Android使用AIDL方式实现播放音乐案例

 <service
   android:name=".MusicService"
   android:enabled="true"
   android:exported="true">
   <intent-filter>
   <action android:name="com.work.MusicService"></action>
 </intent-filter>

public class MusicService extends Service {

  private MediaPlayer player = null;

  public MusicService() {
  }

  //①实现已经makeproject过的adil接口,重写里边自定义定义的三个方法
  MusicAidlInterface.Stub stub = new MusicAidlInterface.Stub() {
    @Override
    public void paly() throws RemoteException {
      if (player == null) {
        player = MediaPlayer.create(MusicService.this, R.raw.hckz);
      }
      if (player != null && !player.isPlaying()){
        player.start();
      }

    }

    @Override
    public void paus() throws RemoteException {
      if(player!=null&&player.isPlaying()){
        player.pause();
      }

    }

    @Override
    public void stop() throws RemoteException {
      if(player!=null){
        player.stop();
      }
      try {
        player.prepare();//重新准备下次播放
      } catch (IOException e) {
        e.printStackTrace();
      }

    }
  };

  @Override
  public IBinder onBind(Intent intent) {
    return stub;
  }
  //② 重写service销毁时的方法

  @Override
  public void onDestroy() {
    super.onDestroy();
    if(player!=null){
      player.stop();
      player.release();//释放资源，防止失去依托溢出，发生异常
    }
  }

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
  private Button btn_play, btn_pause, btn_stop, btn_stopservice, btn_stopacvitity;
   MusicAidlInterface service = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    intiView();
    connect();

  }

  private void intiView() {
    btn_play = (Button) findViewById(R.id.btn_play);
    btn_pause = (Button) findViewById(R.id.btn_pause);
    btn_stopservice = (Button) findViewById(R.id.btn_stopservice);
    btn_stopacvitity = (Button) findViewById(R.id.btn_exitacvitity);
    btn_stop = (Button) findViewById(R.id.btn_stop);

    btn_play.setOnClickListener(this);
    btn_pause.setOnClickListener(this);
    btn_stop.setOnClickListener(this);
    btn_stopservice.setOnClickListener(this);
    btn_stopacvitity.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {
    try {
      switch (v.getId()) {
        case R.id.btn_play:
          service.paly();
          break;
        case R.id.btn_pause:
          service.paus();
          break;
        case R.id.btn_stop:
          service.stop();
          break;
        case R.id.btn_stopservice:
          if (conn != null) {
            unbindService(conn);
          }
          break;
        case R.id.btn_exitacvitity:
          finish();
          break;
      }
    } catch (RemoteException e) {
      e.printStackTrace();
    }

  }

  //连接service
  ServiceConnection conn = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder iBinder) {
      service = MusicAidlInterface.Stub.asInterface(iBinder);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
      service = null;
    }
  };

  //获取连接BindService的方法
  private void connect() {
    //使用intent的隐式调用方法
    Intent intent = new Intent("com.work.MusicService");
    //设置目标service的包名
    intent.setPackage("com.work.musicservice");
    bindService(intent, conn, BIND_AUTO_CREATE);
  }
  //重写acvitity销毁时候解除绑定的方法

  @Override
  protected void onDestroy() {
    super.onDestroy();
    if (conn != null) {//解除绑定
      unbindService(conn);
    }
  }