Send a notification when the app is closed

Question

How is it possible to send a notification programmatically, when the App got completely closed?

Example: The User closed the App, also in the Android Taskmanager, and waits. The App should send a notification after X Seconds or when the App check for Updates.

I tried to work with these code examples but:

• Pushing notifications when app is closed - too many Activities/doesn't work
• How do I get my app to send a notification when it is closed? - much information, but I don't know how to deal with it
• How to send local notification android when app is closed? - much information, but I don't know how to deal with it

If you can, try to explain it at an example, because beginners (like me) can easier learn it this way.

Answer 1

You can use this service all you need to do is Start this service onStop() in your activity lifecycle. With this code: startService(new Intent(this, NotificationService.class)); then you can create a new Java Class and paste this code in it:

public class NotificationService extends Service {      Timer timer;     TimerTask timerTask;     String TAG = "Timers";     int Your_X_SECS = 5;       @Override     public IBinder onBind(Intent arg0) {         return null;     }      @Override     public int onStartCommand(Intent intent, int flags, int startId) {         Log.e(TAG, "onStartCommand");         super.onStartCommand(intent, flags, startId);          startTimer();          return START_STICKY;     }       @Override     public void onCreate() {         Log.e(TAG, "onCreate");       }      @Override     public void onDestroy() {         Log.e(TAG, "onDestroy");         stoptimertask();         super.onDestroy();       }      //we are going to use a handler to be able to run in our TimerTask     final Handler handler = new Handler();       public void startTimer() {         //set a new Timer         timer = new Timer();          //initialize the TimerTask's job         initializeTimerTask();          //schedule the timer, after the first 5000ms the TimerTask will run every 10000ms         timer.schedule(timerTask, 5000, Your_X_SECS * 1000); //         //timer.schedule(timerTask, 5000,1000); //     }      public void stoptimertask() {         //stop the timer, if it's not already null         if (timer != null) {             timer.cancel();             timer = null;         }     }      public void initializeTimerTask() {          timerTask = new TimerTask() {             public void run() {                  //use a handler to run a toast that shows the current timestamp                 handler.post(new Runnable() {                     public void run() {                          //TODO CALL NOTIFICATION FUNC                         YOURNOTIFICATIONFUNCTION();                      }                 });             }         };     } } 

After this you only need to combine the service with the manifest.xml:

<service             android:name=".NotificationService"             android:label="@string/app_name">             <intent-filter>                 <action android:name="your.app.domain.NotificationService" />                  <category android:name="android.intent.category.DEFAULT" />             </intent-filter>         </service> 

Answer 2

You can use alarm manager to do this [Not tested on latest Android versions and releases and is a pretty old answer]. Follow below steps :

1. Use alarmmanager to create an alarm of after X seconds.

   Intent intent = new Intent(this, AlarmReceiver.class); intent.putExtra("NotificationText", "some text"); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, ledgerId, intent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager alarmManager = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE); alarmManager.set(AlarmManager.RTC_WAKEUP, 'X seconds in milliseconds', pendingIntent);

2. Use a AlarmBroadCast receiver in your app.

Declare in manifest file :

<receiver android:name=".utils.AlarmReceiver">
    <intent-filter>
        <action android:name="android.media.action.DISPLAY_NOTIFICATION" />

        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</receiver>

3. In the broadcast receiver's on receive, you can create the notification.

   public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // create notification here
    }
   

   }