How Can I getAllRoomMembersJid with the role of anyone

Hi,
I have used the version of smack is 4.1.6,when I create a room, i have set // 能够发现成员真实 JID 的角色
List memTypeList = new ArrayList<>();
memTypeList.add(“anyone”);
submitForm.setAnswer(“muc#roomconfig_whois”, memTypeList);
but i don’t know how to get membersJid of the room(all members contain offline member that joined the room) i have joined,the role of anyone,Can you help me?
Thanks!