mars老师《Android开发视频教程》_01_15 handler的使用（二）视频源码-优快云博客

本文详细解析Android应用中如何利用Handler与线程进行高效的消息传递与处理，通过实例展示了在新线程中处理消息的方法，并深入探讨了Handler与线程之间的密切关系。

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主要内容：

1.Handler与线程

2.Bundle的用法

3.在新线程中处理消息的方法

创建项目：HandlerTest2

=>>HandlerTest.java

package mars.handler;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;

public class HandlerTest extends Activity {
	private Handler handler = new Handler();
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// sendMessage();
		//handler.post(r);
		setContentView(R.layout.main);
		Thread t = new Thread(r);
		t.start();
		System.out.println("activity--->" + Thread.currentThread().getId());
		System.out.println("activityname--->" + Thread.currentThread().getName());
	}
	
	Runnable r = new Runnable(){

		@Override
		public void run() {
			// TODO Auto-generated method stub
			System.out.println("handler--->" + Thread.currentThread().getId());
			System.out.println("handlername--->" + Thread.currentThread().getName());
			try {
				Thread.sleep(10000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	};

}

=>>HandlerTest2.java

package mars.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 HandlerTest2 extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		//打印了当前线程的ID
		System.out.println("Activity-->" + Thread.currentThread().getId());
		//生成一个HandlerThread对象，实现了使用Looper来处理消息队列的功能，这个类由Android应用程序框架提供
		HandlerThread handlerThread = new HandlerThread("handler_thread");
		//在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();
		handlerThread.start();
		MyHandler myHandler = new MyHandler(handlerThread.getLooper());
		Message msg = myHandler.obtainMessage();
		//将msg发送到目标对象，所谓的目标对象，就是生成该msg对象的handler对象
		Bundle b = new Bundle();
		b.putInt("age", 20);
		b.putString("name", "Jhon");
		msg.setData(b);
		msg.sendToTarget();
	}
	
	class MyHandler extends Handler{
		public MyHandler(){
			
		}
		public MyHandler(Looper looper){
			super(looper);
		}
		@Override
		public void handleMessage(Message msg) {
			Bundle b = msg.getData();
			int age = b.getInt("age");
			String name = b.getString("name");
			System.out.println("age is " + age + ", name is" + name);
			System.out.println("Handler--->" + Thread.currentThread().getId());
			System.out.println("handlerMessage");
		}
	}
}