在播放另一种声音之前,Android SoundPool第二次播放的声音不同

Question

这是我的Activity:

public class MainActivity extends AppCompatActivity {

    private SoundPool soundPool;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setVolumeControlStream(AudioManager.STREAM_MUSIC);

        soundPool = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
        final int sound1 = soundPool.load(this, R.raw.whack, 1);
        final int sound2 = soundPool.load(this, R.raw.miss, 1);

        Button b1 = (Button) findViewById(R.id.b1);
        Button b2 = (Button) findViewById(R.id.b2);

        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                playSound(sound1);
            }
        });
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                playSound(sound2);
            }
        });
    }

    private void playSound(int soundId) {

        AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        float volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
        soundPool.play(soundId, volume, volume, 1, 0, 1);
    }
}

问题是当我点击Button1时,播放了sound1.然后当我一次又一次地点击Button1时,在我点击Button2之前什么也没有播放.当我这样做时,播放声音2.然后,如果我点击Button1,则播放sound1.当我一遍又一遍地点击Button2时会发生同样的情况.那么这里的问题是什么？

Answer 1

据SoundPool.play()文档volume值必须是从0.0到1.0.但是audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)返回更大的值(例如12).因此,您应该设置正确的音量值.下面的工作代码:

public static void playAudio(Context context, SoundPool player, int soundId, float speed){
        AudioManager mgr = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
        float actualVolume=(float) mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
        float maxVolume=(float) mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume= actualVolume/maxVolume;
        player.play(soundId, volume, volume, 1, 0, speed);
    }

Answer 2

Android 7.0版本也有同样的问题，您可以尝试通过更改这部分代码来修复它：

float volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

进入

float volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC) /
               audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

希望这可以解决您面临的问题。:)