Add observe method to view models

app/src/main/java/org/tasks/activities/GoogleTaskListSettingsActivity.java

@@ -144,20 +144,9 @@ public class GoogleTaskListSettingsActivity extends ThemedInjectingAppCompatActi
         || deleteListViewModel.inProgress()) {
       showProgressIndicator();
     }
-    createListViewModel.getData().observe(this, this::onListCreated);
-    renameListViewModel.getData().observe(this, this::onListRenamed);
-    deleteListViewModel
-        .getData()
-        .observe(
-            this,
-            deleted -> {
-              if (deleted) {
-                onListDeleted();
-              }
-            });
-    createListViewModel.getError().observe(this, this::requestFailed);
-    renameListViewModel.getError().observe(this, this::requestFailed);
-    deleteListViewModel.getError().observe(this, this::requestFailed);
+    createListViewModel.observe(this, this::onListCreated, this::requestFailed);
+    renameListViewModel.observe(this, this::onListRenamed, this::requestFailed);
+    deleteListViewModel.observe(this, this::onListDeleted, this::requestFailed);
   }
 
   private void showProgressIndicator() {
@@ -256,7 +245,8 @@ public class GoogleTaskListSettingsActivity extends ThemedInjectingAppCompatActi
     dialogBuilder
         .newMessageDialog(R.string.delete_tag_confirmation, gtasksList.getTitle())
         .setPositiveButton(
-            R.string.delete, (dialog, which) -> {
+            R.string.delete,
+            (dialog, which) -> {
               showProgressIndicator();
               deleteListViewModel.deleteList(context, gtasksList);
             })
@@ -320,11 +310,13 @@ public class GoogleTaskListSettingsActivity extends ThemedInjectingAppCompatActi
     finish();
   }
 
-  private void onListDeleted() {
-    tracker.reportEvent(Tracking.Events.GTASK_DELETE_LIST);
-    taskDeleter.delete(gtasksList);
-    setResult(RESULT_OK, new Intent(TaskListFragment.ACTION_DELETED));
-    finish();
+  private void onListDeleted(boolean deleted) {
+    if (deleted) {
+      tracker.reportEvent(Tracking.Events.GTASK_DELETE_LIST);
+      taskDeleter.delete(gtasksList);
+      setResult(RESULT_OK, new Intent(TaskListFragment.ACTION_DELETED));
+      finish();
+    }
   }
 
   private void onListRenamed(TaskList taskList) {

app/src/main/java/org/tasks/caldav/CaldavAccountSettingsActivity.java

@@ -150,10 +150,8 @@ public class CaldavAccountSettingsActivity extends ThemedInjectingAppCompatActiv
       imm.showSoftInput(name, InputMethodManager.SHOW_IMPLICIT);
     }
 
-    addCaldavAccountViewModel.getData().observe(this, this::addAccount);
-    updateCaldavAccountViewModel.getData().observe(this, this::updateAccount);
-    addCaldavAccountViewModel.getError().observe(this, this::requestFailed);
-    updateCaldavAccountViewModel.getError().observe(this, this::requestFailed);
+    addCaldavAccountViewModel.observe(this, this::addAccount, this::requestFailed);
+    updateCaldavAccountViewModel.observe(this, this::updateAccount, this::requestFailed);
   }
 
   private void showProgressIndicator() {

app/src/main/java/org/tasks/caldav/CaldavCalendarSettingsActivity.java

@@ -159,10 +159,8 @@ public class CaldavCalendarSettingsActivity extends ThemedInjectingAppCompatActi
       imm.showSoftInput(name, InputMethodManager.SHOW_IMPLICIT);
     }
 
-    createCalendarViewModel.getData().observe(this, this::createSuccessful);
-    deleteCalendarViewModel.getData().observe(this, this::onDeleted);
-    createCalendarViewModel.getError().observe(this, this::requestFailed);
-    deleteCalendarViewModel.getError().observe(this, this::requestFailed);
+    createCalendarViewModel.observe(this, this::createSuccessful, this::requestFailed);
+    deleteCalendarViewModel.observe(this, this::onDeleted, this::requestFailed);
   }
 
   @Override

app/src/main/java/org/tasks/ui/ActionViewModel.java

@@ -2,8 +2,9 @@ package org.tasks.ui;
 
 import static com.todoroo.andlib.utility.AndroidUtilities.assertMainThread;
 
-import androidx.lifecycle.LiveData;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModel;
 import io.reactivex.Completable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -17,12 +18,12 @@ public class ActionViewModel extends ViewModel {
   private final CompositeDisposable disposables = new CompositeDisposable();
   private boolean inProgress;
 
-  public LiveData<Boolean> getData() {
-    return completed;
-  }
-
-  public LiveData<Throwable> getError() {
-    return error;
+  public void observe(
+      LifecycleOwner lifecycleOwner,
+      Observer<Boolean> completeObserver,
+      Observer<Throwable> errorObserver) {
+    completed.observe(lifecycleOwner, completeObserver);
+    error.observe(lifecycleOwner, errorObserver);
   }
 
   public boolean inProgress() {

app/src/main/java/org/tasks/ui/CompletableViewModel.java

@@ -2,8 +2,9 @@ package org.tasks.ui;
 
 import static com.todoroo.andlib.utility.AndroidUtilities.assertMainThread;
 
-import androidx.lifecycle.LiveData;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModel;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -17,12 +18,10 @@ public abstract class CompletableViewModel<T> extends ViewModel {
   private final CompositeDisposable disposables = new CompositeDisposable();
   private boolean inProgress;
 
-  public LiveData<T> getData() {
-    return data;
-  }
-
-  public LiveData<Throwable> getError() {
-    return error;
+  public void observe(
+      LifecycleOwner lifecycleOwner, Observer<T> dataObserver, Observer<Throwable> errorObserver) {
+    data.observe(lifecycleOwner, dataObserver);
+    error.observe(lifecycleOwner, errorObserver);
   }
 
   public boolean inProgress() {