Android:声音池和服务

Question

我已经创建了实现媒体播放器类的服务来播放背景音乐。但现在我想转换成声音池以便可以播放多种声音。 可以帮忙提供一些源代码的链接吗？

提前致谢。

Answer 1

刚刚我已经实现了带有背景声音的服务，我已经检查了来自http://android-er.blogspot.com/2010/11/play-audio-resources-using-soundpool.html的代码和 http://developer.android.com/guide/topics/fundamentals/bound-services.html

public class LocalService extends Service {
    // Binder given to clients
    private final IBinder mBinder = new LocalBinder();
    // Random number generator
    private final Random mGenerator = new Random();

    private SoundPool soundPool;
    private HashMap<Integer, Integer> soundsMap;
    int SOUND1=1;
    int SOUND2=2;
    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();

        soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
        soundsMap = new HashMap<Integer, Integer>();
        soundsMap.put(SOUND1, soundPool.load(this, R.raw.baby_laugh, 1));
        soundsMap.put(SOUND2, soundPool.load(this, R.raw.touchdown, 1));
    }
    public void playSound(int sound, float fSpeed) {
        AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
        float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
        float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume = streamVolumeCurrent / streamVolumeMax;


        soundPool.play(soundsMap.get(sound), volume, volume, 1, 0, fSpeed);
       }


    /**
     * Class used for the client Binder.  Because we know this service always
     * runs in the same process as its clients, we don't need to deal with IPC.
     */
    public class LocalBinder extends Binder {
        LocalService getService() {
            // Return this instance of LocalService so clients can call public methods
            return LocalService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    /** method for clients */
    public int getRandomNumber() {
      return mGenerator.nextInt(100);
    }

    public void soundPlay(int index){

         playSound(index, 1.0f);
         Log.d("SOUND1","hi1");

    }   }

您使用 Activity 调用

public class Test extends Activity implements OnClickListener {
    LocalService mService;
    boolean mBound = false;

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

        Button btn=(Button)findViewById(R.id.a_button);
        btn.setOnClickListener(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
        // Bind to LocalService
        Intent intent = new Intent(this, LocalService.class);
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        // Unbind from the service

      if (mBound) {
            unbindService(mConnection);
            mBound = false;
        }
    }

    /** Called when a button is clicked (the button in the layout file attaches to
      * this method with the android:onClick attribute) */
    public void onButtonClick(View v) {
        if (mBound) {
            // Call a method from the LocalService.
            // However, if this call were something that might hang, then this request should
            // occur in a separate thread to avoid slowing down the activity performance.
            int num = mService.getRandomNumber();
            Toast.makeText(this, "number: " + num, Toast.LENGTH_SHORT).show();
        }
    }

    /** Defines callbacks for service binding, passed to bindService() */
    private ServiceConnection mConnection = new ServiceConnection() {


        public void onServiceConnected(ComponentName className,
                IBinder service) {
            // We've bound to LocalService, cast the IBinder and get LocalService instance
            LocalBinder binder = (LocalBinder) service;
            mService = binder.getService();
            mBound = true;
        }


        public void onServiceDisconnected(ComponentName arg0) {
            mBound = false;
        }
    };

    public void onClick(View arg0) {
        if (mBound) {
            // Call a method from the LocalService.
            // However, if this call were something that might hang, then this request should
            // occur in a separate thread to avoid slowing down the activity performance.
               mService.soundPlay(1);
            int num = mService.getRandomNumber();
            Toast.makeText(this, "number: " + num, Toast.LENGTH_SHORT).show();
        }

    }
}

感谢所有帮助我的人。特别是写博客的人。