在android系统消息队列 [英] Message queue in android

问题描述

有谁能够告诉我，
怎样才能从消息队列中的数据（消息）？
或如何从主线程发送消息给其他线程？

can anybody tell me, how can get data(message) from message queue ? or how can send message from main thread to other thread ?.

感谢

推荐答案

如果你想你应该运行的Looper 并创建绑定到此尺蠖的消息处理器 。在UI线程默认有一个活套。还有用于创建与勾针称为 HandlerThread 线程便捷类。下面是关于处理程序和活套的好文章： Android的胆量：简介活套和处理程序。

If you want to receive messages on a thread you should run a Looper and create a message Handler bound to this looper. The UI thread has a looper by default. There's a convenient class for creating threads with loopers called HandlerThread. Here's a good article about Handlers and Loopers: Android Guts: Intro to Loopers and Handlers.

修改

HandlerThread thread = new HandlerThread("Thread name");
thread.start();

Looper looper = thread.getLooper();
Handler handler = new Handler(looper) {
    @Override
    public void handleMessage(Message msg) {
        switch(msg.what) {
            case SOME_MESSAGE_ID:
                // SOME_MESSAGE_ID is any int value
                // do something
                break;
            // other cases
        }
    }
};

handler.post(new Runnable() {
    @Override
    public void run() {
        // this code will be executed on the created thread
    }
});

// Handler.handleMessage() will be executed on the created thread
// after the previous Runnable is finished
handler.sendEmptyMessage(SOME_MESSAGE_ID);

这篇关于在android系统消息队列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！