Question

我使用asmack 4.0.5在Android上构建了一个小型XMPP应用程序。我想实现聊天伙伴的在线状态。我可以在Eclipse中使用logging-function获取信息，但我无法在Chatting-UI上显示/更新它。我有2个监听器：PacketListener表示传入的消息和RosterListener能够接收状态，但无法在UI上显示。 PacketListener以这种方式构建：

PacketFilter filter = new MessageTypeFilter(Message.Type.chat);
        connection.addPacketListener(new PacketListener() {
            @Override
            public void processPacket(Packet packet) {
                message = (Message) packet;
                if (message.getBody() != null) {
                    String fromName = StringUtils.parseBareAddress(message
                            .getFrom());
                    messages.add(message.getBody());
                    listMessage.add(new MessageData(message.getBody()));                        
                    mHandler.post(new Runnable() {
                        @SuppressLint("NewApi")
                        public void run() {
 //listview = chatmessages which are updated every time I receive a message
                                listview.invalidateViews();
                            }
                        });
                    }
                }
            }, filter);

然后我得到了RosterListener：

final Roster roster = connection.getRoster();
roster.addRosterListener(new RosterListener() {
    @Override
    public void presenceChanged(final Presence presence) {
        presenceUser = presence.getFrom();
        Presence availability = roster.getPresence(presenceUser);
        Mode userMode = availability.getMode();
        availableMode.setText(getPresenceStatus(...)); // Here is where a TextView 'availableMode' should be updated, but I get the Error shown below.
    }

    @Override
    public void entriesUpdated(Collection<String> arg0) {
    }

    @Override
    public void entriesDeleted(Collection<String> arg0) {
    }

    @Override
    public void entriesAdded(Collection<String> arg0) {
    }
});

每当我的RosterListener想要更新UI时，我都会遇到以下异常：

   E/XMPPConnection(1314): Exception in packet listener
   E/XMPPConnection(1314):android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

如何使用RosterListener中的传入状态信息独立更新UI？

Answer 1

在runnable中包装availableMode.setText(getPresenceStatus(...));，然后使用post(…)在UI线程上进行UI更新。

http://developer.android.com/reference/android/view/View.html#post(java.lang.Runnable)

View＃post使Runnable添加到消息队列中。 runnable将在用户界面线程上运行。

availableMode.post(new Runnable() { @Override public void run() { availableMode.setText(getPresenceStatus(...)); } });

Android - XMPP asmack PacketListener抛出CalledFromWrongThreadException层次结构视图

1 个答案: