我跳转后如何将线程停止？

首先我是运行几秒后跳转到另一个activity   可是跳过去后线程还在执行，请问removeCallbacks方法如何停止线程在执行？代码添加到哪里？  
代码如下：
package com.haven.skilltest.demo;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.DisplayMetrics;
import android.util.Log;import android.view.Gravity;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;import android.widget.ImageView;
import android.widget.LinearLayout;public class Main extends Activity {
private Animation anm;
private int marginsTop;
public List<ImageView> images;
public LinearLayout ll;
    @Override
    public void onCreate(Bundle savedInstanceState) {
       
        super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); requestWindowFeature(Window.FEATURE_NO_TITLE); DisplayMetrics dm = this.getResources().getDisplayMetrics(); int height = dm.heightPixels;
marginsTop = height - 100;
anm = AnimationUtils.loadAnimation(this, R.anim.myanim);
ll = new LinearLayout(this);
ll.setBackgroundResource(R.drawable.background); images = new ArrayList<ImageView>();
initImage(ll);
playAnimation();
setContentView(ll);
//finish();
    }
    private void playAnimation(){    
     new Thread(){
     @Override
     public void run()
     {
        
         
     try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
int runcount=0;
     while(true)
     {
     if(runcount<2)
     {
     for(int i=0;i<=6;i++)
     {
     handler.sendEmptyMessage(i);
     try {
     Thread.sleep(400);
     } catch (InterruptedException e) {
     e.printStackTrace();
     }
     }
     runcount++;
     }else
     {
     handler.sendEmptyMessage(99);
         //handler.removeCallbacks(null);
       //finish();
     runcount=0;
     }
          }     }     }.start();
     //finish();
     }
         Handler handler=new Handler(){     @Override
     public void handleMessage(Message msg) {  
     switch(msg.what)
     {
     case 0:
     images.get(0).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.l));
     images.get(0).startAnimation(anm);
    
     break;
     case 1:
     images.get(1).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.o));
     images.get(1).startAnimation(anm);
     break;
     case 2:
     images.get(2).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.a));
     images.get(2).startAnimation(anm);
     break;
     case 3:
     images.get(3).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.d));
     images.get(3).startAnimation(anm);
     break;
     case 4:
     images.get(4).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.i));
     images.get(4).startAnimation(anm);
     break;
     case 5:
     images.get(5).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.n));
     images.get(5).setAnimation(anm);
     break;
     case 6:
     images.get(6).setImageDrawable(Main.this.getResources().getDrawable(R.drawable.g));
     images.get(6).setAnimation(anm);
    
                         
     break;
     case 99:
     clearImage();
      Intent ii=new Intent();
                         ii.setClass(Main.this, index.class);
                         startActivity(ii);
                         finish();
                         //return;
     //break;
                        
    
     }
     //finish();
     }
    
     };
    
    private void clearImage()
    {
     for(ImageView image:images)
     {
     image.setImageDrawable(null);
     image.destroyDrawingCache();
     }
    }
    private void initImage(LinearLayout layout) {
    
     layout.setGravity(Gravity.CENTER_HORIZONTAL);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(40, 40);
param.setMargins(30, marginsTop, 0, 0);

LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams(40, 40);
param2.setMargins(-5, marginsTop, 0, 0); ImageView l = new ImageView(this);
l.setLayoutParams(param);
layout.addView(l);
images.add(l); ImageView o = new ImageView(this);
o.setLayoutParams(param2);
layout.addView(o);
images.add(o);


ImageView a = new ImageView(this);
a.setLayoutParams(param2);
layout.addView(a);
images.add(a);

ImageView d = new ImageView(this);
d.setLayoutParams(param2);
layout.addView(d);
images.add(d);

ImageView i = new ImageView(this);
i.setLayoutParams(param2);
layout.addView(i);
images.add(i);

ImageView n = new ImageView(this);
n.setLayoutParams(param2);
layout.addView(n);
images.add(n);

ImageView g = new ImageView(this);
g.setLayoutParams(param2);
layout.addView(g);
images.add(g);
//finish();
}
}