设置管理员

SetGroupMemberInfo update = new SetGroupMemberInfo();
update.setGroupID("group_123");
update.setUserID("user_b");
update.setRoleLevel(GroupRole.ADMIN);

OpenIMClient.getInstance().groupManager.setGroupMemberInfo(
    update,
    new OnBase<String>() {
        @Override
        public void onSuccess(String data) {
            // 角色修改成功
        }

        @Override
        public void onError(int code, String error) {
            // 处理修改失败
        }
    }
);