code: public ResponseWrapper addOrRemoveCrossGroupMember(long gid, CrossGroup[] groups)
              throws APIConnectionException, APIRequestException {
          return _crossAppClient.addOrRemoveCrossGroupMembers(gid, groups);
      }
docs: Add or remove group members from a given group id.
  @param gid Necessary, target group id.
  @param groups Necessary
  @return No content
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception