HandlerThread分线程启动handler

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;

public class MainActivity extends Activity{


	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 打印UI线程的名称
		System.out.println("onCreate  CurrentThread = "
				+ Thread.currentThread().getName());

		setContentView(R.layout.activity_main);

		// 实现了使用Looper来处理消息队列的功能
		HandlerThread handler = new HandlerThread("handler_Thread");
		handler.start();
		MyHandler myHandler = new MyHandler(handler.getLooper());
		Message msg = myHandler.obtainMessage();
		msg.obj = "abc";
		Bundle data = new Bundle();
		data.putString("title", "你好吗");
		data.putString("info", "哈哈哈哈");
		msg.setData(data);
		// 将msg发送到对象，所谓的目标对象就是生成该msg对象的Handler对象
		msg.sendToTarget();

	}

	class MyHandler extends Handler {
		public MyHandler() {

		}

		public MyHandler(Looper looper) {
			super(looper);
		}

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			String s = (String) msg.obj;
			Bundle data = msg.getData();
			String title=data.getString("title");
			String info=data.getString("info");   
            System.out.println("title is " + title + ", info is" + info);  
            System.out.println("msg.obj is " + s);  
			System.out.println(Thread.currentThread().getId());
			System.out.println("handlerMessage");
		}

	}
}

　　HandlerThread继承与Thread，所以本身就是一个线程。他类似于创建了一个含有Looper对象的线程类，而Looper可以用于创建Handler类，这样我们就不用自己实例化Looper对象，调用preare和Loop了，而是直接调用HandlerThread。与普通的Thread相比，就是多了Looper对象。