@Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    if (activity instanceof ParseOnLoginSuccessListener) {
      onLoginSuccessListener = (ParseOnLoginSuccessListener) activity;
    } else {
      throw new IllegalArgumentException("Activity must implemement ParseOnLoginSuccessListener");
    }

    if (activity instanceof ParseOnLoadingListener) {
      onLoadingListener = (ParseOnLoadingListener) activity;
    } else {
      throw new IllegalArgumentException("Activity must implemement ParseOnLoadingListener");
    }
  }
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
 }