code: public MessageListResult getUserMessagesByCursor(String username, String cursor)
              throws APIConnectionException, APIRequestException {
          return _messageClient.getUserMessagesByCursor(username, cursor);
      }
docs: Get user's message list with cursor, the cursor will effective in 120 seconds.
  And will return same count of messages as first request.
  @param username Necessary parameter.
  @param cursor First request will return cursor
  @return MessageListResult
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception