Android - 如何在 TimerTask 中将 SoundPool 静音而不停止它

Question

我正在尝试创建节拍器的声音，但是无法将其静音。我希望能够在不停止 TimerTask 的情况下将其静音，因为我希望在取消静音后速率保持一致。这是我的代码：

public class Metronome {
    private boolean mute;
    private boolean playing = false;
    private Timer mainTimer;
    private SoundPool mSoundPool;
    int mSoundID;

    public Metronome(Context context) {
        mSoundPool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
        mSoundID = mSoundPool.load(context, R.raw.metronome, 1);
    }

    public void play(float pace, boolean mute) {
        mainTimer = new Timer();
        MyTimerTask mainTimerTask = new MyTimerTask();
        mainTimer.schedule(mainTimerTask, 0, Math.round(pace * 1000));
        this.mute = mute;
        playing = true;
    }

    public void stop() {
        mainTimer.cancel();
        mainTimer.purge();
        playing = false;
    }

    public boolean isPlaying() {
        return playing;
    }

    public void setMute(boolean mute) {
        this.mute = mute;
        if (mute) {
            mSoundPool.setVolume(mSoundID, 0, 0);
        } else {
            mSoundPool.setVolume(mSoundID, 1, 1);
        }
    }

    private void playSound() {
        if (!mute) {
            mSoundPool.play(mSoundID, 1, 1, 1, 0, 1);
        }
    }

    class MyTimerTask extends TimerTask {

        @Override
        public void run() {
            playSound();
        }
    }
}

但是，调用setMute(true) 不起作用。有谁知道如何使我的 SoundPool 静音？

Answer 1

想通了。当我使用静态方法和变量时它可以工作。

public class Metronome {
    public static boolean mute = false;
    public static boolean playing = false;
    private static Timer mainTimer;
    private static SoundPool soundPool;
    private static int soundID;

    public static void loadSound(Context context) {
        soundPool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
        soundID = soundPool.load(context, R.raw.metronome, 1);
    }

    public static void play(float pace, boolean isMuted) {
        mainTimer = new Timer();
        MyTimerTask mainTimerTask = new MyTimerTask();
        mainTimer.schedule(mainTimerTask, 0, Math.round(pace * 1000));
        mute = isMuted;
        playing = true;
    }

    public static void stop() {
        mainTimer.cancel();
        mainTimer.purge();
        playing = false;
    }

    static class MyTimerTask extends TimerTask {
        @Override
        public void run() {
            playSound();
        }

        private void playSound() {
            if (!mute) {
                soundPool.play(soundID, 1, 1, 1, 0, 1);
            }
        }
    }
}