Android Thread 与 Handler

package com.ltc.thread;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;public class ActivityMain extends Activity {    private TextView textView = null;private Button btn = null;private Thread thread = null;private Thread thread2 = null;public Handler handler;/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                findVeiws();        setListeners();    }        private void findVeiws(){    textView = (TextView)findViewById(R.id.mytextview);        btn = (Button)findViewById(R.id.actmain_btn_threadrun);    }        private void setListeners(){        btn.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v) {testThread();}});       }        private void testThread(){            thread = new Thread(new Runnable() {        @Overridepublic void run() {Thread.currentThread();int i = 0;while(i++ < 10){Log.e("LOG", "-------------"+i);Message msg = handler.obtainMessage();                    msg.arg1 = i;                    msg.sendToTarget();try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}}}});        thread.start();                handler = new Handler(){        @Override        public void handleMessage(Message msg) {        // TODO Auto-generated method stub                textView.setText(""+msg.arg1);                if(msg.arg1 == 1){        thread2 = new Thread(new Runnable() {@Overridepublic void run() {Thread.currentThread();int j = 0;while(j++ < 10){Log.e("aaaaaaaaaaaaa", "j----"+j);try {Thread.sleep(250);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}});        thread2.start();        }                if(msg.arg1 == 10){        Log.e("bbbbbbbbbbbbbb", "bbbbbbbbbb");//        thread2.stop();        }                super.handleMessage(msg);        }        };    }}