@Override
 protected String doInBackground(Void... params) {
   String inviteURL = "user/acceptinvite?msg_id=" + m_msgID;
   return NetworkUtil.getRequestAPI(inviteURL);
 }
 @Override
 protected String doInBackground(Void... params) {
   String meetingURL = "meeting/get?meeting_id=" + m_meetingID;
   return NetworkUtil.getRequestAPI(meetingURL);
 }