code: public MemberListResult getCrossGroupMembers(long gid)
              throws APIConnectionException, APIRequestException {
          Preconditions.checkArgument(0 != gid, "gid must not be empty");
          ResponseWrapper response = _httpClient.sendGet(_baseUrl + crossGroupPath + "/" + gid + "/members/");
          return MemberListResult.fromResponse(response);
      }
docs: Get members' info from cross group
  @param gid Necessary, target group id
  @return Member info array
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception