之前看到用AIDl的方法，觉得还不错。但偶然看到一种，感觉简单，但原理差不多。贴上代码大家体会下吧！
public class AudioService extends Service implements MediaPlayer.OnCompletionListener{
MediaPlayer player;
private final IBinder binder = new AudioBinder();
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return binder;
}
/**
* 当Audio播放完的时候触发该动作
*/
@Override
public void onCompletion(MediaPlayer player) {
// TODO Auto-generated method stub
stopSelf();//结束了，则结束Service
}
//在这里我们需要实例化MediaPlayer对象
public void onCreate(){
super.onCreate();
//我们从raw文件夹中获取一个应用自带的mp3文件
player = MediaPlayer.create(this, R.raw.tt);
player.setOnCompletionListener(this);
}
/**
* 该方法在SDK2.0才开始有的，替代原来的onStart方法
*/
public int onStartCommand(Intent intent, int flags, int startId){
if(!player.isPlaying()){
player.start();
}
return START_STICKY;
}
public void onDestroy(){
//super.onDestroy();
if(player.isPlaying()){
player.stop();
}
player.release();
}
//为了和Activity交互，我们需要定义一个Binder对象
class AudioBinder extends Binder{
//返回Service对象
AudioService getService(){
return AudioService.this;
}
}
//后退播放进度
public void haveFun(){
if(player.isPlaying() && player.getCurrentPosition()>2500){
player.seekTo(player.getCurrentPosition()-2500);
}
}
}
下面是activity:
public class BackgroundAudioDemo extends Activity {
private AudioService audioService;
//使用ServiceConnection来监听Service状态的变化
private ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
audioService = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
//这里我们实例化audioService,通过binder来实现
audioService = ((AudioService.AudioBinder)binder).getService();
}
};
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.back_audio);
}
public void onClick(View v){
int id = v.getId();
Intent intent = new Intent();
intent.setClass(this, AudioService.class);
if(id == R.id.btn_start){
//启动Service，然后绑定该Service，这样我们可以在同时销毁该Activity，看看歌曲是否还在播放
//startService(intent);
bindService(intent, conn, Context.BIND_AUTO_CREATE);
// finish();
}else if(id == R.id.btn_end){
//结束Service
unbindService(conn);
stopService(intent);
finish();
}else if(id == R.id.btn_fun){
audioService.haveFun();
}
}
}
