private void initOfflinePref() {
   User user = YftData.data().getMe();
   if (null != user && user.getShopId() > 0) {
     YftData.data()
         .setOffPref(
             getSharedPreferences(
                 getString(R.string.preference_offline) + user.getShopId(), Context.MODE_PRIVATE));
   }
 }