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Android Threads and Services But Wait There's More! Foreground Services

API 27 and up: App crash due to notification builder issues.

Just a heads up, on API 27 and up, my app crashes when attempting to build the notification, and says "invalid channel for service notification". Can we get an update in the teachers notes at the very least???

1 Answer

This worked for me : Also the permission is needed to be added.

public int onStartCommand(Intent intent, int flags, int startId) {

    String CHANNEL_ONE_ID = "com.app.N1";
    String CHANNEL_ONE_NAME = "Channel One";
    NotificationChannel notificationChannel = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        notificationChannel = new NotificationChannel(CHANNEL_ONE_ID,
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    Bitmap icon = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
    Notification notification = new Notification.Builder(getApplicationContext())
            .setContentTitle("My Notif")
            .setContentText("the notif")

    Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
    notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    notification.contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, 0);

    startForeground(11, notification);

    mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        public void onCompletion(MediaPlayer mediaPlayer) {
    return Service.START_NOT_STICKY;