public class SoundManager {
    private static SoundManager instance;

    private SoundPool mSoundPool;
    private float cur_engine_volume = 0.7f;
    private int mSoundCount = 3;
    private int mLockOn;
    private int mLockOff;

    protected SoundManager() {
        mSoundPool = new SoundPool(mSoundCount, AudioManager.STREAM_MUSIC, 0);
        mLockOn = mSoundPool.load(MainApplication.getInstance(), R.raw.lock_on, 1);
        mLockOff = mSoundPool.load(MainApplication.getInstance(), R.raw.lock_off, 1);
    }

    public static SoundManager getInstance() {
        if (instance == null) {
            synchronized (SoundManager.class) {
                if (instance == null) {
                    instance = new SoundManager();
                }
            }
        }
        return instance;
    }

    public void lockOn() {
        mSoundPool.play(mLockOn, cur_engine_volume , cur_engine_volume , 1, 0, 1);
    }

    public void lockOff() {
        mSoundPool.play(mLockOff, cur_engine_volume , cur_engine_volume , 1, 0, 1);
    }



}