Android Handler

直接使用Handler，hander並不會啓動新線程，通過HandlerThread實現新線程的啓動。

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);
		//打印了當前線程的ID
		System.out.println("Activity-->" + Thread.currentThread().getId());
		//生成一個HandlerThread對象，實現了使用Looper來處理消息隊列的功能，這個類由Android應用程序框架提供
		HandlerThread handlerThread = new HandlerThread("handler_thread");
		//在使用HandlerThread的getLooper()方法之前，必須先調用該類的start();
		handlerThread.start();
		MyHandler myHandler = new MyHandler(handlerThread.getLooper());
		Message msg = myHandler.obtainMessage();
		//將msg發送到目標對象，所謂的目標對象，就是生成該msg對象的handler對象
		Bundle b = new Bundle();
		b.putInt("age", 20);
		b.putString("name", "Jhon");
		msg.setData(b);
		msg.sendToTarget();
	}

	//繼承Handler類，
	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);

		}
	}
}