@Override
 public void onServiceConnected(ComponentName name, IBinder service) {
   notify = NotificationServiceInterface.Stub.asInterface(service);
   while (callbacks.size() > 0) {
     ServiceCallback callback = callbacks.remove();
     callback.run(notify);
   }
 }
 public void call(ServiceCallback callback) {
   if (notify != null) {
     callback.run(notify);
   } else {
     callbacks.offer(callback);
   }
 }