Android开启新线程播放背景音乐

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:tools="http://schemas.android.com/tools" 
 android:id="@+id/linearLayout1" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:orientation="vertical" > 
 
 
  <Button 
   android:id="@+id/button1" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="开始" /> 
 
 
</LinearLayout> 

package com.example.test; 
 
import android.app.Activity; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnCompletionListener; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
 
public class MainActivity extends Activity{ 
 private Thread thread;//声明一个线程对象 
 private static MediaPlayer mp=null;//声明一个MediaPlayer对象 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
   
  Button startButton=(Button)findViewById(R.id.button1);//获取开始按钮 
  startButton.setOnClickListener(new OnClickListener() { 
    
   @Override 
   public void onClick(View v) { 
     ((Button)v).setEnabled(false);//设置按钮不可用 
     //创建一个用于播放背景音乐的线程 
     thread=new Thread(new Runnable(){ 
 
 
     @Override 
     public void run() { 
      playBGSound();//播放背景音乐 
       
     } 
 
 
     }); 
     thread.start();//开启线程 
   } 
  }); 
   
 } 
 
 
 private void playBGSound() { 
  if(mp!=null){ 
   mp.release();//释放资源 
  } 
  mp=MediaPlayer.create(MainActivity.this, R.raw.flower); 
  mp.start(); 
  //为MediaPlayer添加播放完成事件监听 
  mp.setOnCompletionListener(new OnCompletionListener() { 
    
   @Override 
   public void onCompletion(MediaPlayer mp) { 
    try { 
     Thread.sleep(5000);//让线程休眠5秒 
     <span style="white-space:pre">   </span>playBGSound();//重新播放音乐 
    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
     
   } 
  }); 
 } 
 
 
 @Override 
 protected void onDestroy() { 
  if(mp!=null){ 
   mp.stop(); 
   mp.release(); 
   mp=null; 
  } 
  if(thread!=null){ 
   thread=null; 
  } 
  super.onDestroy(); 
 } 
 
 
}