@Override
 public int onStartCommand(Intent intent, int flags, int startId) {
   if (!ReceiverService.running()) {
     startReceiving();
   }
   return Service.START_STICKY;
 }
 @Override
 public void onDestroy() {
   Log.i(TAG, "onDestroy()");
   if (ReceiverService.running()) {
     stopReceiving();
   }
   toast("Message receiver stopped");
   super.onDestroy();
 }