Android MainThread（UI线程/主线程）与 WorkThread（主线程以外的线程）相互sendMessage

最新推荐文章于 2023-11-15 22:47:50 发布

原创最新推荐文章于 2023-11-15 22:47:50 发布 · 3.6k 阅读

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#android #handler #looper #android线程

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本文介绍如何在Android应用中实现主线程与工作线程之间的消息传递。通过创建Handler对象并配合Message使用，可以在不同线程间发送和接收消息。文章详细展示了如何从工作线程发送消息到主线程并在主线程更新UI，同时也介绍了如何反向操作。

WorkThread sendMessage to MainThread

private void SimpleThread() {
        final Handler handler = new Handler(){

            @Override
            public void handleMessage(Message msg) {
                Log.i("zht","msg.what" +msg.what);
            }

        };

        Runnable mRunnable = new Runnable() {
            @Override
            public void run() {
                Message msg = new Message();
                msg.what =102;
                handler.sendMessage(msg);

            }
        };
        Thread thread = new Thread(mRunnable);

        thread.start();
    }

MainThread sendMessage to workThread
在ui线程之外的线程里处理 message （handleMessage）
必须调用
Looper.prepare();
Looper.loop();

    Handler handler = null;
    private void SimpleThread() {

        Runnable mRunnable = new Runnable() {
            @Override
            public void run() {
                Looper.prepare();
                handler = new Handler() {
                    @Override
                    public void handleMessage(Message msg) {
                        Log.i("zht", "msg.what:" + msg.what);
                    }
                };
                Looper.loop();

            }
        };
        Thread thread = new Thread(mRunnable);

        thread.start();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Message msg = new Message();
        msg.what = 101;
        handler.sendMessage(msg);
    }