java - 如何使用 Android 动画播放“滴答滴答”声音（可能使用“Android MediaPlayer / SoundPool”）？

Question

我有一个自定义视图 ( PieView)，它有一个旋转动画。现在我想和tick tick tick tick...旋转速度同步播放声音（即旋转速度快时，滴答声要快，旋转慢时，滴答声要慢）。为此，首先我创建了一个名为的 mp3 文件magicbox_tick.mp3，该文件只有一 (1) 个刻度。接下来我尝试用 播放声音Animation.setUpdateListener()。

首先，我尝试播放音乐，MediaPlayer但大约 10 或 15 个滴答声后，它停止了。所以现在我正在尝试SoundPool播放音乐。

相关代码段如下所示：

public PieView extends View {
  // ... constructors, other methods etc
  private SoundPool soundPool;
  private int soundId;

  void init(){  // called inside those constructors
        SoundPool soundPool = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
        soundId = soundPool.load(getContext(), R.raw.magicbox_tick, 1);
  }

  public void rotateTo(){
    animate()..setInterpolator(new DecelerateInterpolator())
                .setDuration(mDuration)
                .setListener(someListener)
                .rotation(targetAngle)
                .setUpdateListener(animation -> {
                    myPlaySound();  // <----------------------- This is the sound playing code
                })
                .start();
  }

  void myPlaySound(){
          soundPool.play(soundId, 1, 1, 0, 0, 1); // this doesnot play the `tick` sound
          // previously I used MediaPlayer like this:
         /*
            MediaPlayer mp = new MediaPlayer.create(getContext(), R.raw.magicbox_tick);
            mp.play(); 
               // these 2 line, after some 10 ticks, stopped working. 
          */
  }

}

我从来没有做过这样的事情，我不知道如何解决这个问题。谁能帮我？请注意，只要可行，我对所有答案持开放态度。您不必使用SoundPool. 所以假设如果你可以让它与 android 一起工作MediaPlayer，我可以接受。

标签： javaandroidandroid-animationandroid-mediaplayersoundpool

Answer 1

特别感谢Mike M先生的宝贵意见。我能够使用MediaPlayer. MediaPlayer.release() 方法应该被调用。为了使声音与角运动同步，我保留了一个 if 块来检查旋转dTheta是否大于tolerance角度。因此，如果有人需要，完整的代码如下所示：

public PieView extends View{
     private float omega0; // holds the previous rotation
    /**
     * @brief: plays a music using mediaPlayer
     * @input:
     * @output: void, plays a music
     * */
    private void myPlayTick() {
        float omega1 = Math.abs(getRotation());
        float dOmeda = 0;
        if(omega1>omega0){
            dOmeda = omega1 - omega0;
        }else{
            dOmeda = omega0-omega1;
        }
        if(dOmeda > threshold){
            omega0 = omega1; // update previous rotation
            final MediaPlayer mp = MediaPlayer.create(getContext(), R.raw.magicbox_tick);
            mp.start();
            mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    releaseMediaPlayer(mp);
                }
            });
        }
    }

    /**
     * @brief: releases mediaPlayer resource so that other mediaPlayers can use sound hardware resources
     * @input: MediaPlayer object
     * @output: void
     * */
    private void releaseMediaPlayer(MediaPlayer mediaPlayer) {
        try {
            if (mediaPlayer != null) {
                if (mediaPlayer.isPlaying())
                    mediaPlayer.stop();
                mediaPlayer.release();
                mediaPlayer = null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


 public void rotateTo(){
    animate()..setInterpolator(new DecelerateInterpolator())
                .setDuration(mDuration)
                .setListener(someListener)
                .rotation(targetAngle)
                .setUpdateListener(animation -> {
                   myPlayTick();                  
                })
                .start();
  }
     // ... rest of the code, such as constructors, etc
}