英文:
How to Gradually Accelerate Sound Playing Speed in Android?
问题
我想播放一个声音，让播放速度逐渐加快，即第一次以1倍速播放，然后以1.5倍速播放，然后以2倍速播放，然后以3.5倍速，4倍速等等。我尝试编写了一些代码，例如：
MediaPlayer mp;
float mpDrumFreq = 0f;
float frequency = 1f;
mp = MediaPlayer.create(MainActivity.this, R.raw.tiktok);
mp.setLooping(true);
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mpDrumFreq = Math.min(10f, (mpDrumFreq + frequency));
mp.setPlaybackParams(mp.getPlaybackParams().setSpeed(mpDrumFreq));
}
}
});
TextView play = findViewById(R.id.play);
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mp.start();
}
});
在这里，MediaPlayer mp 播放声音。我试图在 setOnCompletionListener 中使用这行代码来增加速度：mp.setPlaybackParams(mp.getPlaybackParams().setSpeed(newSpeed));
我尝试了一些其他变化，但都没有成功。我不知道为什么。有人知道如何做到这一点吗？
在这种情况下，我尝试了 MediaPlayer，但可以随意建议任何其他内容，例如 SoundPool 或其他库。
有人能帮帮我吗？
英文:
I would like to play a sound that will gradually accelerate playing speed, that is, 1st time it plays 1x speed, then 1.5x speed, then 2.0x speed, then 3.5x, 4x, ... something like that. I tried to write some codes, such as this:
MediaPlayer mp;
float mpDrumFreq = 0f;
float frequency = 1f;
mp = MediaPlayer.create(MainActivity.this, R.raw.tiktok);
mp.setLooping(true);
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mpDrumFreq = Math.min(10f, (mpDrumFreq+frequency) );
mp.setPlaybackParams(mp.getPlaybackParams().setSpeed(mpDrumFreq));
}
}
});
TextView play = findViewById(R.id.play);
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mp.start();
}
});
Here, the MediaPlayer mp plays sound. I am trying to increasing speed inside setOnCompletionListener with this line mp.setPlaybackParams(mp.getPlaybackParams().setSpeed(newSpeed));
And I some other variations of it. But it did not work. I don't know why. Does anyone know how to do this?
In this case I tried with MediaPlayer but feel free to suggest anything such as SoundPool or some other library.
Can anyone help me?
答案1
得分: 1
你可以尝试使用 SoundPool：
private static SoundPool sound;
private static SparseIntArray soundPoolMap = new SparseIntArray();
...
// 1 - 使用一个线程
sound = new SoundPool(1, AudioManager.STREAM_MUSIC, 100);
soundPoolMap.put(0, sound.load(application, R.raw.sound, 0));
...
// 最后一个参数 - 声音速率
sound.play(soundPoolMap.get(0), 1.0f, 1.0f, 0, 0, 1f);
但正如 Howard Liu 在这里所写，SoundPool 没有 setOnCompletionListener() 方法，并建议使用自定义类。
英文:
You can try with a SoundPool:
private static SoundPool sound;
private static SparseIntArray soundPoolMap = new SparseIntArray();
...
// 1 - use one thread
sound = new SoundPool(1, AudioManager.STREAM_MUSIC, 100);
soundPoolMap.put(0, sound.load(application, R.raw.sound, 0));
...
// last parameter - rate of sound
sound.play(soundPoolMap.get(0), 1.0f, 1.0f, 0, 0, 1f);
But as it is written Howard Liu here SoundPool doesn't have setOnCompletionListener() and suggests using custom class.
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