<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  > 
  <TextView  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="Welcome to Andy's blog!" 
    android:textSize="16sp"/>   
  <TextView  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="音乐播放服务"/> 
  <Button 
    android:id="@+id/startMusic"  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="开启音乐播放服务"/> 
  <Button 
    android:id="@+id/stopMusic"  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="停止音乐播放服务"/> 
  <Button 
   android:id="@+id/bindMusic"  
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="绑定音乐播放服务"/> 
  <Button 
   android:id="@+id/unbindMusic"  
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="解除 ——绑定音乐播放服务"/> 
</LinearLayout> 

package com.andyidea.service; 
import android.app.Service; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.IBinder; 
import android.util.Log; 
import android.widget.Toast; 
public class MusicService extends Service { 
  //为日志工具设置标签 
  private static String TAG = "MusicService"; 
  //定义音乐播放器变量 
  private MediaPlayer mPlayer; 
   
  //该服务不存在需要被创建时被调用，不管startService()还是bindService()都会启动时调用该方法 
  @Override 
  public void onCreate() { 
    Toast.makeText(this, "MusicSevice onCreate()" 
        , Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicSerice onCreate()"); 
     
    mPlayer = MediaPlayer.create(getApplicationContext(), R.raw.music); 
    //设置可以重复播放 
    mPlayer.setLooping(true); 
    super.onCreate(); 
  } 
   
  @Override 
  public void onStart(Intent intent, int startId) { 
    Toast.makeText(this, "MusicSevice onStart()" 
        , Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicSerice onStart()"); 
     
    mPlayer.start(); 
     
    super.onStart(intent, startId); 
  } 
  @Override 
  public void onDestroy() { 
    Toast.makeText(this, "MusicSevice onDestroy()" 
        , Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicSerice onDestroy()"); 
     
    mPlayer.stop(); 
     
    super.onDestroy(); 
  } 
  //其他对象通过bindService 方法通知该Service时该方法被调用 
  @Override 
  public IBinder onBind(Intent intent) { 
    Toast.makeText(this, "MusicSevice onBind()" 
        , Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicSerice onBind()"); 
     
    mPlayer.start(); 
     
    return null; 
  } 
  //其它对象通过unbindService方法通知该Service时该方法被调用 
  @Override 
  public boolean onUnbind(Intent intent) { 
    Toast.makeText(this, "MusicSevice onUnbind()" 
        , Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicSerice onUnbind()"); 
     
    mPlayer.stop(); 
     
    return super.onUnbind(intent); 
  } 
   
} 

package com.andyidea.service; 
import android.app.Activity; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.Intent; 
import android.content.ServiceConnection; 
import android.os.Bundle; 
import android.os.IBinder; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 
public class MusicServiceActivity extends Activity { 
   
  //为日志工具设置标签 
  private static String TAG = "MusicService"; 
   
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     
    //输出Toast消息和日志记录 
    Toast.makeText(this, "MusicServiceActivity", 
        Toast.LENGTH_SHORT).show(); 
    Log.e(TAG, "MusicServiceActivity"); 
     
    initlizeViews(); 
  } 
   
  private void initlizeViews(){ 
    Button btnStart = (Button)findViewById(R.id.startMusic); 
    Button btnStop = (Button)findViewById(R.id.stopMusic); 
    Button btnBind = (Button)findViewById(R.id.bindMusic); 
    Button btnUnbind = (Button)findViewById(R.id.unbindMusic); 
     
    //定义点击监听器 
    OnClickListener ocl = new OnClickListener() { 
       
      @Override 
      public void onClick(View v) { 
        //显示指定 intent所指的对象是个  service 
        Intent intent = new Intent(MusicServiceActivity.this,MusicService.class); 
        switch(v.getId()){ 
        case R.id.startMusic: 
          //开始服务 
          startService(intent); 
          break; 
        case R.id.stopMusic: 
          //停止服务 
          stopService(intent); 
          break; 
        case R.id.bindMusic: 
          //绑定服务 
          bindService(intent, conn, Context.BIND_AUTO_CREATE); 
          break; 
        case R.id.unbindMusic: 
          //解绑服务 
          unbindService(conn); 
          break; 
        } 
      } 
    }; 
     
     //绑定点击监听 
    btnStart.setOnClickListener(ocl); 
    btnStop.setOnClickListener(ocl); 
    btnBind.setOnClickListener(ocl); 
    btnUnbind.setOnClickListener(ocl); 
  } 
   
  //定义服务链接对象 
  final ServiceConnection conn = new ServiceConnection() { 
     
    @Override 
    public void onServiceDisconnected(ComponentName name) { 
      Toast.makeText(MusicServiceActivity.this, "MusicServiceActivity onSeviceDisconnected" 
          , Toast.LENGTH_SHORT).show(); 
      Log.e(TAG, "MusicServiceActivity onSeviceDisconnected"); 
    } 
     
    @Override 
    public void onServiceConnected(ComponentName name, IBinder service) { 
      Toast.makeText(MusicServiceActivity.this, "MusicServiceActivity onServiceConnected" 
          ,Toast.LENGTH_SHORT).show(); 
      Log.e(TAG, "MusicServiceActivity onServiceConnected"); 
    } 
  }; 
}