服务-音乐播放器

public class MainActivity extends AppCompatActivity {
    private Intent intent;
    private MyServiceConnection serviceConnection;
    private MusicService m_service;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this,MusicService.class);
        serviceConnection = new MyServiceConnection();
    }
    class MyServiceConnection implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //绑定成功。
          MusicService.MyBinder binder = (MusicService.MyBinder) service;
            m_service = binder.getService();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        //启动服务。
        startService(intent);
        //绑定服务。
        bindService(intent,serviceConnection,BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(serviceConnection);
    }

    //播放
    public void play(View view){
        if(m_service!=null){
            m_service.play();
        }
    }
    //暂停
    public void pause(View view){
        if(m_service!=null){
            m_service.pause();
        }
    }
}

 

public class MusicService extends Service {
    private MediaPlayer player;//播放器
    class MyBinder extends Binder {
        public MusicService getService(){
            return MusicService.this;
        }
    }
    @Override
    public IBinder onBind(Intent intent) {
        MyBinder binder = new MyBinder();
        return binder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        //创建播放器。
        player = new MediaPlayer();
        //绑定播放的音乐。
        try {
            String path = Environment.getExternalStorageDirectory().getAbsolutePath() +"/"+Environment.DIRECTORY_MUSIC+ "/a.mp3";
            Log.i("Main",path);
            player.setDataSource(path);
            player.prepare();
        } catch (IOException e) {
            e.printStackTrace();
            Log.i("Main", "出现异常");
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public boolean onUnbind(Intent intent) {
        return super.onUnbind(intent);
    }

    //播放音乐
    public void play() {
        if (!player.isPlaying())
            player.start();;
    }
    //暂停
    public void pause(){
        if(player.isPlaying()){
            player.pause();
        }
    }
}