Android foreground service notification not showing

Question

I am trying to start a foreground service. I get notified that the service does start but the notification always gets suppressed. I double checked that the app is allowed to show notifications in the app info on my device. Here is my code:

private void showNotification() {     Intent notificationIntent = new Intent(this, MainActivity.class);     notificationIntent.setAction(Constants.ACTION.MAIN_ACTION);     notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK             | Intent.FLAG_ACTIVITY_CLEAR_TASK);     PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,             notificationIntent, 0);      Bitmap icon = BitmapFactory.decodeResource(getResources(),             R.mipmap.ic_launcher);      Notification notification = new NotificationCompat.Builder(getApplicationContext())             .setContentTitle("Revel Is Running")             .setTicker("Revel Is Running")             .setContentText("Click to stop")             .setSmallIcon(R.mipmap.ic_launcher)             //.setLargeIcon(Bitmap.createScaledBitmap(icon, 128, 128, false))             .setContentIntent(pendingIntent)             .setOngoing(true).build();     startForeground(Constants.FOREGROUND_SERVICE,             notification);     Log.e(TAG,"notification shown");  } 

Here is the only error I see in relation: 06-20 12:26:43.635 895-930/? E/NotificationService: Suppressing notification from the package by user request.

Answer 1

It's because of Android O bg services restrictions.

So now you need to call startForeground() only for services that were started with startForegroundService() and call it in first 5 seconds after service has been started.

Here is the guide - https://developer.android.com/about/versions/oreo/background#services

Like this:

//Start service: if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {   startForegroundService(new Intent(this, YourService.class)); } else {   startService(new Intent(this, YourService.class)); } 

Then create and show notification (with channel as supposed earlier):

private void createAndShowForegroundNotification(Service yourService, int notificationId) {      final NotificationCompat.Builder builder = getNotificationBuilder(yourService,          "com.example.your_app.notification.CHANNEL_ID_FOREGROUND", // Channel id     NotificationManagerCompat.IMPORTANCE_LOW); //Low importance prevent visual appearance for this notification channel on top      builder.setOngoing(true)     .setSmallIcon(R.drawable.small_icon)     .setContentTitle(yourService.getString(R.string.title))     .setContentText(yourService.getString(R.string.content));      Notification notification = builder.build();      yourService.startForeground(notificationId, notification);      if (notificationId != lastShownNotificationId) {           // Cancel previous notification           final NotificationManager nm = (NotificationManager) yourService.getSystemService(Activity.NOTIFICATION_SERVICE);           nm.cancel(lastShownNotificationId);     }     lastShownNotificationId = notificationId; }  public static NotificationCompat.Builder getNotificationBuilder(Context context, String channelId, int importance) {     NotificationCompat.Builder builder;     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {         prepareChannel(context, channelId, importance);         builder = new NotificationCompat.Builder(context, channelId);     } else {         builder = new NotificationCompat.Builder(context);     }     return builder; }  @TargetApi(26) private static void prepareChannel(Context context, String id, int importance) {     final String appName = context.getString(R.string.app_name);     String description = context.getString(R.string.notifications_channel_description);     final NotificationManager nm = (NotificationManager) context.getSystemService(Activity.NOTIFICATION_SERVICE);      if(nm != null) {         NotificationChannel nChannel = nm.getNotificationChannel(id);          if (nChannel == null) {             nChannel = new NotificationChannel(id, appName, importance);             nChannel.setDescription(description);             nm.createNotificationChannel(nChannel);         }     } } 

Remember that your foreground notification will have the same state as your other notifications even if you'll use different channel ids, so it might be hidden as a group with others. Use different groups to avoid it.