@Override
 protected void onPostExecute(Integer result) {
   super.onPostExecute(result);
   if (listener != null) {
     listener.onNetEnd(result, errMsg, method, isLoadMore);
   }
 }
 @Override
 protected void onPreExecute() {
   super.onPreExecute();
   if (listener != null) {
     listener.onNetBegin(method, isLoadMore);
   }
 }