How to automatically restart a service even if user force close it?

Question

I want a service to run all the time in my application. So I want to restart it even if it is force closed by user. There is definitely a way to do it as apps like facebook

Answer 1

You have to create a sticky service with overriding onTaskRemoved method, where you can set an alarm service to trigger your code again.

public class BackgroundService extends Service {

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    @Override
    public void onTaskRemoved(Intent rootIntent) {
        //create an intent that you want to start again.
        Intent intent = new Intent(getApplicationContext(), BackgroundService.class);
        PendingIntent pendingIntent = PendingIntent.getService(this, 1, intent, PendingIntent.FLAG_ONE_SHOT);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime() + 5000, pendingIntent);
        super.onTaskRemoved(rootIntent);
    }
}

Also in some devices like Xiaomi, Huwaei the app gets force closed once it's removed from recent apps. This is because the manufacturers have task manager features which improve ram/battery performance.

You can check this link for more information: https://stackoverflow.com/a/41360159/2798289