/** Hook method called when the last client unbinds from the Service. */
  @Override
  public void onDestroy() {
    super.onDestroy();

    // Shutdown the RequestHandler.
    // TODO -- you fill in here.
  }
 /** Factory method that returns the underlying IBinder associated with the Request Messenger. */
 @Override
 public IBinder onBind(Intent intent) {
   super.onBind(intent);
   // Return the iBinder associated with the Request Messenger.
   return mRequestMessenger.getBinder();
 }