在精确的时间播放三个或更多的短音 SoundPool（钢琴和弦）

Question

我有一个问题，我想同时启动声音。

我循环播放 3-5 个短音（钢琴音），前 1 毫秒，第二个 17 毫秒，依此类推，最后一个声音最多 60-90 毫秒。

我正在使用 SoundPool。

有人遇到过这样的问题或使用过可以解决此问题的库（同步启动多个短音）吗？

以下是示例测试示例（我使用 RxJava，但我在使用和不使用 RxJava 的情况下对其进行了测试）：

   Observable.timer(150, TimeUnit.MILLISECONDS, Schedulers.single())
            .repeat()
            .subscribe(aLong -> {
                for (int soundId = 55; i < 60; i++) {
                    soundPool.play(soundId , 1f, 1f, 1, 0, 1);
                }
            });

Answer 1

您似乎需要实现 listener (OnLoadCompleteListener)。 SoundPool 如文档中所述异步加载音频文件，因此我相信这就是您延迟的原因。

找到了 3 个声音的这个工作示例here

public class SoundManager {

    public static int SOUNDPOOLSND_MENU_BTN         = 0;
    public static int SOUNDPOOLSND_WIN              = 1;
    public static int SOUNDPOOLSND_LOOSE            = 2;
    public static int SOUNDPOOLSND_DRAW             = 3;
    public static int SOUNDPOOLSND_TICK1            = 4;
    public static int SOUNDPOOLSND_TICK2            = 5;
    public static int SOUNDPOOLSND_OUT_OF_TIME      = 6;
    public static int SOUNDPOOLSND_HISCORE          = 7;
    public static int SOUNDPOOLSND_CORRECT_LETTER   = 8;

    public static boolean isSoundTurnedOff;

    private static SoundManager mSoundManager;

    private SoundPool mSoundPool; 
    private SparseArray <Integer> mSoundPoolMap; 
    private AudioManager  mAudioManager;

    public static final int maxSounds = 4;

    public static SoundManager getInstance(Context context)
    {
        if (mSoundManager == null){
            mSoundManager = new SoundManager(context);
        }

        return mSoundManager;
   }

    public SoundManager(Context mContext)
    {
        mAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
        mSoundPool = new SoundPool(maxSounds, AudioManager.STREAM_MUSIC, 0);

      mSoundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
          public void onLoadComplete(SoundPool soundPool, int sampleId,int status) {
            loaded = true;
            }
        });

        mSoundPoolMap = new SparseArray<Integer>(); 
        mSoundPoolMap.put(SOUNDPOOLSND_MENU_BTN, mSoundPool.load(mContext, R.raw.menubutton, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_WIN, mSoundPool.load(mContext, R.raw.win, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_LOOSE, mSoundPool.load(mContext, R.raw.lose, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_TICK1, mSoundPool.load(mContext, R.raw.tick_0, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_TICK2, mSoundPool.load(mContext, R.raw.tick_1, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_OUT_OF_TIME, mSoundPool.load(mContext, R.raw.out_of_time, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_HISCORE, mSoundPool.load(mContext, R.raw.personal_highscore, 1));
        mSoundPoolMap.put(SOUNDPOOLSND_CORRECT_LETTER, mSoundPool.load(mContext, R.raw.correct_letter, 1));

        // testing simultaneous playing
        int streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); 
        mSoundPool.play(mSoundPoolMap.get(0), streamVolume, streamVolume, 1, 20, 1f); 
        mSoundPool.play(mSoundPoolMap.get(1), streamVolume, streamVolume, 1, 2, 1f);
        mSoundPool.play(mSoundPoolMap.get(2), streamVolume, streamVolume, 1, 0, 1f);


    } 

    public void playSound(int index) { 
        if (isSoundTurnedOff)
            return;

         int streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); 
         mSoundPool.play(mSoundPoolMap.get(index), streamVolume, streamVolume, 1, 0, 1f); 
    }

    public static void clear()
    {
        if (mSoundManager != null){
            mSoundManager.mSoundPool = null; 
            mSoundManager.mAudioManager = null;
            mSoundManager.mSoundPoolMap = null;
        }
        mSoundManager = null;
    }
}