利用服务播放音乐的实例，大部分采用SDK上的方式,

MainActivity:

package com.example.androidtest;import com.example.androidtest.myService.LocalBinder;import android.os.Bundle;import android.os.IBinder;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {    protected myService mService;//用于保存sevice所返回的myService对象,以调用Service中所提供的方法    protected boolean mBound;//用于判断绑定情况    private ServiceConnection mConnection = new ServiceConnection() {//作为bindService参数，在绑定后将调用 onServiceConnected，并接受到返回的IBinder对象，该对象可用于获取service所要提供的数据，本例中由于在服务中的LocalBinder添加了getService方法，故可用于获取myService对象        @Override        public void onServiceConnected(ComponentName className, IBinder service) {            LocalBinder binder = (LocalBinder) service;            mService = binder.getService();            mBound = true;        }        @Override        public void onServiceDisconnected(ComponentName arg0) {//在unbindService后调用，用作清理资源            mBound = false;            mService.stopMusic();        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bindService(new Intent(this, myService.class), mConnection,                Context.BIND_AUTO_CREATE);//绑定服务        Button startButton = (Button) findViewById(R.id.button1);        Button pauseButton = (Button) findViewById(R.id.button2);        Button stopButton = (Button) findViewById(R.id.button3);        startButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                mService.playMusic();                // TODO Auto-generated method stub            }        });        pauseButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                mService.pauseMusic();                // TODO Auto-generated method stub            }        });        stopButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                mService.stopMusic();            }        });    }    @Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        if (mBound == true) {            unbindService(mConnection);//解除绑定        }    }}

myService：

package com.example.androidtest;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Binder;import android.os.IBinder;import android.util.Log;public class myService extends Service {    private  LocalBinder localBinder=new LocalBinder();;    private  MediaPlayer mediaPlayer;//创建一个以raw/music为播放文件的MediaPlayer对象，可用于播放音乐    @Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        mediaPlayer=MediaPlayer.create(myService.this,R.raw.music);        return  localBinder;    }    //创建内部类作为onBind返回值，用于给客户端获取服务端的载体    public class LocalBinder extends Binder {        myService getService() {//直接返回myService对象，个人认为此种方法比较简单，也可在此创建其他需要返回给客户端的方法，用于通信            return myService.this;        }    }    //客户端可调用方法：    public void playMusic() {        mediaPlayer.start();    }    public void pauseMusic() {        mediaPlayer.pause();    }    public void stopMusic(){        mediaPlayer.stop();    }}