java - 如何获取多用户聊天昵称的 Jabber ID

Question

我正在尝试获取多用户聊天中昵称的 Jabber ID，但以下代码仅返回 null:

class JabberMUCMessageListenerAdapter implements PacketListener {

    private final MultiUserChat muc;

    public JabberMUCMessageListenerAdapter(MultiUserChat muc) {
         this.muc = muc;
    }

    @Override
    public void processPacket(Packet p) {
        if (p instanceof Message) {

            final Message msg = (Message) p;

            String jid = muc.getOccupant(msg.getFrom()).getJid(); // returns null

            ...
        }
    }
}

有人知道我做错了什么吗？

Answer 1

http://www.igniterealtime.org/builds/smack/docs/latest/javadoc/org/jivesoftware/smackx/muc/Occupant.html

The full JID and nickname are optional.