Android Sound Manager

Constants.java

public class Constants {
	
	public static final int SOUND_SELECT = R.raw.select;
	public static final int SOUND_LOCKED = R.raw.locked;
	public static final int SOUND_OPEN = R.raw.open;
	public static final int SOUND_CLOSE = R.raw.close;
    
	public static final void initSoundManager(Context context, SoundManager soundManager){
	    soundManager.addSound(context, SOUND_SELECT);
	    soundManager.addSound(context, SOUND_LOCKED);
	    soundManager.addSound(context, SOUND_OPEN);
	    soundManager.addSound(context, SOUND_CLOSE);
	
	}
}

MyApplication.java

public class MyApplication extends Application  {
	
	private SoundManager soundManager;

	public SoundManager getSoundManager() {
		if (soundManager == null) {
			soundManager = new SoundManager(); 
			Constants.initSoundManager(this, soundManager);
		}
		return soundManager;
	}
}

SoundManager.java

public class SoundManager {
	
	private SoundPool mSoundPool;
	
	private SparseIntArray mSoundPoolMap = new SparseIntArray();
	
	private Handler mHandler = new Handler();
	private boolean mMuted = false;
	
	private static final int MAX_STREAMS = 2;
	private static final int STOP_DELAY_MILLIS = 3000;

	public SoundManager() {
		mSoundPool = new SoundPool(MAX_STREAMS, AudioManager.STREAM_MUSIC, 0);
	}

	/**
	 * Put the sounds to their correspondig keys in sound pool.
	 */
	public void addSound(Context context, int soundID) {
		mSoundPoolMap.put(soundID, mSoundPool.load(context, soundID, 1));
	}

	/**
	 * Find sound with the key and play it
	 */
	public void playSound(int soundID) {
		if(mMuted){
			return;
		}
		
		boolean hasSound = mSoundPoolMap.indexOfKey(soundID) >= 0;
		if(!hasSound){
			return;
		}
		
		final int soundId = mSoundPool.play(mSoundPoolMap.get(soundID), 1, 1, 1, 0, 1f);
		scheduleSoundStop(soundId);
	}
	
	/**
	 * Schedule the current sound to stop after set milliseconds
	 */
	private void scheduleSoundStop(final int soundId){
		mHandler.postDelayed(new Runnable() {
			public void run() {
				mSoundPool.stop(soundId);
			}
		}, STOP_DELAY_MILLIS);
	}
	
	/**
	 * Initialize the control stream with the activity to music
	 */
	public static void initStreamTypeMedia(Activity activity){
		activity.setVolumeControlStream(AudioManager.STREAM_MUSIC);
	}

	public static int getStreamMusicLevel(Activity activity){
		AudioManager am = (AudioManager) activity.getSystemService(Context.AUDIO_SERVICE);
		return am.getStreamVolume(AudioManager.STREAM_MUSIC);
	}
	
	/**
	 * Is sound muted
	 */
	public void setMuted(boolean muted) {
		this.mMuted = muted;
	}

}