@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
   if (resultCode == RESULT_OK && requestCode == LOGIN_REQUEST) {
     Bundle bundle = data.getExtras();
     String username = bundle.getString(Constants.USERNAME);
     String token = bundle.getString(Constants.TOKEN);
     SPUtils.put(this.getApplicationContext(), Constants.TOKEN, token);
     SPUtils.put(this.getApplicationContext(), Constants.USERNAME, username);
     app.user = new User(username, token);
     menu_login.setText(username);
   }
   super.onActivityResult(requestCode, resultCode, data);
 }
 private void clearUserInfo() {
   SPUtils.remove(this.getApplicationContext(), Constants.USERNAME);
   SPUtils.remove(this.getApplicationContext(), Constants.TOKEN);
   app.user = null;
 }