HandlerThread的使用_customhandlerthread-优快云博客

本文链接：https://blog.youkuaiyun.com/zouchengxufei/article/details/20688859

本文详细介绍了HandlerThread的使用方式，包括其构造、启动、Looper的初始化以及如何在内部创建Handler类。通过示例代码展示了如何在实际项目中运用HandlerThread，包括发送消息和异步任务的处理。

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HandlerThread其实是Thread 的一个子类，官方给的解释是

Handy class for starting a new thread that has a looper. The looper can then be used to create handler classes. Note that start() must still be called.
其实是为启动一个具有Looper的线程而写的类，这个looper 能够用于创建一个Handler类，注意start()方法必须被调用。

详细说明见官网：http://developer.android.com/reference/android/os/HandlerThread.html

参考其他人资料：http://blog.youkuaiyun.com/wanglong0537/article/details/6304239

Demo :

public class MyHandlerThread extends HandlerThread {
	private static final String TAG = "MyHandlerThread";
	private Handler mHandler;


	public MyHandlerThread(String name) {
		super(name);
	}
	
	public Handler getHandler() {
		return mHandler;
	}


	@Override
	public void start() {
		super.start();
		Looper looper = getLooper(); // will block until Looper is initialized
		mHandler = new Handler(looper) {
			@Override
			public void handleMessage(Message msg) {
				switch (msg.what) {
				// process messages here
				}
			}
		};
	}
}

调用该类时的demo片段：

	MyHandlerThread thread = new MyHandlerThread("handler thread");
        thread.start();
        
        // later...
        Handler handler = thread.getHandler(); // careful: this could return null if the handler is not initialized yet
        
        // to post a runnable
        handler.post(new Runnable() {
            public void run() {
                Log.i(TAG, "Where am I? " + Thread.currentThread().getName());
            }
        });
        
        // to send a message
        int what = 0; // define your own values
        int arg1 = 1;
        int arg2 = 2;
        Message msg = Message.obtain(handler, what, arg1, arg2);
        handler.sendMessage(msg);