adapter/TaskAdapter.java

@@ -369,20 +369,15 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
         final ViewHolder viewHolder = (ViewHolder)container.getTag();
 
         // check box listener
-        OnTouchListener otl = new OnTouchListener() {
+        OnTouchListener otl = (v, event) -> {
-            @Override
-            public boolean onTouch(View v, MotionEvent event) {
             lastTouchYRawY = new Pair<>(event.getY(), event.getRawY());
             return false;
-            }
         };
         viewHolder.completeBox.setOnTouchListener(otl);
         viewHolder.completeBox.setOnClickListener(completeBoxListener);
 
         if (viewHolder.taskActionContainer != null) {
-            viewHolder.taskActionContainer.setOnClickListener(new OnClickListener() {
+            viewHolder.taskActionContainer.setOnClickListener(v -> {
-                @Override
-                public void onClick(View v) {
                 TaskAction action = (TaskAction) viewHolder.taskActionIcon.getTag();
                 if (action instanceof NotesAction) {
                     showEditNotesDialog(viewHolder.task);
@@ -396,7 +391,6 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
                         Timber.e(e, e.getMessage());
                     }
                 }
-                }
             });
         }
     }
@@ -443,9 +437,7 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
         }
     }
 
-    protected final View.OnClickListener completeBoxListener = new View.OnClickListener() {
+    protected final View.OnClickListener completeBoxListener = v -> {
-        @Override
-        public void onClick(View v) {
         int[] location = new int[2];
         v.getLocationOnScreen(location);
         ViewHolder viewHolder = getTagFromCheckBox(v);
@@ -461,7 +453,6 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
 
         // set check box to actual action item state
         setTaskAppearance(viewHolder, task);
-        }
     };
 
     private ViewHolder getTagFromCheckBox(View v) {
@@ -512,12 +503,7 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
         checkBoxView.invalidate();
     }
 
-    private final Function<String, TagData> uuidToTag = new Function<String, TagData>() {
+    private final Function<String, TagData> uuidToTag = tagMap::get;
-        @Override
-        public TagData apply(String input) {
-            return tagMap.get(input);
-        }
-    };
 
     private final Ordering<TagData> orderByName = new Ordering<TagData>() {
         @Override
@@ -542,9 +528,7 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
     };
 
     private Function<TagData, SpannableString> tagToString(final float maxLength) {
-        return new Function<TagData, SpannableString>() {
+        return tagData -> {
-            @Override
-            public SpannableString apply(TagData tagData) {
             String tagName = tagData.getName();
             tagName = tagName.substring(0, Math.min(tagName.length(), (int) maxLength));
             SpannableString string = new SpannableString(SPACE + tagName + SPACE);
@@ -553,7 +537,6 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
             string.setSpan(new BackgroundColorSpan(color.getPrimaryColor()), 0, string.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
             string.setSpan(new ForegroundColorSpan(color.getActionBarTint()), 0, string.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
             return string;
-            }
         };
     }
 
@@ -648,12 +631,9 @@ public class TaskAdapter extends CursorAdapter implements Filterable {
             this.onCompletedTaskListener = newListener;
         } else {
             final OnCompletedTaskListener old = this.onCompletedTaskListener;
-            this.onCompletedTaskListener = new OnCompletedTaskListener() {
+            this.onCompletedTaskListener = (item, newState) -> {
-                @Override
-                public void onCompletedTask(Task item, boolean newState) {
                 old.onCompletedTask(item, newState);
                 newListener.onCompletedTask(item, newState);
-                }
             };
         }
     }

src/main/java/com/todoroo/astrid/alarms/AlarmService.java

@@ -79,13 +79,10 @@ public class AlarmService {
             metadata.add(item);
         }
 
-        boolean changed = synchronizeMetadata(taskId, metadata, new SynchronizeMetadataCallback() {
+        boolean changed = synchronizeMetadata(taskId, metadata, m -> {
-            @Override
-            public void beforeDeleteMetadata(Metadata m) {
             // Cancel the alarm before the metadata is deleted
             PendingIntent pendingIntent = pendingIntentForAlarm(m, taskId);
             alarmManager.cancel(pendingIntent);
-            }
         });
 
         if(changed) {
@@ -113,24 +110,14 @@ public class AlarmService {
      * Schedules all alarms
      */
     public void scheduleAllAlarms() {
-        getActiveAlarms(new Callback<Metadata>() {
+        getActiveAlarms(this::scheduleAlarm);
-            @Override
-            public void apply(Metadata alarm) {
-                scheduleAlarm(alarm);
-            }
-        });
     }
 
     /**
      * Schedules alarms for a single task
      */
     private void scheduleAlarms(long taskId) {
-        getActiveAlarmsForTask(taskId, new Callback<Metadata>() {
+        getActiveAlarmsForTask(taskId, this::scheduleAlarm);
-            @Override
-            public void apply(Metadata alarm) {
-                scheduleAlarm(alarm);
-            }
-        });
     }
 
     private PendingIntent pendingIntentForAlarm(Metadata alarm, long taskId) {
@@ -181,9 +168,7 @@ public class AlarmService {
             newMetadataValues.add(values);
         }
 
-        metadataDao.byTaskAndKey(taskId, AlarmFields.METADATA_KEY, new Callback<Metadata>() {
+        metadataDao.byTaskAndKey(taskId, AlarmFields.METADATA_KEY, item -> {
-            @Override
-            public void apply(Metadata item) {
             long id = item.getId();
 
             // clear item id when matching with incoming values
@@ -202,7 +187,6 @@ public class AlarmService {
                 metadataDao.delete(id);
                 dirty[0] = true;
             }
-            }
         });
 
         // everything that remains shall be written

src/main/java/com/todoroo/astrid/alarms/AlarmTaskRepeatListener.java

@@ -43,12 +43,7 @@ public class AlarmTaskRepeatListener extends InjectingBroadcastReceiver {
         }
 
         final Set<Long> alarms = new LinkedHashSet<>();
-        alarmService.getAlarms(taskId, new Callback<Metadata>() {
+        alarmService.getAlarms(taskId, metadata -> alarms.add(metadata.getValue(AlarmFields.TIME) + (newDueDate - oldDueDate)));
-            @Override
-            public void apply(Metadata metadata) {
-                alarms.add(metadata.getValue(AlarmFields.TIME) + (newDueDate - oldDueDate));
-            }
-        });
         if (!alarms.isEmpty()) {
             alarmService.synchronizeAlarms(taskId, alarms);
         }

src/main/java/com/todoroo/astrid/backup/TasksXmlExporter.java

@@ -79,12 +79,9 @@ public class TasksXmlExporter {
     }
 
     private void setProgress(final int taskNumber, final int total) {
-        post(new Runnable() {
+        post(() -> {
-            @Override
-            public void run() {
             progressDialog.setMax(total);
             progressDialog.setProgress(taskNumber);
-            }
         });
     }
 
@@ -109,9 +106,7 @@ public class TasksXmlExporter {
             this.progressDialog = new ProgressDialog(context);
         }
 
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             try {
                 String output = setupFile(backupDirectory,
                         exportType);
@@ -129,16 +124,12 @@ public class TasksXmlExporter {
             } catch (IOException e) {
                 Timber.e(e, e.getMessage());
             } finally {
-                    post(new Runnable() {
+                post(() -> {
-                        @Override
-                        public void run() {
                     if(progressDialog.isShowing() && context instanceof Activity) {
                         DialogUtilities.dismissDialog((Activity) context, progressDialog);
                     }
-                        }
                 });
             }
-            }
         }).start();
     }
 
@@ -169,9 +160,7 @@ public class TasksXmlExporter {
     }
 
     private void serializeTagDatas() {
-        tagDataDao.allTags(new Callback<TagData>() {
+        tagDataDao.allTags(tag -> {
-            @Override
-            public void apply(TagData tag) {
             try {
                 xml.startTag(null, BackupConstants.TAGDATA_TAG);
                 serializeModel(tag, TagData.PROPERTIES, TagData.ID);
@@ -179,7 +168,6 @@ public class TasksXmlExporter {
             } catch(IOException e) {
                 throw new RuntimeException(e);
             }
-            }
         });
     }
 
@@ -207,9 +195,7 @@ public class TasksXmlExporter {
     }
 
     private synchronized void serializeMetadata(Task task) {
-        metadataDao.byTask(task.getId(), new Callback<Metadata>() {
+        metadataDao.byTask(task.getId(), metadata -> {
-            @Override
-            public void apply(Metadata metadata) {
             try {
                 xml.startTag(null, BackupConstants.METADATA_TAG);
                 serializeModel(metadata, Metadata.PROPERTIES, Metadata.ID, Metadata.TASK);
@@ -217,7 +203,6 @@ public class TasksXmlExporter {
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-            }
         });
     }
 
@@ -308,9 +293,7 @@ public class TasksXmlExporter {
     }
 
     private void onFinishExport(final String outputFile) {
-        post(new Runnable() {
+        post(() -> {
-            @Override
-            public void run() {
             if(exportCount == 0) {
                 Toast.makeText(context, context.getString(R.string.export_toast_no_tasks), Toast.LENGTH_LONG).show();
             } else {
@@ -319,7 +302,6 @@ public class TasksXmlExporter {
                                 exportCount), outputFile);
                 Toast.makeText(context, text, Toast.LENGTH_LONG).show();
             }
-            }
         });
     }
 

src/main/java/com/todoroo/astrid/backup/TasksXmlImporter.java

@@ -59,12 +59,7 @@ public class TasksXmlImporter {
     private String input;
 
     private void setProgressMessage(final String message) {
-        handler.post(new Runnable() {
+        handler.post(() -> progressDialog.setMessage(message));
-            @Override
-            public void run() {
-                progressDialog.setMessage(message);
-            }
-        });
     }
 
     @Inject
@@ -83,15 +78,12 @@ public class TasksXmlImporter {
 
         handler = new Handler();
 
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             try {
                 performImport();
             } catch (IOException | XmlPullParserException e) {
                 Timber.e(e, e.getMessage());
             }
-            }
         }).start();
     }
 
@@ -126,14 +118,11 @@ public class TasksXmlImporter {
         } finally {
             Intent broadcastIntent = new Intent(AstridApiConstants.BROADCAST_EVENT_REFRESH);
             activity.sendBroadcast(broadcastIntent, AstridApiConstants.PERMISSION_READ);
-            handler.post(new Runnable() {
+            handler.post(() -> {
-                @Override
-                public void run() {
                 if(progressDialog.isShowing()) {
                     DialogUtilities.dismissDialog(activity, progressDialog);
                     showSummary();
                 }
-                }
             });
         }
     }
@@ -148,12 +137,7 @@ public class TasksXmlImporter {
                         r.getQuantityString(R.plurals.Ntasks, importCount, importCount),
                         r.getQuantityString(R.plurals.Ntasks, skipCount, skipCount),
                         r.getQuantityString(R.plurals.Ntasks, errorCount, errorCount)))
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, id) -> dialog.dismiss())
-                    @Override
-                    public void onClick(DialogInterface dialog, int id) {
-                        dialog.dismiss();
-                    }
-                })
                 .show();
     }
 

src/main/java/com/todoroo/astrid/core/CustomFilterActivity.java

@@ -151,12 +151,7 @@ public class CustomFilterActivity extends ThemedInjectingAppCompatActivity imple
         toolbar.setTitle(R.string.FLA_new_filter);
         toolbar.inflateMenu(R.menu.menu_custom_filter_activity);
         toolbar.setOnMenuItemClickListener(this);
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(view -> discard());
-            @Override
-            public void onClick(View view) {
-                discard();
-            }
-        });
         MenuColorizer.colorToolbar(this, toolbar);
         listView = (ListView) findViewById(android.R.id.list);
 
@@ -186,17 +181,9 @@ public class CustomFilterActivity extends ThemedInjectingAppCompatActivity imple
     }
 
     private void setUpListeners() {
-        findViewById(R.id.add).setOnClickListener(new View.OnClickListener() {
+        findViewById(R.id.add).setOnClickListener(v -> listView.showContextMenu());
-            @Override
-            public void onClick(View v) {
-                listView.showContextMenu();
-            }
-        });
 
-        listView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
+        listView.setOnCreateContextMenuListener((menu, v, menuInfo) -> {
-            @Override
-            public void onCreateContextMenu(ContextMenu menu, View v,
-                    ContextMenuInfo menuInfo) {
             if(menu.hasVisibleItems()) {
                 /* If it has items already, then the user did not click on the "Add Criteria" button, but instead
                    long held on a row in the list view, which caused CustomFilterAdapter.onCreateContextMenu
@@ -210,7 +197,6 @@ public class CustomFilterActivity extends ThemedInjectingAppCompatActivity imple
                 menu.add(CustomFilterActivity.MENU_GROUP_FILTER, i, 0, item.name);
                 i++;
             }
-            }
         });
     }
 
@@ -367,12 +353,7 @@ public class CustomFilterActivity extends ThemedInjectingAppCompatActivity imple
             finish();
         } else {
             dialogBuilder.newMessageDialog(R.string.discard_changes)
-                    .setPositiveButton(R.string.discard, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(R.string.discard, (dialog, which) -> finish())
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            finish();
-                        }
-                    })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();
         }
@@ -385,12 +366,9 @@ public class CustomFilterActivity extends ThemedInjectingAppCompatActivity imple
             CustomFilterCriterion criterion = filterCriteriaProvider.getAll().get(item.getItemId());
             final CriterionInstance instance = new CriterionInstance();
             instance.criterion = criterion;
-            adapter.showOptionsFor(instance, new Runnable() {
+            adapter.showOptionsFor(instance, () -> {
-                @Override
-                public void run() {
                 adapter.add(instance);
                 updateList();
-                }
             });
             return true;
         }

src/main/java/com/todoroo/astrid/core/CustomFilterAdapter.java

@@ -60,12 +60,9 @@ public class CustomFilterAdapter extends ArrayAdapter<CriterionInstance> {
                 return;
             }
 
-            showOptionsFor(viewHolder.item, new Runnable() {
+            showOptionsFor(viewHolder.item, () -> {
-                @Override
-                public void run() {
                 activity.updateList();
                 notifyDataSetInvalidated();
-                }
             });
         }
     };
@@ -110,14 +107,11 @@ public class CustomFilterAdapter extends ArrayAdapter<CriterionInstance> {
         if(item.criterion instanceof MultipleSelectCriterion) {
             MultipleSelectCriterion multiSelectCriterion = (MultipleSelectCriterion) item.criterion;
             final String[] titles = multiSelectCriterion.entryTitles;
-            DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
+            DialogInterface.OnClickListener listener = (click, which) -> {
-                @Override
-                public void onClick(DialogInterface click, int which) {
                 item.selectedIndex = which;
                 if(onComplete != null) {
                     onComplete.run();
                 }
-                }
             };
             dialog.setItems(titles, listener);
         } else if(item.criterion instanceof TextInputCriterion) {
@@ -131,14 +125,11 @@ public class CustomFilterAdapter extends ArrayAdapter<CriterionInstance> {
                     FrameLayout.LayoutParams.FILL_PARENT,
                     FrameLayout.LayoutParams.WRAP_CONTENT));
             dialog.setView(frameLayout).
-                setPositiveButton(android.R.string.ok, new OnClickListener() {
+                setPositiveButton(android.R.string.ok, (dialogInterface, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int which) {
                     item.selectedText = editText.getText().toString();
                     if(onComplete != null) {
                         onComplete.run();
                     }
-                    }
                 });
         }
 

src/main/java/com/todoroo/astrid/core/CustomFilterExposer.java

@@ -36,12 +36,7 @@ public final class CustomFilterExposer {
     }
 
     public List<Filter> getFilters() {
-        return newArrayList(transform(storeObjectDao.getSavedFilters(), new Function<StoreObject, Filter>() {
+        return newArrayList(transform(storeObjectDao.getSavedFilters(), this::load));
-            @Override
-            public Filter apply(StoreObject input) {
-                return load(input);
-            }
-        }));
     }
 
     public Filter getFilter(long id) {

src/main/java/com/todoroo/astrid/core/DefaultsPreferences.java

@@ -46,14 +46,11 @@ public class DefaultsPreferences extends InjectingPreferenceActivity {
         addPreferencesFromResource(R.xml.preferences_defaults);
 
         defaultCalendarPref = findPreference(getString(R.string.gcal_p_default));
-        defaultCalendarPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        defaultCalendarPref.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             if (permissionRequester.requestCalendarPermissions()) {
                 startCalendarSelectionActivity();
             }
             return false;
-            }
         });
         setCalendarSummary(preferences.getStringValue(R.string.gcal_p_default));
     }

src/main/java/com/todoroo/astrid/core/OldTaskPreferences.java

@@ -5,9 +5,7 @@
  */
 package com.todoroo.astrid.core;
 
-import android.content.DialogInterface;
 import android.os.Bundle;
-import android.preference.Preference;
 
 import com.todoroo.andlib.data.TodorooCursor;
 import com.todoroo.andlib.sql.Criterion;
@@ -45,61 +43,40 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
 
         addPreferencesFromResource(R.xml.preferences_oldtasks);
 
-        findPreference(getString(R.string.EPr_manage_purge_deleted)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_manage_purge_deleted)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             purgeDeletedTasks();
             return false;
-            }
         });
 
-        findPreference(getString(R.string.EPr_manage_delete_completed)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_manage_delete_completed)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             deleteCompletedTasks();
             return false;
-            }
         });
 
-        findPreference(getString(R.string.EPr_manage_delete_completed_gcal)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_manage_delete_completed_gcal)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             deleteCompletedEvents();
             return false;
-            }
         });
 
-        findPreference(getString(R.string.EPr_manage_delete_all_gcal)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_manage_delete_all_gcal)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             deleteAllCalendarEvents();
             return false;
-            }
         });
 
-        findPreference(getString(R.string.EPr_reset_preferences)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_reset_preferences)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             resetPreferences();
             return false;
-            }
         });
 
-        findPreference(getString(R.string.EPr_delete_task_data)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.EPr_delete_task_data)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             deleteTaskData();
             return false;
-            }
         });
     }
 
     private void deleteCompletedTasks() {
         dialogBuilder.newMessageDialog(R.string.EPr_manage_delete_completed_message)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
                     @Override
                     protected Integer doInBackground(Void... params) {
                         TodorooCursor<Task> cursor = taskService.query(Query.select(Task.ID, Task.CALENDAR_URI).where(
@@ -123,19 +100,14 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
                     protected int getResultResource() {
                         return R.string.EPr_manage_delete_completed_status;
                     }
-                        }.execute();
+                }.execute())
-                    }
-                })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
     }
 
     private void purgeDeletedTasks() {
         dialogBuilder.newMessageDialog(R.string.EPr_manage_purge_deleted_message)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
                     @Override
                     protected Integer doInBackground(Void... params) {
                         TodorooCursor<Task> cursor = taskService.query(Query.select(Task.ID, Task.TITLE, Task.CALENDAR_URI).where(
@@ -159,19 +131,14 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
                     protected int getResultResource() {
                         return R.string.EPr_manage_purge_deleted_status;
                     }
-                        }.execute();
+                }.execute())
-                    }
-                })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
     }
 
     private void deleteCompletedEvents() {
         dialogBuilder.newMessageDialog(R.string.EPr_manage_delete_completed_gcal_message)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
 
                     @Override
                     protected Integer doInBackground(Void... params) {
@@ -204,19 +171,14 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
                     protected int getResultResource() {
                         return R.string.EPr_manage_delete_completed_gcal_status;
                     }
-                        }.execute();
+                }.execute())
-                    }
-                })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
     }
 
     private void deleteAllCalendarEvents() {
         dialogBuilder.newMessageDialog(R.string.EPr_manage_delete_all_gcal_message)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        new ProgressDialogAsyncTask(OldTaskPreferences.this, dialogBuilder) {
                     @Override
                     protected Integer doInBackground(Void... params) {
                         int deletedEventCount = 0;
@@ -246,21 +208,16 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
                     protected int getResultResource() {
                         return R.string.EPr_manage_delete_all_gcal_status;
                     }
-                        }.execute();
+                }.execute())
-                    }
-                })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
     }
 
     private void resetPreferences() {
         dialogBuilder.newMessageDialog(R.string.EPr_reset_preferences_warning)
-                .setPositiveButton(R.string.EPr_reset_preferences, new DialogInterface.OnClickListener() {
+                .setPositiveButton(R.string.EPr_reset_preferences, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     preferences.reset();
                     System.exit(0);
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
@@ -268,12 +225,9 @@ public class OldTaskPreferences extends InjectingPreferenceActivity {
 
     private void deleteTaskData() {
         dialogBuilder.newMessageDialog(R.string.EPr_delete_task_data_warning)
-                .setPositiveButton(R.string.EPr_delete_task_data, new DialogInterface.OnClickListener() {
+                .setPositiveButton(R.string.EPr_delete_task_data, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     deleteDatabase(database.getName());
                     System.exit(0);
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();

src/main/java/com/todoroo/astrid/dao/StoreObjectDao.java

@@ -55,12 +55,7 @@ public class StoreObjectDao {
     }
 
     public List<GtasksList> getGtasksLists() {
-        return newArrayList(transform(getByType(GtasksList.TYPE), new Function<StoreObject, GtasksList>() {
+        return newArrayList(transform(getByType(GtasksList.TYPE), GtasksList::new));
-            @Override
-            public GtasksList apply(StoreObject input) {
-                return new GtasksList(input);
-            }
-        }));
     }
 
     public boolean persist(StoreObject storeObject) {

src/main/java/com/todoroo/astrid/files/FilesControlSet.java

@@ -78,12 +78,9 @@ public class FilesControlSet extends TaskEditControlFragment {
         }
 
         final List<TaskAttachment> files = new ArrayList<>();
-        taskAttachmentDao.getAttachments(taskUuid, new Callback<TaskAttachment>() {
+        taskAttachmentDao.getAttachments(taskUuid, attachment -> {
-            @Override
-            public void apply(TaskAttachment attachment) {
             files.add(attachment);
             addAttachment(attachment);
-            }
         });
         validateFiles(files);
         return view;
@@ -151,32 +148,19 @@ public class FilesControlSet extends TaskEditControlFragment {
         TextView nameView = (TextView) fileRow.findViewById(R.id.file_text);
         String name = LEFT_TO_RIGHT_MARK + taskAttachment.getName();
         nameView.setText(name);
-        nameView.setOnClickListener(new OnClickListener() {
+        nameView.setOnClickListener(v -> showFile(taskAttachment));
-            @Override
-            public void onClick(View v) {
-                showFile(taskAttachment);
-            }
-        });
         View clearFile = fileRow.findViewById(R.id.clear);
-        clearFile.setOnClickListener(new OnClickListener() {
+        clearFile.setOnClickListener(v -> dialogBuilder.newMessageDialog(R.string.premium_remove_file_confirm)
-            @Override
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> {
-            public void onClick(View v) {
-                dialogBuilder.newMessageDialog(R.string.premium_remove_file_confirm)
-                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
                     taskAttachmentDao.delete(taskAttachment.getId());
                     if (taskAttachment.containsNonNullValue(TaskAttachment.FILE_PATH)) {
                         File f = new File(taskAttachment.getFilePath());
                         f.delete();
                     }
                     attachmentContainer.removeView(fileRow);
-                            }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
-                        .show();
+                .show());
-            }
-        });
     }
 
     private void validateFiles(List<TaskAttachment> files) {
@@ -226,12 +210,7 @@ public class FilesControlSet extends TaskEditControlFragment {
         final String filePath = m.getFilePath();
 
         if (fileType.startsWith(TaskAttachment.FILE_TYPE_AUDIO)) {
-            play(m.getFilePath(), new PlaybackExceptionHandler() {
+            play(m.getFilePath(), () -> showFromIntent(filePath, fileType));
-                @Override
-                public void playbackFailed() {
-                    showFromIntent(filePath, fileType);
-                }
-            });
         } else if (fileType.startsWith(TaskAttachment.FILE_TYPE_IMAGE)) {
             try {
                 Intent intent = new Intent(Intent.ACTION_VIEW);

src/main/java/com/todoroo/astrid/gcal/CalendarAlarmReceiver.java

@@ -4,7 +4,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 
-import com.google.common.base.Predicate;
 import com.todoroo.andlib.utility.DateUtilities;
 import com.todoroo.astrid.utility.Constants;
 
@@ -104,11 +103,6 @@ public class CalendarAlarmReceiver extends InjectingBroadcastReceiver {
             return false;
         }
         final List<String> myAccounts = accountManager.getAccounts();
-        return any(attendees, new Predicate<AndroidCalendarEventAttendee>() {
+        return any(attendees, attendee -> myAccounts.contains(attendee.getEmail()));
-            @Override
-            public boolean apply(AndroidCalendarEventAttendee attendee) {
-                return myAccounts.contains(attendee.getEmail());
-            }
-        });
     }
 }

src/main/java/com/todoroo/astrid/gcal/CalendarReminderActivity.java

@@ -54,12 +54,7 @@ public class CalendarReminderActivity extends ThemedInjectingAppCompatActivity {
     private View dismissButton;
     private View ignoreSettingsButton;
 
-    private final OnClickListener dismissListener = new OnClickListener() {
+    private final OnClickListener dismissListener = v -> finish();
-        @Override
-        public void onClick(View v) {
-            finish();
-        }
-    };
 
     private final OnClickListener ignoreListener = new OnClickListener() {
         @Override
@@ -69,19 +64,11 @@ public class CalendarReminderActivity extends ThemedInjectingAppCompatActivity {
             ignorePresses++;
             if (ignorePresses == IGNORE_PROMPT_COUNT) {
                 dialogBuilder.newMessageDialog(R.string.CRA_ignore_body)
-                        .setPositiveButton(R.string.CRA_ignore_all, new DialogInterface.OnClickListener() {
+                        .setPositiveButton(R.string.CRA_ignore_all, (dialog, which) -> {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
                             preferences.setBoolean(R.string.p_calendar_reminders, false);
                             dismissListener.onClick(v);
-                            }
-                        })
-                        .setNegativeButton(R.string.CRA_ignore_this, new DialogInterface.OnClickListener() {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
-                                dismissListener.onClick(v);
-                            }
                         })
+                        .setNegativeButton(R.string.CRA_ignore_this, (dialog, which) -> dismissListener.onClick(v))
                         .show();
             } else {
                 dismissListener.onClick(v);
@@ -143,30 +130,17 @@ public class CalendarReminderActivity extends ThemedInjectingAppCompatActivity {
         ignoreButton.setOnClickListener(ignoreListener);
         dismissButton.setOnClickListener(dismissListener);
 
-        ignoreSettingsButton.setOnClickListener(new OnClickListener() {
+        ignoreSettingsButton.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent editPreferences = new Intent(CalendarReminderActivity.this, BasicPreferences.class);
             startActivity(editPreferences);
             dismissListener.onClick(v);
-            }
         });
 
         if (!fromPostpone) {
-            postponeButton.setOnClickListener(new OnClickListener() {
+            postponeButton.setOnClickListener(v -> postpone());
-                @Override
-                public void onClick(View v) {
-                    postpone();
-                }
-            });
         }
 
-        createListButton.setOnClickListener(new OnClickListener() {
+        createListButton.setOnClickListener(v -> createNewList(getString(R.string.CRA_default_list_name, eventName)));
-            @Override
-            public void onClick(View v) {
-                createNewList(getString(R.string.CRA_default_list_name, eventName));
-            }
-        });
     }
 
     private void createNewList(final String name) {

src/main/java/com/todoroo/astrid/notes/CommentsController.java

@@ -72,23 +72,11 @@ public class CommentsController {
 
         items.clear();
         commentsContainer.removeAllViews();
-        metadataDao.byTaskAndKey(task.getId(), NoteMetadata.METADATA_KEY, new Callback<Metadata>() {
+        metadataDao.byTaskAndKey(task.getId(), NoteMetadata.METADATA_KEY, metadata -> items.add(NoteOrUpdate.fromMetadata(metadata)));
-            @Override
-            public void apply(Metadata metadata) {
-                items.add(NoteOrUpdate.fromMetadata(metadata));
-            }
-        });
 
-        userActivityDao.getCommentsForTask(task.getUuid(), new Callback<UserActivity>() {
+        userActivityDao.getCommentsForTask(task.getUuid(), update -> items.add(NoteOrUpdate.fromUpdate(update)));
-            @Override
-            public void apply(UserActivity update) {
-                items.add(NoteOrUpdate.fromUpdate(update));
-            }
-        });
 
-        Collections.sort(items, new Comparator<NoteOrUpdate>() {
+        Collections.sort(items, (a, b) -> {
-            @Override
-            public int compare(NoteOrUpdate a, NoteOrUpdate b) {
             if (a.createdAt < b.createdAt) {
                 return 1;
             } else if (a.createdAt == b.createdAt) {
@@ -96,7 +84,6 @@ public class CommentsController {
             } else {
                 return -1;
             }
-            }
         });
 
         for (int i = 0; i < Math.min(items.size(), commentItems); i++) {
@@ -109,13 +96,10 @@ public class CommentsController {
             loadMore.setText(R.string.TEA_load_more);
             loadMore.setTextColor(activity.getResources().getColor(R.color.task_edit_deadline_gray));
             loadMore.setBackgroundColor(Color.alpha(0));
-            loadMore.setOnClickListener(new View.OnClickListener() {
+            loadMore.setOnClickListener(v -> {
-                @Override
-                public void onClick(View v) {
                 // Perform action on click
                 commentItems += 10;
                 reloadView();
-                }
             });
             commentsContainer.addView(loadMore);
         }
@@ -155,14 +139,9 @@ public class CommentsController {
             String path = getPathFromUri(activity, updateBitmap);
             commentPictureView.setImageBitmap(sampleBitmap(path, commentPictureView.getLayoutParams().width, commentPictureView.getLayoutParams().height));
 
-            view.setOnClickListener(new View.OnClickListener() {
+            view.setOnClickListener(v -> activity.startActivity(new Intent(Intent.ACTION_VIEW) {{
-                @Override
-                public void onClick(View v) {
-                    activity.startActivity(new Intent(Intent.ACTION_VIEW) {{
                 setDataAndType(updateBitmap, "image/*");
-                    }});
+            }}));
-                }
-            });
         } else {
             commentPictureView.setVisibility(View.GONE);
         }

src/main/java/com/todoroo/astrid/reminders/ReminderPreferences.java

@@ -72,12 +72,7 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
                 R.string.p_geofence_responsiveness);
 
         fieldMissedCalls = (CheckBoxPreference) findPreference(getString(R.string.p_field_missed_calls));
-        fieldMissedCalls.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        fieldMissedCalls.setOnPreferenceChangeListener((preference, newValue) -> newValue != null && (!(boolean) newValue || permissionRequestor.requestMissedCallPermissions()));
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
-                return newValue != null && (!(boolean) newValue || permissionRequestor.requestMissedCallPermissions());
-            }
-        });
         fieldMissedCalls.setChecked(fieldMissedCalls.isChecked() && permissionChecker.canAccessMissedCallPermissions());
 
         initializeRingtonePreference();
@@ -85,14 +80,11 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
         initializeTimePreference(getQuietStartPreference(), REQUEST_QUIET_START);
         initializeTimePreference(getQuietEndPreference(), REQUEST_QUIET_END);
 
-        findPreference(getString(R.string.p_led_color)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.p_led_color)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(ReminderPreferences.this, ColorPickerActivity.class) {{
                 putExtra(ColorPickerActivity.EXTRA_PALETTE, ColorPickerDialog.ColorPalette.LED);
             }}, REQUEST_LED_PICKER);
             return false;
-            }
         });
 
         requires(atLeastJellybean(), R.string.p_rmd_notif_actions_enabled, R.string.p_notification_priority);
@@ -104,24 +96,18 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
 
     private void rescheduleNotificationsOnChange(int... resIds) {
         for (int resId : resIds) {
-            findPreference(getString(resId)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            findPreference(getString(resId)).setOnPreferenceChangeListener((preference, newValue) -> {
-                @Override
-                public boolean onPreferenceChange(Preference preference, Object newValue) {
                 startService(new Intent(ReminderPreferences.this, ReminderSchedulerIntentService.class));
                 return true;
-                }
             });
         }
     }
 
     private void resetGeofencesOnChange(int... resIds) {
         for (int resId : resIds) {
-            findPreference(getString(resId)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            findPreference(getString(resId)).setOnPreferenceChangeListener((preference, newValue) -> {
-                @Override
-                public boolean onPreferenceChange(Preference preference, Object newValue) {
                 startService(new Intent(ReminderPreferences.this, GeofenceSchedulingIntentService.class));
                 return true;
-                }
             });
         }
     }
@@ -141,22 +127,17 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
     }
 
     private void initializeTimePreference(final TimePreference preference, final int requestCode) {
-        preference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        preference.setOnPreferenceClickListener(ignored -> {
-            @Override
-            public boolean onPreferenceClick(Preference ignored) {
             final DateTime current = new DateTime().withMillisOfDay(preference.getMillisOfDay());
             startActivityForResult(new Intent(ReminderPreferences.this, TimePickerActivity.class) {{
                 putExtra(TimePickerActivity.EXTRA_TIMESTAMP, current.getMillis());
             }}, requestCode);
             return true;
-            }
         });
     }
 
     private void initializeRingtonePreference() {
-        Preference.OnPreferenceChangeListener ringtoneChangedListener = new Preference.OnPreferenceChangeListener() {
+        Preference.OnPreferenceChangeListener ringtoneChangedListener = (preference, value) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object value) {
             if ("".equals(value)) {
                 preference.setSummary(R.string.silent);
             } else {
@@ -166,7 +147,6 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
                 preference.setSummary(ringtone == null ? "" : ringtone.getTitle(ReminderPreferences.this));
             }
             return true;
-            }
         };
 
         String ringtoneKey = getString(R.string.p_rmd_ringtone);

src/main/java/com/todoroo/astrid/repeats/RepeatControlSet.java

@@ -165,12 +165,7 @@ public class RepeatControlSet extends TaskEditControlFragment {
         for(int i = 0; i < 7; i++) {
             final int index = i;
             CheckBox checkBox = (CheckBox) daysOfWeekContainer.getChildAt(i);
-            checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            checkBox.setOnCheckedChangeListener((buttonView, isChecked1) -> RepeatControlSet.this.isChecked[index] = isChecked1);
-                @Override
-                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-                    RepeatControlSet.this.isChecked[index] = isChecked;
-                }
-            });
             int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
             checkBox.setText(dfs.getShortWeekdays()[dayOfWeek].substring(0, 1));
             daysOfWeek[i] = checkBox;
@@ -179,12 +174,7 @@ public class RepeatControlSet extends TaskEditControlFragment {
         }
 
         // set up listeners
-        value.setOnClickListener(new View.OnClickListener() {
+        value.setOnClickListener(v -> repeatValueClick());
-            @Override
-            public void onClick(View v) {
-                repeatValueClick();
-            }
-        });
 
         setRepeatValue(1);
         interval.setOnItemSelectedListener(new OnItemSelectedListener() {
@@ -316,22 +306,14 @@ public class RepeatControlSet extends TaskEditControlFragment {
     private AlertDialog buildDialog() {
         return dialogBuilder.newDialog()
                 .setView(dialogView)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog12, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     doRepeat = true;
 
                     callback.repeatChanged(doRepeat);
 
                     refreshDisplayView();
-                    }
-                })
-                .setOnCancelListener(new DialogInterface.OnCancelListener() {
-                    @Override
-                    public void onCancel(DialogInterface dialog) {
-                        refreshDisplayView();
-                    }
                 })
+                .setOnCancelListener(dialog1 -> refreshDisplayView())
                 .create();
     }
 
@@ -438,12 +420,7 @@ public class RepeatControlSet extends TaskEditControlFragment {
             dialogValue = 1;
         }
 
-        NumberPickerDialog dialog = new NumberPickerDialog(theme.getThemedDialog(getActivity()), new OnNumberPickedListener() {
+        NumberPickerDialog dialog = new NumberPickerDialog(theme.getThemedDialog(getActivity()), this::setRepeatValue, getResources().getString(R.string.repeat_interval_prompt),
-            @Override
-            public void onNumberPicked(int number) {
-                setRepeatValue(number);
-            }
-        }, getResources().getString(R.string.repeat_interval_prompt),
                 dialogValue, 1, 1, 365);
         theme.applyToContext(dialog.getContext());
         dialog.show();

src/main/java/com/todoroo/astrid/repeats/RepeatTaskCompleteListener.java

@@ -169,13 +169,7 @@ public class RepeatTaskCompleteListener extends InjectingBroadcastReceiver {
         }
     }
 
-    private static Comparator<WeekdayNum> weekdayCompare = new Comparator<WeekdayNum>() {
+    private static Comparator<WeekdayNum> weekdayCompare = (object1, object2) -> object1.wday.javaDayNum - object2.wday.javaDayNum;
-        @Override
-        public int compare(WeekdayNum object1, WeekdayNum object2) {
-            return object1.wday.javaDayNum - object2.wday.javaDayNum;
-        }
-
-    };
 
     private static WeekdayNum findNextWeekday(List<WeekdayNum> byDay, DateTime date) {
         WeekdayNum next = byDay.get(0);

src/main/java/com/todoroo/astrid/service/StartupService.java

@@ -76,11 +76,8 @@ public class StartupService {
         }
 
         // perform startup activities in a background thread
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             taskDeleter.deleteTasksWithEmptyTitles(null);
-            }
         }).start();
 
         if (lastVersion == 0) {

src/main/java/com/todoroo/astrid/subtasks/AstridOrderedListFragmentHelper.java

@@ -187,12 +187,7 @@ public class AstridOrderedListFragmentHelper<LIST> implements OrderedListFragmen
         taskAdapter = new DraggableTaskAdapter(context, preferences, fragment, cursor,
                 sqlQueryTemplate, dialogBuilder, checkBoxes, tagService, themeCache);
 
-        taskAdapter.addOnCompletedTaskListener(new OnCompletedTaskListener() {
+        taskAdapter.addOnCompletedTaskListener(this::setCompletedForItemAndSubtasks);
-            @Override
-            public void onCompletedTask(Task item, boolean newState) {
-                setCompletedForItemAndSubtasks(item, newState);
-            }
-        });
 
         return taskAdapter;
     }
@@ -238,15 +233,12 @@ public class AstridOrderedListFragmentHelper<LIST> implements OrderedListFragmen
         }
 
         final ArrayList<String> chained = new ArrayList<>();
-        updater.applyToDescendants(itemId, new AstridOrderedListUpdater.OrderedListNodeVisitor() {
+        updater.applyToDescendants(itemId, node -> {
-            @Override
-            public void visitNode(AstridOrderedListUpdater.Node node) {
             String uuid = node.uuid;
             model.setCompletionDate(completionDate);
             taskService.update(Task.UUID.eq(uuid), model);
             model.clear();
             chained.add(node.uuid);
-            }
         });
 
         if(chained.size() > 0) {

src/main/java/com/todoroo/astrid/subtasks/AstridOrderedListUpdater.java

@@ -65,12 +65,7 @@ public abstract class AstridOrderedListUpdater<LIST> {
 
     public void initializeFromSerializedTree(LIST list, Filter filter, String serializedTree) {
         idToNode.clear();
-        treeRoot = buildTreeModel(serializedTree, new JSONTreeModelBuilder() {
+        treeRoot = buildTreeModel(serializedTree, node -> idToNode.put(node.uuid, node));
-            @Override
-            public void afterAddNode(Node node) {
-                idToNode.put(node.uuid, node);
-            }
-        });
         verifyTreeModel(list, filter);
     }
 

src/main/java/com/todoroo/astrid/subtasks/SubtasksHelper.java

@@ -156,9 +156,7 @@ public class SubtasksHelper {
     }
 
     private static void remapLocalTreeToRemote(Node root, HashMap<Long, String> idMap) {
-        remapTree(root, idMap, new TreeRemapHelper<Long>() {
+        remapTree(root, idMap, uuid -> {
-            @Override
-            public Long getKeyFromOldUuid(String uuid) {
             Long localId = -1L;
             try {
                 localId = Long.parseLong(uuid);
@@ -166,7 +164,6 @@ public class SubtasksHelper {
                 Timber.e(e, e.getMessage());
             }
             return localId;
-            }
         });
     }
 

src/main/java/com/todoroo/astrid/tags/TagService.java

@@ -72,14 +72,11 @@ public final class TagService {
                         MetadataCriteria.withKey(TaskToTagMetadata.KEY))).
                 orderBy(order).groupBy(TaskToTagMetadata.TAG_NAME);
         final List<TagData> array = new ArrayList<>();
-        metadataDao.query(query, new Callback<Metadata>() {
+        metadataDao.query(query, metadata -> {
-            @Override
-            public void apply(Metadata metadata) {
             TagData tag = tagFromUUID(metadata.getValue(TaskToTagMetadata.TAG_UUID));
             if (tag != null) {
                 array.add(tag);
             }
-            }
         });
         return array.toArray(new TagData[array.size()]);
     }
@@ -94,12 +91,7 @@ public final class TagService {
                         MetadataCriteria.withKey(TaskToTagMetadata.KEY),
                         Metadata.DELETION_DATE.eq(0),
                         TaskToTagMetadata.TASK_UUID.eq(uuid))));
-        return newArrayList(Iterables.transform(tags, new Function<Metadata, TagData>() {
+        return newArrayList(Iterables.transform(tags, metadata -> tagFromUUID(metadata.getValue(TaskToTagMetadata.TAG_UUID))));
-            @Override
-            public TagData apply(Metadata metadata) {
-                return tagFromUUID(metadata.getValue(TaskToTagMetadata.TAG_UUID));
-            }
-        }));
     }
 
     public ArrayList<TagData> getTagDataForTask(long taskId) {
@@ -108,12 +100,7 @@ public final class TagService {
                         MetadataCriteria.withKey(TaskToTagMetadata.KEY),
                         Metadata.DELETION_DATE.eq(0),
                         MetadataCriteria.byTask(taskId))));
-        return newArrayList(transform(tags, new Function<Metadata, TagData>() {
+        return newArrayList(transform(tags, metadata -> tagFromUUID(metadata.getValue(TaskToTagMetadata.TAG_UUID))));
-            @Override
-            public TagData apply(Metadata metadata) {
-                return tagFromUUID(metadata.getValue(TaskToTagMetadata.TAG_UUID));
-            }
-        }));
     }
 
     public ArrayList<String> getTagNames(long taskId) {
@@ -124,11 +111,8 @@ public final class TagService {
                     MetadataCriteria.byTask(taskId)))
                 .orderBy(Order.asc(Functions.upper(TaskToTagMetadata.TAG_NAME)));
         final ArrayList<String> tagNames = new ArrayList<>();
-        metadataDao.query(query,  new Callback<Metadata>() {
+        metadataDao.query(query, entry -> {
-            @Override
-            public void apply(Metadata entry) {
             tagNames.add(entry.getValue(TaskToTagMetadata.TAG_NAME));
-            }
         });
         return tagNames;
     }
@@ -138,13 +122,10 @@ public final class TagService {
      */
     public List<TagData> getTagList() {
         final List<TagData> tagList = new ArrayList<>();
-        tagDataDao.tagDataOrderedByName(new Callback<TagData>() {
+        tagDataDao.tagDataOrderedByName(tagData -> {
-            @Override
-            public void apply(TagData tagData) {
             if (!TextUtils.isEmpty(tagData.getName())) {
                 tagList.add(tagData);
             }
-            }
         });
         return tagList;
     }

src/main/java/com/todoroo/astrid/tags/TagsControlSet.java

@@ -111,9 +111,7 @@ public final class TagsControlSet extends TaskEditControlFragment {
     };
 
     private Function<TagData, SpannableString> tagToString(final float maxLength) {
-        return new Function<TagData, SpannableString>() {
+        return tagData -> {
-            @Override
-            public SpannableString apply(TagData tagData) {
             String tagName = tagData.getName();
             tagName = tagName
                     .substring(0, Math.min(tagName.length(), (int) maxLength))
@@ -124,7 +122,6 @@ public final class TagsControlSet extends TaskEditControlFragment {
             string.setSpan(new BackgroundColorSpan(color.getPrimaryColor()), 0, string.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
             string.setSpan(new ForegroundColorSpan(color.getActionBarTint()), 0, string.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
             return string;
-            }
         };
     }
 
@@ -223,12 +220,7 @@ public final class TagsControlSet extends TaskEditControlFragment {
     private AlertDialog buildDialog() {
         return dialogBuilder.newDialog()
                 .setView(dialogView)
-                .setOnDismissListener(new DialogInterface.OnDismissListener() {
+                .setOnDismissListener(dialogInterface -> refreshDisplayView())
-                    @Override
-                    public void onDismiss(DialogInterface dialogInterface) {
-                        refreshDisplayView();
-                    }
-                })
                 .create();
     }
 
@@ -240,12 +232,7 @@ public final class TagsControlSet extends TaskEditControlFragment {
     }
 
     private boolean isSelected(List<TagData> selected, final String name) {
-        return Iterables.any(selected, new Predicate<TagData>() {
+        return Iterables.any(selected, input -> name.equalsIgnoreCase(input.getName()));
-            @Override
-            public boolean apply(TagData input) {
-                return name.equalsIgnoreCase(input.getName());
-            }
-        });
     }
 
     private ArrayList<TagData> getSelectedTags() {
@@ -335,9 +322,7 @@ public final class TagsControlSet extends TaskEditControlFragment {
             }
         });
 
-        textView.setOnEditorActionListener(new OnEditorActionListener() {
+        textView.setOnEditorActionListener((arg0, actionId, arg2) -> {
-            @Override
-            public boolean onEditorAction(TextView arg0, int actionId, KeyEvent arg2) {
             if(actionId != EditorInfo.IME_NULL) {
                 return false;
             }
@@ -345,12 +330,9 @@ public final class TagsControlSet extends TaskEditControlFragment {
                 addTag(""); //$NON-NLS-1$
             }
             return true;
-            }
         });
 
-        tagItem.findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {
+        tagItem.findViewById(R.id.button1).setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             TextView lastView = getLastTextView();
             if(lastView == textView && textView.getText().length() == 0) {
                 return;
@@ -361,7 +343,6 @@ public final class TagsControlSet extends TaskEditControlFragment {
             } else {
                 textView.setText(""); //$NON-NLS-1$
             }
-            }
         });
     }
 

src/main/java/com/todoroo/astrid/timers/TimerControlSet.java

@@ -125,18 +125,8 @@ public class TimerControlSet extends TaskEditControlFragment {
     private AlertDialog buildDialog() {
         return dialogBuilder.newDialog()
                 .setView(dialogView)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialog12, which) -> refreshDisplayView())
-                    @Override
+                .setOnCancelListener(dialog1 -> refreshDisplayView())
-                    public void onClick(DialogInterface dialog, int which) {
-                        refreshDisplayView();
-                    }
-                })
-                .setOnCancelListener(new DialogInterface.OnCancelListener() {
-                    @Override
-                    public void onCancel(DialogInterface dialog) {
-                        refreshDisplayView();
-                    }
-                })
                 .create();
     }
 
@@ -239,12 +229,9 @@ public class TimerControlSet extends TaskEditControlFragment {
             elapsed += DateUtilities.now() - timerStarted;
             chronometer.setBase(SystemClock.elapsedRealtime() - elapsed);
             if (elapsed > DateUtilities.ONE_DAY) {
-                chronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
+                chronometer.setOnChronometerTickListener(cArg -> {
-                    @Override
-                    public void onChronometerTick(Chronometer cArg) {
                     long t = SystemClock.elapsedRealtime() - cArg.getBase();
                     cArg.setText(DateFormat.format("d'd' h:mm", t)); //$NON-NLS-1$
-                    }
                 });
 
             }

src/main/java/com/todoroo/astrid/ui/DraggableListView.java

@@ -317,25 +317,17 @@ public class DraggableListView extends ListView {
             try {
                 Thread.sleep(300L);
 
-                post(new Runnable() {
+                post(() -> initiateDrag(ev));
-                    @Override
-                    public void run() {
-                        initiateDrag(ev);
-                    }
-                });
 
                 Thread.sleep(1000L);
 
-                post(new Runnable() {
+                post(() -> {
-                    @Override
-                    public void run() {
                     stopDragging();
                     dragThread = null;
                     Vibrator v = (Vibrator) getContext().getSystemService(
                             Context.VIBRATOR_SERVICE);
                     v.vibrate(50);
                     mClickListener.onLongClick(viewAtPosition());
-                    }
                 });
 
             } catch (InterruptedException e) {

src/main/java/com/todoroo/astrid/ui/ReminderControlSet.java

@@ -141,12 +141,7 @@ public class ReminderControlSet extends TaskEditControlFragment {
 
     private List<Long> currentAlarms() {
         final List<Long> alarms = new ArrayList<>();
-        alarmService.getAlarms(taskId, new Callback<Metadata>() {
+        alarmService.getAlarms(taskId, entry -> alarms.add(entry.getValue(AlarmFields.TIME)));
-            @Override
-            public void apply(Metadata entry) {
-                alarms.add(entry.getValue(AlarmFields.TIME));
-            }
-        });
         return alarms;
     }
 
@@ -284,12 +279,7 @@ public class ReminderControlSet extends TaskEditControlFragment {
     }
 
     public void addAlarmRow(final Long timestamp) {
-        addAlarmRow(getLongDateStringWithTime(context, timestamp), new OnClickListener() {
+        addAlarmRow(getLongDateStringWithTime(context, timestamp), v -> alarms.remove(timestamp));
-            @Override
-            public void onClick(View v) {
-                alarms.remove(timestamp);
-            }
-        });
         alarms.add(timestamp);
     }
 
@@ -301,12 +291,7 @@ public class ReminderControlSet extends TaskEditControlFragment {
     }
 
     public void addGeolocationReminder(final Geofence geofence) {
-        addAlarmRow(geofence.getName(), new OnClickListener() {
+        addAlarmRow(geofence.getName(), v -> geofences.remove(geofence));
-            @Override
-            public void onClick(View v) {
-                geofences.remove(geofence);
-            }
-        });
         geofences.add(geofence);
     }
 
@@ -349,15 +334,12 @@ public class ReminderControlSet extends TaskEditControlFragment {
     private void addAlarmRow(final View alertItem, String text, final View.OnClickListener onRemove) {
         TextView display = (TextView) alertItem.findViewById(R.id.alarm_string);
         display.setText(text);
-        alertItem.findViewById(R.id.clear).setOnClickListener(new OnClickListener() {
+        alertItem.findViewById(R.id.clear).setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             alertContainer.removeView(alertItem);
             if (onRemove != null) {
                 onRemove.onClick(v);
             }
             updateSpinner();
-            }
         });
         updateSpinner();
     }
@@ -384,31 +366,16 @@ public class ReminderControlSet extends TaskEditControlFragment {
 
     private void addDue() {
         whenDue = true;
-        addAlarmRow(getString(R.string.when_due), new OnClickListener() {
+        addAlarmRow(getString(R.string.when_due), v -> whenDue = false);
-            @Override
-            public void onClick(View v) {
-                whenDue = false;
-            }
-        });
     }
 
     private void addOverdue() {
         whenOverdue = true;
-        addAlarmRow(getString(R.string.when_overdue), new OnClickListener() {
+        addAlarmRow(getString(R.string.when_overdue), v -> whenOverdue = false);
-            @Override
-            public void onClick(View v) {
-                whenOverdue = false;
-            }
-        });
     }
 
     private void addRandomReminder(long reminderPeriod) {
-        View alarmRow = addAlarmRow(getString(R.string.randomly_once) + " ", new OnClickListener() {
+        View alarmRow = addAlarmRow(getString(R.string.randomly_once) + " ", v -> randomControlSet = null);
-            @Override
-            public void onClick(View v) {
-                randomControlSet = null;
-            }
-        });
         randomControlSet = new RandomReminderControlSet(context, alarmRow, reminderPeriod);
     }
 

src/main/java/com/todoroo/astrid/ui/TimeDurationControlSet.java

@@ -74,15 +74,8 @@ public class TimeDurationControlSet implements OnNNumberPickedListener, View.OnC
                     new int[] {999, 59}, new String[] {":", null});
             final NumberPicker hourPicker = dialog.getPicker(0);
             final NumberPicker minutePicker = dialog.getPicker(1);
-            minutePicker.setFormatter(new NumberPicker.Formatter() {
+            minutePicker.setFormatter(value -> String.format("%02d", value));
-                @Override
+            minutePicker.setOnChangeListener(newVal -> {
-                public String toString(int value) {
-                    return String.format("%02d", value);
-                }
-            });
-            minutePicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
-                @Override
-                public int onChanged(int newVal) {
                 if(newVal < 0) {
                     if(hourPicker.getCurrent() == 0) {
                         return 0;
@@ -94,7 +87,6 @@ public class TimeDurationControlSet implements OnNNumberPickedListener, View.OnC
                     return newVal % 60;
                 }
                 return newVal;
-                }
             });
         }
 

src/main/java/com/todoroo/astrid/voice/AACRecorder.java

@@ -30,18 +30,8 @@ public class AACRecorder {
             setOutputFormat(OutputFormat.MPEG_4);
             setAudioEncoder(AudioEncoder.AAC);
             setOutputFile(tempFile);
-            setOnErrorListener(new OnErrorListener() {
+            setOnErrorListener((mr, what, extra) -> Timber.e("mediaRecorder.onError(mr, %s, %s)", what, extra));
-                @Override
+            setOnInfoListener((mr, what, extra) -> Timber.i("mediaRecorder.onInfo(mr, %s, %s)", what, extra));
-                public void onError(MediaRecorder mr, int what, int extra) {
-                    Timber.e("mediaRecorder.onError(mr, %s, %s)", what, extra);
-                }
-            });
-            setOnInfoListener(new OnInfoListener() {
-                @Override
-                public void onInfo(MediaRecorder mr, int what, int extra) {
-                    Timber.i("mediaRecorder.onInfo(mr, %s, %s)", what, extra);
-                }
-            });
         }};
 
         try {

src/main/java/com/todoroo/astrid/voice/VoiceOutputAssistant.java

@@ -50,14 +50,11 @@ public class VoiceOutputAssistant implements OnInitListener {
         if (mTts != null && isTTSInitialized) {
             final String id = UUID.randomUUID().toString();
             Timber.d("%s: %s (%s)", mTts, textToSpeak, id);
-            mTts.setOnUtteranceCompletedListener(new TextToSpeech.OnUtteranceCompletedListener() {
+            mTts.setOnUtteranceCompletedListener(utteranceId -> {
-                @Override
-                public void onUtteranceCompleted(String utteranceId) {
                 Timber.d("%s: onUtteranceCompleted", utteranceId);
                 if(utteranceId.equals(id)) {
                     shutdown();
                 }
-                }
             });
             mTts.speak(textToSpeak, TextToSpeech.QUEUE_ADD, new HashMap<String, String>() {{
                 put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(AudioManager.STREAM_NOTIFICATION));

src/main/java/org/tasks/activities/CalendarSelectionDialog.java

@@ -72,25 +72,10 @@ public class CalendarSelectionDialog extends InjectingDialogFragment {
         adapter = new ArrayAdapter<>(getActivity(), R.layout.simple_list_item_single_choice_themed, calendarNames);
 
         AlertDialogBuilder builder = dialogBuilder.newDialog()
-                .setAdapter(adapter, new DialogInterface.OnClickListener() {
+                .setAdapter(adapter, (dialog, which) -> handler.selectedCalendar(calendars.get(which)))
-                    @Override
+                .setNegativeButton(android.R.string.cancel, (dialogInterface, i) -> handler.cancel());
-                    public void onClick(DialogInterface dialog, int which) {
-                        handler.selectedCalendar(calendars.get(which));
-                    }
-                })
-                .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int i) {
-                        handler.cancel();
-                    }
-                });
         if (enableNone) {
-            builder.setNeutralButton(R.string.none, new DialogInterface.OnClickListener() {
+            builder.setNeutralButton(R.string.none, (dialog, which) -> handler.selectedCalendar(AndroidCalendar.NONE));
-                @Override
-                public void onClick(DialogInterface dialog, int which) {
-                    handler.selectedCalendar(AndroidCalendar.NONE);
-                }
-            });
         }
 
         return builder.show();
@@ -104,12 +89,7 @@ public class CalendarSelectionDialog extends InjectingDialogFragment {
             calendars.clear();
             calendars.addAll(calendarProvider.getCalendars());
             calendarNames.clear();
-            calendarNames.addAll(transform(calendars, new Function<AndroidCalendar, String>() {
+            calendarNames.addAll(transform(calendars, AndroidCalendar::getName));
-                @Override
-                public String apply(AndroidCalendar androidCalendar) {
-                    return androidCalendar.getName();
-                }
-            }));
             if (calendarNames.isEmpty()) {
                 Toast.makeText(getActivity(), R.string.no_calendars_found, Toast.LENGTH_LONG).show();
                 handler.cancel();

src/main/java/org/tasks/activities/ColorPickerActivity.java

@@ -66,7 +66,7 @@ public class ColorPickerActivity extends InjectingAppCompatActivity implements C
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == REQUEST_PURCHASE) {
-            purchaseHelper.handleActivityResult(PurchaseHelperCallback.NO_OP, requestCode, resultCode, data);
+            purchaseHelper.handleActivityResult(null, requestCode, resultCode, data);
         } else {
             super.onActivityResult(requestCode, resultCode, data);
         }

src/main/java/org/tasks/activities/DatePickerActivity.java

@@ -52,12 +52,7 @@ public class DatePickerActivity extends InjectingAppCompatActivity implements Da
                 dialog.setAccentColor(themeAccent.getAccentColor());
                 dialog.show(fragmentManager, FRAG_TAG_DATE_PICKER);
             }
-            dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            dialog.setOnCancelListener(dialogInterface -> finish());
-                @Override
-                public void onCancel(DialogInterface dialogInterface) {
-                    finish();
-                }
-            });
             dialog.setOnDateSetListener(this);
         }
     }

src/main/java/org/tasks/activities/FilterSelectionActivity.java

@@ -43,9 +43,7 @@ public class FilterSelectionActivity extends InjectingAppCompatActivity {
         filterAdapter.populateList();
 
         dialogBuilder.newDialog()
-                .setSingleChoiceItems(filterAdapter, -1, new DialogInterface.OnClickListener() {
+                .setSingleChoiceItems(filterAdapter, -1, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     final Filter selectedFilter = (Filter) filterAdapter.getItem(which);
                     setResult(RESULT_OK, new Intent() {{
                         if (returnFilter) {
@@ -58,14 +56,8 @@ public class FilterSelectionActivity extends InjectingAppCompatActivity {
                         }
                     }});
                     dialog.dismiss();
-                    }
-                })
-                .setOnDismissListener(new DialogInterface.OnDismissListener() {
-                    @Override
-                    public void onDismiss(DialogInterface dialog) {
-                        finish();
-                    }
                 })
+                .setOnDismissListener(dialog -> finish())
                 .show();
     }
 

src/main/java/org/tasks/activities/TimePickerActivity.java

@@ -56,12 +56,7 @@ public class TimePickerActivity extends InjectingAppCompatActivity implements Ti
                 dialog.setAccentColor(themeAccent.getAccentColor());
                 dialog.show(fragmentManager, FRAG_TAG_TIME_PICKER);
             }
-            dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            dialog.setOnCancelListener(dialogInterface -> finish());
-                @Override
-                public void onCancel(DialogInterface dialogInterface) {
-                    finish();
-                }
-            });
             dialog.setOnTimeSetListener(this);
         }
     }

src/main/java/org/tasks/billing/PurchaseHelperCallback.java

@@ -1,13 +1,5 @@
 package org.tasks.billing;
 
 public interface PurchaseHelperCallback {
-
-    PurchaseHelperCallback NO_OP = new PurchaseHelperCallback() {
-        @Override
-        public void purchaseCompleted(boolean success, String sku) {
-
-        }
-    };
-
     void purchaseCompleted(boolean success, String sku);
 }

src/main/java/org/tasks/dialogs/AddAttachmentDialog.java

@@ -44,42 +44,19 @@ public class AddAttachmentDialog extends InjectingDialogFragment {
         final List<Runnable> actions = newArrayList();
         if (device.hasCamera()) {
             entries.add(getString(R.string.take_a_picture));
-            actions.add(new Runnable() {
+            actions.add(() -> callback.takePicture());
-                @Override
-                public void run() {
-                    callback.takePicture();
-                }
-            });
         }
         entries.add(getString(R.string.premium_record_audio));
-        actions.add(new Runnable() {
+        actions.add(() -> callback.recordNote());
-            @Override
-            public void run() {
-                callback.recordNote();
-            }
-        });
         if (device.hasGallery()) {
             entries.add(getString(R.string.pick_from_gallery));
-            actions.add(new Runnable() {
+            actions.add(() -> callback.pickFromGallery());
-                @Override
-                public void run() {
-                    callback.pickFromGallery();
-                }
-            });
         }
         entries.add(getString(R.string.pick_from_storage));
-        actions.add(new Runnable() {
+        actions.add(() -> callback.pickFromStorage());
-            @Override
-            public void run() {
-                callback.pickFromStorage();
-            }
-        });
         return dialogBuilder.newDialog()
-                .setItems(entries, new DialogInterface.OnClickListener() {
+                .setItems(entries, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     actions.get(which).run();
-                    }
                 })
                 .show();
     }

src/main/java/org/tasks/dialogs/ColorPickerDialog.java

@@ -89,22 +89,14 @@ public class ColorPickerDialog extends InjectingDialogFragment {
         };
 
         return dialogBuilder.newDialog(theme)
-                .setAdapter(adapter, new DialogInterface.OnClickListener() {
+                .setAdapter(adapter, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     if (preferences.hasPurchase(R.string.p_purchased_themes) || which < getNumFree()) {
                         callback.themePicked(palette, which);
                     } else {
                         callback.initiateThemePurchase();
                     }
-                    }
-                })
-                .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int i) {
-                        callback.dismissed();
-                    }
                 })
+                .setNegativeButton(android.R.string.cancel, (dialogInterface, i) -> callback.dismissed())
                 .show();
     }
 

src/main/java/org/tasks/dialogs/DonationDialog.java

@@ -31,9 +31,7 @@ public class DonationDialog extends InjectingNativeDialogFragment {
         final List<String> donationValues = getDonationValues();
         return dialogBuilder.newDialog()
                 .setTitle(R.string.select_amount)
-                .setItems(donationValues, new DialogInterface.OnClickListener() {
+                .setItems(donationValues, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     String value = donationValues.get(which);
                     Pattern pattern = Pattern.compile("\\$(\\d+) USD");
                     Matcher matcher = pattern.matcher(value);
@@ -41,7 +39,6 @@ public class DonationDialog extends InjectingNativeDialogFragment {
                     matcher.matches();
                     String sku = String.format(java.util.Locale.ENGLISH, "%03d", Integer.parseInt(matcher.group(1)));
                     purchaseHelper.purchase(dialogBuilder, getActivity(), sku, null, BasicPreferences.REQUEST_PURCHASE, (BasicPreferences) getActivity());
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();

src/main/java/org/tasks/dialogs/NativeTimePickerDialog.java

@@ -40,11 +40,8 @@ public class NativeTimePickerDialog extends InjectingNativeDialogFragment implem
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         Context context = theme.wrap(getActivity());
         TimePickerDialog timePickerDialog = new TimePickerDialog(context, this, 0, 0, DateUtilities.is24HourFormat(context));
-        timePickerDialog.setButton(DialogInterface.BUTTON_NEGATIVE, getString(android.R.string.cancel), new DialogInterface.OnClickListener() {
+        timePickerDialog.setButton(DialogInterface.BUTTON_NEGATIVE, getString(android.R.string.cancel), (dialogInterface, i) -> {
-            @Override
-            public void onClick(DialogInterface dialogInterface, int i) {
             callback.cancel();
-            }
         });
         if (initial != null) {
             timePickerDialog.updateTime(initial.getHourOfDay(), initial.getMinuteOfHour());

src/main/java/org/tasks/dialogs/SeekBarDialog.java

@@ -66,12 +66,7 @@ public class SeekBarDialog extends InjectingNativeDialogFragment {
         slider.setValue(initial, true);
         return dialogBuilder.newDialog()
                 .setView(view)
-                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                .setPositiveButton(android.R.string.ok, (dialogInterface, i) -> callback.valueSelected(slider.getValue(), requestCode))
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int i) {
-                        callback.valueSelected(slider.getValue(), requestCode);
-                    }
-                })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();
     }

src/main/java/org/tasks/dialogs/SortDialog.java

@@ -79,25 +79,12 @@ public class SortDialog extends InjectingDialogFragment {
         }
 
         alertDialog = dialogBuilder.newDialog()
-                .setSingleChoiceItems(items, selectedIndex, new DialogInterface.OnClickListener() {
+                .setSingleChoiceItems(items, selectedIndex, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     selectedIndex = which;
                     enableReverse();
-                    }
-                })
-                .setPositiveButton(R.string.TLA_menu_sort, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        setSelection(false);
-                    }
-                })
-                .setNeutralButton(R.string.reverse, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        setSelection(true);
-                    }
                 })
+                .setPositiveButton(R.string.TLA_menu_sort, (dialog, which) -> setSelection(false))
+                .setNeutralButton(R.string.reverse, (dialog, which) -> setSelection(true))
                 .setNegativeButton(android.R.string.cancel, null)
                 .showThemedListView();
 

src/main/java/org/tasks/filters/FilterCounter.java

@@ -42,9 +42,7 @@ public class FilterCounter {
     }
 
     public void refreshFilterCounts(final Runnable onComplete) {
-        executorService.submit(new Runnable() {
+        executorService.submit(() -> {
-            @Override
-            public void run() {
             for (Filter filter : filterCounts.keySet()) {
                 int size = countTasks(filter);
                 filterCounts.put(filter, size);
@@ -52,7 +50,6 @@ public class FilterCounter {
             if (onComplete != null) {
                 onComplete.run();
             }
-            }
         });
     }
 

src/main/java/org/tasks/filters/FilterCriteriaProvider.java

@@ -83,12 +83,7 @@ public class FilterCriteriaProvider {
 
     private CustomFilterCriterion getTagFilter() {
         // TODO: adding to hash set because duplicate tag name bug hasn't been fixed yet
-        List<String> tags = newArrayList(newLinkedHashSet(transform(tagService.getTagList(), new Function<TagData, String>() {
+        List<String> tags = newArrayList(newLinkedHashSet(transform(tagService.getTagList(), TagData::getName)));
-            @Override
-            public String apply(TagData tagData) {
-                return tagData.getName();
-            }
-        })));
         String[] tagNames = tags.toArray(new String[tags.size()]);
         ContentValues values = new ContentValues();
         values.put(Metadata.KEY.name, TaskToTagMetadata.KEY);

src/main/java/org/tasks/fragments/CommentBarFragment.java

@@ -182,12 +182,9 @@ public class CommentBarFragment extends TaskEditControlFragment {
         if (pendingCommentPicture == null) {
             showPictureLauncher(null);
         } else {
-            showPictureLauncher(new ClearImageCallback() {
+            showPictureLauncher(() -> {
-                @Override
-                public void clearImage() {
                 pendingCommentPicture = null;
                 resetPictureButton();
-                }
             });
         }
     }
@@ -254,34 +251,21 @@ public class CommentBarFragment extends TaskEditControlFragment {
 
         final boolean cameraAvailable = device.hasCamera();
         if (cameraAvailable) {
-            runnables.add(new Runnable() {
+            runnables.add(() -> startActivityForResult(new Intent(activity, CameraActivity.class), REQUEST_CODE_CAMERA));
-                @Override
-                public void run() {
-                    startActivityForResult(new Intent(activity, CameraActivity.class), REQUEST_CODE_CAMERA);
-                }
-            });
             options.add(getString(R.string.take_a_picture));
         }
 
         if (clearImageOption != null) {
-            runnables.add(new Runnable() {
+            runnables.add(clearImageOption::clearImage);
-                @Override
-                public void run() {
-                    clearImageOption.clearImage();
-                }
-            });
             options.add(getString(R.string.actfm_picture_clear));
         }
 
         if (runnables.size() == 1) {
             runnables.get(0).run();
         } else {
-            DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
+            DialogInterface.OnClickListener listener = (d, which) -> {
-                @Override
-                public void onClick(DialogInterface d, int which) {
                 runnables.get(which).run();
                 d.dismiss();
-                }
             };
 
             // show a menu of available options

src/main/java/org/tasks/injection/InjectingPreferenceActivity.java

@@ -60,12 +60,7 @@ public abstract class InjectingPreferenceActivity extends AppCompatPreferenceAct
             toolbar.setTitle(getTitle());
         }
         toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_arrow_back_24dp));
-        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+        toolbar.setNavigationOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
         MenuColorizer.colorToolbar(this, toolbar);
     }
 

src/main/java/org/tasks/locale/LocalePickerDialog.java

@@ -42,19 +42,11 @@ public class LocalePickerDialog extends InjectingNativeDialogFragment {
         for (String override : getResources().getStringArray(R.array.localization)) {
             locales.add(locale.withLanguage(override));
         }
-        final List<String> display = transform(locales, new Function<Locale, String>() {
+        final List<String> display = transform(locales, Locale::getDisplayName);
-            @Override
-            public String apply(Locale input) {
-                return input.getDisplayName();
-            }
-        });
         return dialogBuilder.newDialog()
-                .setItems(display, new DialogInterface.OnClickListener() {
+                .setItems(display, (dialogInterface, i) -> {
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int i) {
                     dialogInterface.dismiss();
                     callback.onLocaleSelected(locales.get(i));
-                    }
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();

src/main/java/org/tasks/location/GeofenceService.java

@@ -62,25 +62,15 @@ public class GeofenceService {
     }
 
     public boolean synchronizeGeofences(final long taskId, Set<Geofence> geofences) {
-        List<Metadata> metadata = newArrayList(transform(geofences, new Function<Geofence, Metadata>() {
+        List<Metadata> metadata = newArrayList(transform(geofences, (Function<Geofence, Metadata>) geofence -> new Metadata() {{
-            @Override
-            public Metadata apply(final Geofence geofence) {
-                return new Metadata() {{
             setKey(GeofenceFields.METADATA_KEY);
             setValue(GeofenceFields.PLACE, geofence.getName());
             setValue(GeofenceFields.LATITUDE, geofence.getLatitude());
             setValue(GeofenceFields.LONGITUDE, geofence.getLongitude());
             setValue(GeofenceFields.RADIUS, geofence.getRadius());
-                }};
+        }}));
-            }
-        }));
 
-        boolean changed = synchronizeMetadata(taskId, metadata, new SynchronizeMetadataCallback() {
+        boolean changed = synchronizeMetadata(taskId, metadata, m -> geofenceApi.cancel(new Geofence(m)));
-            @Override
-            public void beforeDeleteMetadata(Metadata m) {
-                geofenceApi.cancel(new Geofence(m));
-            }
-        });
 
         if(changed) {
             setupGeofences(taskId);
@@ -89,12 +79,7 @@ public class GeofenceService {
     }
 
     private List<Geofence> toGeofences(List<Metadata> geofences) {
-        return newArrayList(transform(geofences, new Function<Metadata, Geofence>() {
+        return newArrayList(transform(geofences, Geofence::new));
-            @Override
-            public Geofence apply(Metadata metadata) {
-                return new Geofence(metadata);
-            }
-        }));
     }
 
     private List<Geofence> getActiveGeofences() {
@@ -128,9 +113,7 @@ public class GeofenceService {
             newMetadataValues.add(values);
         }
 
-        metadataDao.byTaskAndKey(taskId, GeofenceFields.METADATA_KEY, new Callback<Metadata>() {
+        metadataDao.byTaskAndKey(taskId, GeofenceFields.METADATA_KEY, item -> {
-            @Override
-            public void apply(Metadata item) {
             long id = item.getId();
 
             // clear item id when matching with incoming values
@@ -149,7 +132,6 @@ public class GeofenceService {
                 metadataDao.delete(id);
                 dirty[0] = true;
             }
-            }
         });
 
         // everything that remains shall be written

src/main/java/org/tasks/preferences/AppearancePreferences.java

@@ -46,24 +46,18 @@ public class AppearancePreferences extends InjectingPreferenceActivity {
         setExtraOnChange(R.string.p_show_today_filter, EXTRA_FILTERS_CHANGED);
         setExtraOnChange(R.string.p_show_recently_modified_filter, EXTRA_FILTERS_CHANGED);
         setExtraOnChange(R.string.p_show_not_in_list_filter, EXTRA_FILTERS_CHANGED);
-        findPreference(getString(R.string.customize_edit_screen)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.customize_edit_screen)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(AppearancePreferences.this, BeastModePreferences.class), REQUEST_CUSTOMIZE);
             return true;
-            }
         });
         Preference defaultList = findPreference(getString(R.string.p_default_list));
         Filter filter = defaultFilterProvider.getDefaultFilter();
         defaultList.setSummary(filter.listingTitle);
-        defaultList.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        defaultList.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(AppearancePreferences.this, FilterSelectionActivity.class) {{
                 putExtra(FilterSelectionActivity.EXTRA_RETURN_FILTER, true);
             }}, REQUEST_DEFAULT_LIST);
             return true;
-            }
         });
     }
 
@@ -100,13 +94,10 @@ public class AppearancePreferences extends InjectingPreferenceActivity {
     }
 
     private void setExtraOnChange(final int resId, final String extra) {
-        findPreference(getString(resId)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        findPreference(getString(resId)).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             tracker.reportEvent(Tracking.Events.SET_PREFERENCE, resId, newValue.toString());
             result.putBoolean(extra, true);
             return true;
-            }
         });
     }
 

src/main/java/org/tasks/preferences/BackupPreferences.java

@@ -31,22 +31,16 @@ public class BackupPreferences extends InjectingPreferenceActivity {
 
         addPreferencesFromResource(R.xml.preferences_backup);
 
-        getPref(R.string.backup_BAc_import).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        getPref(R.string.backup_BAc_import).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(BackupPreferences.this, FileExplore.class) {{
                 putExtra(FileExplore.EXTRA_START_PATH, preferences.getBackupDirectory().getAbsolutePath());
             }}, REQUEST_PICKER);
             return false;
-            }
         });
 
-        getPref(R.string.backup_BAc_export).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        getPref(R.string.backup_BAc_export).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             newExportTasksDialog().show(getFragmentManager(), FRAG_TAG_EXPORT_TASKS);
             return false;
-            }
         });
 
         initializeBackupDirectory();
@@ -71,15 +65,12 @@ public class BackupPreferences extends InjectingPreferenceActivity {
     }
 
     private void initializeBackupDirectory() {
-        findPreference(getString(R.string.p_backup_dir)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.p_backup_dir)).setOnPreferenceClickListener(p -> {
-            @Override
-            public boolean onPreferenceClick(Preference p) {
             Intent filesDir = new Intent(BackupPreferences.this, FileExplore.class);
             filesDir.putExtra(FileExplore.EXTRA_DIRECTORY_MODE, true);
             filesDir.putExtra(FileExplore.EXTRA_START_PATH, getBackupDirectory());
             startActivityForResult(filesDir, REQUEST_CODE_BACKUP_DIR);
             return true;
-            }
         });
         updateBackupDirectory();
     }

src/main/java/org/tasks/preferences/BasicPreferences.java

@@ -83,94 +83,68 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
 
         Preference themePreference = findPreference(getString(R.string.p_theme));
         themePreference.setSummary(themeBase.getName());
-        themePreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        themePreference.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(BasicPreferences.this, ColorPickerActivity.class) {{
                 putExtra(ColorPickerActivity.EXTRA_PALETTE, ColorPickerDialog.ColorPalette.THEMES);
             }}, REQUEST_THEME_PICKER);
             return false;
-            }
         });
         Preference colorPreference = findPreference(getString(R.string.p_theme_color));
         colorPreference.setSummary(themeColor.getName());
-        colorPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        colorPreference.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(BasicPreferences.this, ColorPickerActivity.class) {{
                 putExtra(ColorPickerActivity.EXTRA_PALETTE, ColorPickerDialog.ColorPalette.COLORS);
             }}, REQUEST_COLOR_PICKER);
             return false;
-            }
         });
         Preference accentPreference = findPreference(getString(R.string.p_theme_accent));
         accentPreference.setSummary(themeAccent.getName());
-        accentPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        accentPreference.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(BasicPreferences.this, ColorPickerActivity.class) {{
                 putExtra(ColorPickerActivity.EXTRA_PALETTE, ColorPickerDialog.ColorPalette.ACCENTS);
             }}, REQUEST_ACCENT_PICKER);
             return false;
-            }
         });
         Preference languagePreference = findPreference(getString(R.string.p_language));
         updateLocale();
-        languagePreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        languagePreference.setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             newLocalePickerDialog()
                     .show(getFragmentManager(), FRAG_TAG_LOCALE_PICKER);
             return false;
-            }
         });
-        findPreference(getString(R.string.p_layout_direction)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        findPreference(getString(R.string.p_layout_direction)).setOnPreferenceChangeListener((preference, o) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object o) {
             tracker.reportEvent(Tracking.Events.SET_PREFERENCE, R.string.p_layout_direction, o.toString());
             int newValue = Integer.parseInt((String) o);
             if (locale.getDirectionality() != locale.withDirectionality(newValue).getDirectionality()) {
                 showRestartDialog();
             }
             return true;
-            }
         });
-        findPreference(getString(R.string.p_collect_statistics)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        findPreference(getString(R.string.p_collect_statistics)).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue != null) {
                 tracker.setTrackingEnabled((boolean) newValue);
                 return true;
             }
             return false;
-            }
         });
 
-        getPref(R.string.TLA_menu_donate).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        getPref(R.string.TLA_menu_donate).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             if (BuildConfig.FLAVOR_store.equals("googleplay")) {
                 newDonationDialog().show(getFragmentManager(), FRAG_TAG_DONATION);
             } else {
                 startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("http://tasks.org/donate")));
             }
             return false;
-            }
         });
 
-        getPref(R.string.p_purchased_themes).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        getPref(R.string.p_purchased_themes).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue != null && (boolean) newValue && !preferences.hasPurchase(R.string.p_purchased_themes)) {
                 purchaseHelper.purchase(dialogBuilder, BasicPreferences.this, getString(R.string.sku_themes), getString(R.string.p_purchased_themes), REQUEST_PURCHASE, BasicPreferences.this);
             }
             return false;
-            }
         });
 
-        getPref(R.string.p_tesla_unread_enabled).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        getPref(R.string.p_tesla_unread_enabled).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue != null) {
                 if ((boolean) newValue && !preferences.hasPurchase(R.string.p_purchased_tesla_unread)) {
                     purchaseHelper.purchase(dialogBuilder, BasicPreferences.this, getString(R.string.sku_tesla_unread), getString(R.string.p_purchased_tesla_unread), REQUEST_PURCHASE, BasicPreferences.this);
@@ -180,51 +154,38 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
                 }
             }
             return false;
-            }
         });
 
-        getPref(R.string.p_purchased_tasker).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        getPref(R.string.p_purchased_tasker).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue != null && (boolean) newValue && !preferences.hasPurchase(R.string.p_purchased_tasker)) {
                 purchaseHelper.purchase(dialogBuilder, BasicPreferences.this, getString(R.string.sku_tasker), getString(R.string.p_purchased_tasker), REQUEST_PURCHASE, BasicPreferences.this);
             }
             return false;
-            }
         });
 
-        getPref(R.string.p_purchased_dashclock).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        getPref(R.string.p_purchased_dashclock).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue != null && (boolean) newValue && !preferences.hasPurchase(R.string.p_purchased_dashclock)) {
                 purchaseHelper.purchase(dialogBuilder, BasicPreferences.this, getString(R.string.sku_dashclock), getString(R.string.p_purchased_dashclock), REQUEST_PURCHASE, BasicPreferences.this);
             }
             return false;
-            }
         });
 
         if (BuildConfig.DEBUG) {
             addPreferencesFromResource(R.xml.preferences_debug);
 
-            findPreference(getString(R.string.debug_unlock_purchases)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            findPreference(getString(R.string.debug_unlock_purchases)).setOnPreferenceClickListener(preference -> {
-                @Override
-                public boolean onPreferenceClick(Preference preference) {
                 preferences.setBoolean(R.string.p_purchased_dashclock, true);
                 preferences.setBoolean(R.string.p_purchased_tasker, true);
                 preferences.setBoolean(R.string.p_purchased_tesla_unread, true);
                 preferences.setBoolean(R.string.p_purchased_themes, true);
                 recreate();
                 return true;
-                }
             });
 
-            findPreference(getString(R.string.debug_consume_purchases)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            findPreference(getString(R.string.debug_consume_purchases)).setOnPreferenceClickListener(preference -> {
-                @Override
-                public boolean onPreferenceClick(Preference preference) {
                 purchaseHelper.consumePurchases();
                 recreate();
                 return true;
-                }
             });
         }
 
@@ -239,12 +200,9 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
     }
 
     private void setupActivity(int key, final Class<?> target) {
-        findPreference(getString(key)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(key)).setOnPreferenceClickListener(preference -> {
-            @Override
-            public boolean onPreferenceClick(Preference preference) {
             startActivityForResult(new Intent(BasicPreferences.this, target), RC_PREFS);
             return true;
-            }
         });
     }
 
@@ -310,14 +268,9 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
     private void showRestartDialog() {
         dialogBuilder.newDialog()
                 .setMessage(R.string.restart_required)
-                .setPositiveButton(R.string.restart_now, new DialogInterface.OnClickListener() {
+                .setPositiveButton(R.string.restart_now, (dialogInterface, i) -> ProcessPhoenix.triggerRebirth(BasicPreferences.this, new Intent(BasicPreferences.this, TaskListActivity.class) {{
-                    @Override
-                    public void onClick(DialogInterface dialogInterface, int i) {
-                        ProcessPhoenix.triggerRebirth(BasicPreferences.this, new Intent(BasicPreferences.this, TaskListActivity.class) {{
                     putExtra(TaskListActivity.OPEN_FILTER, (Filter) null);
-                        }});
+                }}))
-                    }
-                })
                 .setNegativeButton(R.string.restart_later, null)
                 .show();
     }
@@ -339,9 +292,7 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
 
     @Override
     public void purchaseCompleted(final boolean success, final String sku) {
-        runOnUiThread(new Runnable() {
+        runOnUiThread(() -> {
-            @Override
-            public void run() {
             if (getString(R.string.sku_tasker).equals(sku)) {
                 ((TwoStatePreference) getPref(R.string.p_purchased_tasker)).setChecked(success);
             } else if (getString(R.string.sku_tesla_unread).equals(sku)) {
@@ -353,7 +304,6 @@ public class BasicPreferences extends InjectingPreferenceActivity implements
             } else {
                 Timber.d("Unhandled sku: %s", sku);
             }
-            }
         });
     }
 

src/main/java/org/tasks/preferences/DateShortcutPreferences.java

@@ -53,15 +53,12 @@ public class DateShortcutPreferences extends InjectingPreferenceActivity impleme
 
     private void initializeTimePreference(final TimePreference preference, final int requestCode) {
         preference.setOnPreferenceChangeListener(this);
-        preference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        preference.setOnPreferenceClickListener(ignored -> {
-            @Override
-            public boolean onPreferenceClick(Preference ignored) {
             final DateTime current = new DateTime().withMillisOfDay(preference.getMillisOfDay());
             startActivityForResult(new Intent(DateShortcutPreferences.this, TimePickerActivity.class) {{
                 putExtra(TimePickerActivity.EXTRA_TIMESTAMP, current.getMillis());
             }}, requestCode);
             return true;
-            }
         });
     }
 

src/main/java/org/tasks/preferences/MiscellaneousPreferences.java

@@ -84,15 +84,12 @@ public class MiscellaneousPreferences extends InjectingPreferenceActivity {
     }
 
     private void initializeAttachmentDirectoryPreference() {
-        findPreference(getString(R.string.p_attachment_dir)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        findPreference(getString(R.string.p_attachment_dir)).setOnPreferenceClickListener(p -> {
-            @Override
-            public boolean onPreferenceClick(Preference p) {
             Intent filesDir = new Intent(MiscellaneousPreferences.this, FileExplore.class);
             filesDir.putExtra(FileExplore.EXTRA_DIRECTORY_MODE, true);
             filesDir.putExtra(FileExplore.EXTRA_START_PATH, getAttachmentDirectory());
             startActivityForResult(filesDir, REQUEST_CODE_FILES_DIR);
             return true;
-            }
         });
         updateAttachmentDirectory();
     }
@@ -108,9 +105,7 @@ public class MiscellaneousPreferences extends InjectingPreferenceActivity {
 
     private void initializeCalendarReminderPreference() {
         CheckBoxPreference calendarReminderPreference = (CheckBoxPreference) findPreference(getString(R.string.p_calendar_reminders));
-        calendarReminderPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        calendarReminderPreference.setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             if (newValue == null) {
                 return false;
             }
@@ -122,15 +117,12 @@ public class MiscellaneousPreferences extends InjectingPreferenceActivity {
                 return true;
             }
             return false;
-            }
         });
         calendarReminderPreference.setChecked(calendarReminderPreference.isChecked() && permissionChecker.canAccessCalendars());
     }
 
     private void initializeVoiceReminderPreference() {
-        findPreference(getString(R.string.p_voiceRemindersEnabled)).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        findPreference(getString(R.string.p_voiceRemindersEnabled)).setOnPreferenceChangeListener((preference, newValue) -> {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
             boolean enabled = (boolean) newValue;
             try {
                 if (enabled && !voiceOutputAssistant.isTTSInitialized()) {
@@ -146,7 +138,6 @@ public class MiscellaneousPreferences extends InjectingPreferenceActivity {
                 preferences.setBoolean(preference.getKey(), false);
             }
             return true;
-            }
         });
     }
 

src/main/java/org/tasks/receivers/ListNotificationReceiver.java

@@ -35,15 +35,10 @@ public class ListNotificationReceiver extends InjectingBroadcastReceiver {
 
         tracker.reportEvent(Tracking.Events.LEGACY_TASKER_TRIGGER);
 
-        executorService.execute(new Runnable() {
+        executorService.execute(() -> notifier.triggerFilterNotification(
-            @Override
-            public void run() {
-                notifier.triggerFilterNotification(
                 intent.getStringExtra(EXTRA_FILTER_TITLE),
                 intent.getStringExtra(EXTRA_FILTER_QUERY),
-                        intent.getStringExtra(EXTRA_FILTER_VALUES));
+                intent.getStringExtra(EXTRA_FILTER_VALUES)));
-            }
-        });
     }
 
     @Override

src/main/java/org/tasks/receivers/RepeatConfirmationReceiver.java

@@ -72,13 +72,10 @@ public class RepeatConfirmationReceiver extends BroadcastReceiver {
         String dueDateString = getRelativeDateAndTimeString(activity, newDueDate);
         String snackbarText = activity.getString(R.string.repeat_snackbar, task.getTitle(), dueDateString);
         taskListFragment.makeSnackbar(snackbarText)
-                .setAction(R.string.DLG_undo, new View.OnClickListener() {
+                .setAction(R.string.DLG_undo, v -> {
-                    @Override
-                    public void onClick(View v) {
                     task.setDueDateAdjustingHideUntil(oldDueDate);
                     task.setCompletionDate(0L);
                     taskService.save(task);
-                    }
                 })
                 .show();
     }

src/main/java/org/tasks/receivers/TaskNotificationReceiver.java

@@ -25,14 +25,9 @@ public class TaskNotificationReceiver extends InjectingBroadcastReceiver {
     public void onReceive(Context context, final Intent intent) {
         super.onReceive(context, intent);
 
-        executorService.execute(new Runnable() {
+        executorService.execute(() -> notifier.triggerTaskNotification(
-            @Override
-            public void run() {
-                notifier.triggerTaskNotification(
                 intent.getLongExtra(ID_KEY, 0),
-                        intent.getIntExtra(EXTRAS_TYPE, (byte) 0));
+                intent.getIntExtra(EXTRAS_TYPE, (byte) 0)));
-            }
-        });
     }
 
     @Override

src/main/java/org/tasks/reminders/MissedCallDialog.java

@@ -49,9 +49,7 @@ public class MissedCallDialog extends InjectingDialogFragment {
 
         return dialogBuilder.newDialog()
                 .setTitle(title)
-                .setItems(actions, new DialogInterface.OnClickListener() {
+                .setItems(actions, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     switch (which) {
                         case 0:
                             handler.callNow();
@@ -63,7 +61,6 @@ public class MissedCallDialog extends InjectingDialogFragment {
                             handler.ignore();
                             break;
                     }
-                    }
                 })
                 .show();
     }

src/main/java/org/tasks/reminders/NotificationDialog.java

@@ -50,9 +50,7 @@ public class NotificationDialog extends InjectingDialogFragment {
 
         return dialogBuilder.newDialog()
                 .setTitle(title)
-                .setItems(items, new DialogInterface.OnClickListener() {
+                .setItems(items, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     switch (which) {
                         case 0:
                             handler.edit();
@@ -64,7 +62,6 @@ public class NotificationDialog extends InjectingDialogFragment {
                             handler.complete();
                             break;
                     }
-                    }
                 })
                 .show();
     }

src/main/java/org/tasks/reminders/SnoozeDialog.java

@@ -46,9 +46,7 @@ public class SnoozeDialog extends InjectingDialogFragment {
 
         return dialogBuilder.newDialog()
                 .setTitle(R.string.rmd_NoA_snooze)
-                .setItems(items, new DialogInterface.OnClickListener() {
+                .setItems(items, (dialog, which) -> {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
                     switch (which) {
                         case 0:
                         case 1:
@@ -60,7 +58,6 @@ public class SnoozeDialog extends InjectingDialogFragment {
                             snoozeCallback.pickDateTime();
                             break;
                     }
-                    }
                 })
                 .show();
     }

src/main/java/org/tasks/scheduling/BackupIntentService.java

@@ -65,14 +65,11 @@ public class BackupIntentService extends MidnightIntentService {
     }
 
     private void deleteOldBackups() {
-        FileFilter backupFileFilter = new FileFilter() {
+        FileFilter backupFileFilter = file -> {
-            @Override
-            public boolean accept(File file) {
             if (file.getName().matches(BACKUP_FILE_NAME_REGEX)) {
                 return true;
             }
             return false;
-            }
         };
         File astridDir = preferences.getBackupDirectory();
         if(astridDir == null) {
@@ -85,12 +82,7 @@ public class BackupIntentService extends MidnightIntentService {
             return;
         }
 
-        Arrays.sort(files, new Comparator<File>() {
+        Arrays.sort(files, (file1, file2) -> -Long.valueOf(file1.lastModified()).compareTo(file2.lastModified()));
-            @Override
-            public int compare(File file1, File file2) {
-                return -Long.valueOf(file1.lastModified()).compareTo(file2.lastModified());
-            }
-        });
         for(int i = DAYS_TO_KEEP_BACKUP; i < files.length; i++) {
             if(!files[i].delete()) {
                 Timber.i("Unable to delete: %s", files[i]);

src/main/java/org/tasks/scheduling/RefreshScheduler.java

@@ -41,12 +41,7 @@ public class RefreshScheduler {
         Criterion criterion = Criterion.or(
                 Criterion.and(Task.HIDE_UNTIL.gt(now), Task.HIDE_UNTIL.lt(midnight)),
                 Criterion.and(Task.DUE_DATE.gt(now), Task.DUE_DATE.lt(midnight)));
-        taskDao.selectActive(criterion, new Callback<Task>() {
+        taskDao.selectActive(criterion, this::scheduleRefresh);
-            @Override
-            public void apply(Task task) {
-                scheduleRefresh(task);
-            }
-        });
     }
 
     public void scheduleRefresh(Task task) {

src/main/java/org/tasks/sync/SyncExecutor.java

@@ -39,9 +39,7 @@ public class SyncExecutor {
     }
 
     private Runnable wrapWithExceptionHandling(final SyncResultCallback callback, final Runnable command) {
-        return new Runnable() {
+        return () -> {
-            @Override
-            public void run() {
             try {
                 command.run();
             } catch (Exception e) {
@@ -50,7 +48,6 @@ public class SyncExecutor {
                 executor.shutdownNow();
                 callback.finished();
             }
-            }
         };
     }
 }

src/main/java/org/tasks/ui/CalendarControlSet.java

@@ -217,13 +217,10 @@ public class CalendarControlSet extends TaskEditControlFragment {
             clear();
         } else {
             dialogBuilder.newMessageDialog(R.string.delete_calendar_event_confirmation)
-                    .setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
+                    .setPositiveButton(R.string.delete, (dialog, which) -> {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
                         if (permissionRequestor.requestCalendarPermissions(REQUEST_CODE_CLEAR_EVENT)) {
                             clear();
                         }
-                        }
                     })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();