@Override
 protected String doInBackground(String... params) {
   return HttpManager.getEventPhotosData(params[0]);
 }
 @Override
 protected String doInBackground(RequestPackage... params) {
   HttpManager.uploadFile(params[0]);
   return null;
 }
 @Override
 protected String doInBackground(String... params) {
   return HttpManager.getEventDetail(
       userId, String.valueOf(eventDetail.getEventId()), "0", eventDetail.getEventCode());
 }