android之HandlerThread類的實現

package com.ghg.HandlerThread;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
/**
 * 在主線程main中創建handler對象，創建消息，並用handler向工作線程發送消息，在工作線程中處理消息；
 * 應用環境：比如下載；
 * @author gaohong
 *
 */
public class Day1304_HandlerThreadActivity extends Activity {
	HandlerThread thread;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //創建工作線程並啓動（工作線程帶消息隊列）
         thread=new HandlerThread("workThread");
        thread.start();
        Looper looper=thread.getLooper();
        
        //創建Handler對象並與工作線程的消息隊列關聯
        Handler handler=new Handler(looper){
        	@Override
        	public void handleMessage(Message msg) {
        		// TODO Auto-generated method stub
        		System.out.println("在"+Thread.currentThread().getName()+"中處理消息");
        		System.out.println("msg.obj="+msg.obj);
        	}
        };
        
        //創建Message對象
        Message msg=Message.obtain();
        msg.obj="在"+Thread.currentThread().getName()+"線程中發送消息";
        handler.sendMessage(msg);
    }
    
   @Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		thread.quit();
	}
}

上面類是HandlerThread類的精簡版，模仿HandlerThread類的實現，關鍵是爲了理解HandlerThread類的工作原理；