Need code example on how to run an Android service forever in the background even when device sleeping, like Whatsapp?

Question

I have tried various ways to achieve this, but my service eventually gets killed.

I want to use AlarmManager to trigger a class every one hour. Even if the device is

Answer 1

It is very simple.
steps:
1.create a Service class.
2.create a BroadcastReceiver class
3.call BroadReceiver in onDestroy method of service
4.In onReceive method of BroadReceiver class start service once again.

Here's the code

Manifest file:`

`

Service class

public class NotificationService extends Service {
    public NotificationService() {
    }

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

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

   @Override
   public void onDestroy() {
       super.onDestroy();
       Intent restartService = new Intent("RestartService");
       sendBroadcast(restartService);
  }
}

BroadcastReceiver class

public class RestartService extends BroadcastReceiver {

     @Override
     public void onReceive(Context context, Intent intent) {

         context.startService(new Intent(context,NotificationService.class));
     }
 }