service

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public class MainActivity extends Activity {MusicInterface mi;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Intent intent = new Intent(this, MusicService.class);        //混合调用        //为了把服务所在进程变成服务进程        startService(intent);        //为了拿到中间人对象        bindService(intent, new MusicServiceConn(), BIND_AUTO_CREATE);    }    class MusicServiceConn implements ServiceConnection{@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {// TODO Auto-generated method stubmi = (MusicInterface) service;}@Overridepublic void onServiceDisconnected(ComponentName name) {// TODO Auto-generated method stub}        }    //开始播放按钮    public void play(View v){    mi.play();    }    //暂停播放按钮    public void pause(View v){    mi.pause();    }}

public class MusicService extends Service{@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn new MusicController();}//必须继承binder，才能作为中间人对象返回class MusicController extends Binder implements MusicInterface{public void play(){MusicService.this.play();}public void pause(){MusicService.this.pause();}}public void play(){System.out.println("播放音乐");}public void pause(){System.out.println("暂停播放");}}

public interface MusicInterface {void play();void pause();}

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