java - 我的 soundpool 项目无法正常播放？

Question

我一直在尝试实现这个 soundpool 类(在教程的一些帮助下)，但是当我尝试在虚拟设备上运行它时，声音不会播放... main_activity XML 文件加载正常，但是预计加载时会播放声音。

这是源代码。

public class MainActivity extends Activity {

private SoundPool soundpool;
private boolean soundPoolLoaded = false;

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

    // Create a new SoundPool instance.
    // 2 = number of sounds that can be simultaneously played
    // AudioManager.STREAM_MUSIC = The type of sound stream. STREAM_MUSIC is the most common one
    // 0 = sound quality, default is 0.
    // setOnLoadCompleteListener loads the file 
    soundpool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
    soundpool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
        @Override
        public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
            soundPoolLoaded = true;
        }
    });

    playSound("car_phonic");
}


// This method will load a sound resource from the res/raw folder by the input name given as a string (soundName).
// If the sound resource is found by name, it will attempt to play the sound
// soundPoolLoaded value becomes true when the file is fully loaded
public void playSound(String soundName) {
    if(soundPoolLoaded == true)
    {
        // Get the current context resources and find the correct sound resource for playing the sound
        Resources res = this.getResources();
        int soundId = 0;
        soundId = res.getIdentifier(soundName, "raw", this.getPackageName());

        if(soundId != 0){   
        soundpool.play(soundId, 1, 1, 0, 0, 1);
        }


        SystemClock.sleep(500);
        playSound(soundName);

    }
    }
}

如有任何帮助，我们将不胜感激!

Answer 1

• play() 采用 SoundPools load() 返回的 soundID，而不是通用的 Android 资源 ID
• 调用onLoadComplete，然后声音文件完成加载，注意sampleId参数

所以，它的基本形式是:

soundpool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
    @Override
    public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
        soundpool.play(sampleId, 1, 1, 0, 0, 1);
    }
});

soundpool.load(this, R.raw.car_phonic, 0);

请注意，SoundPool 在后台加载数据，因此样本无法立即可用。