diff --git a/app/src/main/java/org/tasks/reminders/NotificationActivity.java b/app/src/main/java/org/tasks/reminders/NotificationActivity.java
deleted file mode 100644
index c05573361..000000000
--- a/app/src/main/java/org/tasks/reminders/NotificationActivity.java
+++ /dev/null
@@ -1,110 +0,0 @@
-package org.tasks.reminders;
-
-import android.content.Context;
-import android.content.Intent;
-import android.os.Bundle;
-import androidx.fragment.app.FragmentManager;
-import com.todoroo.astrid.dao.TaskDaoBlocking;
-import dagger.hilt.android.AndroidEntryPoint;
-import io.reactivex.Single;
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.disposables.CompositeDisposable;
-import io.reactivex.schedulers.Schedulers;
-import javax.inject.Inject;
-import org.tasks.injection.InjectingAppCompatActivity;
-import org.tasks.intents.TaskIntents;
-import org.tasks.notifications.NotificationManager;
-import org.tasks.receivers.CompleteTaskReceiver;
-import org.tasks.themes.ThemeAccent;
-import timber.log.Timber;
-
-@AndroidEntryPoint
-public class NotificationActivity extends InjectingAppCompatActivity
-    implements NotificationDialog.NotificationHandler {
-
-  public static final String EXTRA_TITLE = "extra_title";
-  public static final String EXTRA_TASK_ID = "extra_task_id";
-  private static final String FRAG_TAG_NOTIFICATION_FRAGMENT = "frag_tag_notification_fragment";
-  @Inject NotificationManager notificationManager;
-  @Inject TaskDaoBlocking taskDao;
-  @Inject ThemeAccent themeAccent;
-
-  public static Intent newIntent(Context context, String title, long id) {
-    Intent intent = new Intent(context, NotificationActivity.class);
-    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-    intent.putExtra(NotificationActivity.EXTRA_TASK_ID, id);
-    intent.putExtra(NotificationActivity.EXTRA_TITLE, title);
-    return intent;
-  }
-
-  private long taskId;
-  private CompositeDisposable disposables;
-
-  @Override
-  protected void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-
-    themeAccent.applyStyle(getTheme());
-
-    Intent intent = getIntent();
-
-    taskId = intent.getLongExtra(EXTRA_TASK_ID, 0L);
-
-    FragmentManager fragmentManager = getSupportFragmentManager();
-    NotificationDialog fragment =
-        (NotificationDialog) fragmentManager.findFragmentByTag(FRAG_TAG_NOTIFICATION_FRAGMENT);
-    if (fragment == null) {
-      fragment = new NotificationDialog();
-      fragment.show(fragmentManager, FRAG_TAG_NOTIFICATION_FRAGMENT);
-    }
-    fragment.setTitle(intent.getStringExtra(EXTRA_TITLE));
-  }
-
-  @Override
-  public void dismiss() {
-    finish();
-  }
-
-  @Override
-  protected void onResume() {
-    super.onResume();
-
-    disposables = new CompositeDisposable();
-  }
-
-  @Override
-  protected void onPause() {
-    super.onPause();
-
-    disposables.dispose();
-  }
-
-  @Override
-  public void edit() {
-    notificationManager.cancel(taskId);
-    disposables.add(
-        Single.fromCallable(() -> taskDao.fetchBlocking(taskId))
-            .subscribeOn(Schedulers.io())
-            .observeOn(AndroidSchedulers.mainThread())
-            .subscribe(
-                task -> {
-                  startActivity(TaskIntents.getEditTaskIntent(this, null, task));
-                  finish();
-                },
-                e -> Timber.e("Task not found: %s", taskId)));
-  }
-
-  @Override
-  public void snooze() {
-    finish();
-    startActivity(SnoozeActivity.newIntent(this, taskId));
-  }
-
-  @Override
-  public void complete() {
-    Intent intent = new Intent(this, CompleteTaskReceiver.class);
-    intent.putExtra(CompleteTaskReceiver.TASK_ID, taskId);
-    sendBroadcast(intent);
-    finish();
-  }
-}
diff --git a/app/src/main/java/org/tasks/reminders/NotificationActivity.kt b/app/src/main/java/org/tasks/reminders/NotificationActivity.kt
new file mode 100644
index 000000000..64e23ad11
--- /dev/null
+++ b/app/src/main/java/org/tasks/reminders/NotificationActivity.kt
@@ -0,0 +1,96 @@
+package org.tasks.reminders
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import com.todoroo.astrid.dao.TaskDaoBlocking
+import com.todoroo.astrid.data.Task
+import dagger.hilt.android.AndroidEntryPoint
+import io.reactivex.Single
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.CompositeDisposable
+import io.reactivex.schedulers.Schedulers
+import org.tasks.injection.InjectingAppCompatActivity
+import org.tasks.intents.TaskIntents
+import org.tasks.notifications.NotificationManager
+import org.tasks.receivers.CompleteTaskReceiver
+import org.tasks.themes.ThemeAccent
+import timber.log.Timber
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class NotificationActivity : InjectingAppCompatActivity(), NotificationDialog.NotificationHandler {
+    @Inject lateinit var notificationManager: NotificationManager
+    @Inject lateinit var taskDao: TaskDaoBlocking
+    @Inject lateinit var themeAccent: ThemeAccent
+
+    private var taskId: Long = 0
+    private var disposables: CompositeDisposable? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        themeAccent.applyStyle(theme)
+        val intent = intent
+        taskId = intent.getLongExtra(EXTRA_TASK_ID, 0L)
+        val fragmentManager = supportFragmentManager
+        var fragment = fragmentManager.findFragmentByTag(FRAG_TAG_NOTIFICATION_FRAGMENT) as NotificationDialog?
+        if (fragment == null) {
+            fragment = NotificationDialog()
+            fragment.show(fragmentManager, FRAG_TAG_NOTIFICATION_FRAGMENT)
+        }
+        fragment.setTitle(intent.getStringExtra(EXTRA_TITLE))
+    }
+
+    override fun dismiss() {
+        finish()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        disposables = CompositeDisposable()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        disposables!!.dispose()
+    }
+
+    override fun edit() {
+        notificationManager.cancel(taskId)
+        disposables!!.add(
+                Single.fromCallable { taskDao.fetchBlocking(taskId) }
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe(
+                                { task: Task? ->
+                                    startActivity(TaskIntents.getEditTaskIntent(this, null, task))
+                                    finish()
+                                }
+                        ) { Timber.e("Task not found: $taskId") })
+    }
+
+    override fun snooze() {
+        finish()
+        startActivity(SnoozeActivity.newIntent(this, taskId))
+    }
+
+    override fun complete() {
+        val intent = Intent(this, CompleteTaskReceiver::class.java)
+        intent.putExtra(CompleteTaskReceiver.TASK_ID, taskId)
+        sendBroadcast(intent)
+        finish()
+    }
+
+    companion object {
+        const val EXTRA_TITLE = "extra_title"
+        const val EXTRA_TASK_ID = "extra_task_id"
+        private const val FRAG_TAG_NOTIFICATION_FRAGMENT = "frag_tag_notification_fragment"
+        fun newIntent(context: Context?, title: String?, id: Long): Intent {
+            val intent = Intent(context, NotificationActivity::class.java)
+            intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+            intent.putExtra(EXTRA_TASK_ID, id)
+            intent.putExtra(EXTRA_TITLE, title)
+            return intent
+        }
+    }
+}
\ No newline at end of file