Search group members

OpenIMClient.getInstance().groupManager.searchGroupMembers(
    new OnBase<List<GroupMembersInfo>>() {
        @Override public void onSuccess(List<GroupMembersInfo> members) { /* members contains the matches. */ }
        @Override public void onError(int code, String error) { /* code and error describe the failure. */ }
    }, groupID, Collections.singletonList(keyword), true, true, 0, 20);