适当的离开一个聊天室在smack Android

Question

在我的应用中，我正在使用下面的方法离开聊天室。

 public void leaveChatRoom(String username)
{
    Log.i("XMPP Chat Client", "User left chat room ");
    if(groupChat != null && groupChat.isJoined())
    {
        try {
            Presence leavePresence = new Presence(Presence.Type.unavailable);
            leavePresence.setTo("groupchat@conference.xxx/" + username);
            connection.sendPacket(leavePresence);
            groupChat.leave();


        } catch (NotConnectedException e) {
            e.printStackTrace();
        }
    }

}

要检查用户是否已加入，

public boolean isJoinedGroup(String username)
    {
        boolean isConnected = false;
        if(groupChat != null && groupChat.isJoined())
        {
            isConnected = true;
            Log.i("XMPP Chat Client", "Joined True");
        }
        return isConnected;
}

如果有一个成功的聊天服务器连接，这是很好的。但在某些情况下，聊天服务器连接会丢失。在这种情况下，我必须让用户离开聊天室，并再次自动加入。因此，当我失去聊天服务器连接时，我将重新连接到聊天服务器，并一起调用leaveChatRoom方法和join group方法。我将NotConnectedException放在行groupChat.leave();中，当我检查joined状态时，它总是返回true。当我检查openfire管理面板时，群聊占居者列表中没有用户。在这种情况下，我如何正确地将用户从群聊中删除？

Answer 1

离开一个聊天室在smack Android - Kotlin

override fun leaveGroup(roomId: String, username: String) {
    if (connection.isConnectionEstablished()) {
        try {
            val mucJid = JidCreate.entityBareFrom("${roomId}.@conference.yourhost/${username}")
            val jid = JidCreate.from("${roomId}.@conference.yourhost/${username}")


            val manager = MultiUserChatManager.getInstanceFor(connection)
            val muc = manager.getMultiUserChat(mucJid)

            if (!muc.isJoined) {
                val nickName = Resourcepart.from(phone)
                muc.join(nickName)
            }


            val leavePresence = PresenceBuilder.buildPresence().ofType((Presence.Type.unavailable)).build()
            leavePresence.to = jid
            connection.sendStanza(leavePresence)
            muc.leave()

         
        } catch (e: NoResponseException) {
            e.printStackTrace()
        } catch (e: XMPPErrorException) {
            e.printStackTrace()
        } catch (e: NotConnectedException) {
            e.printStackTrace()
        }
    }
}