How to create singleton SoundManager in android?

Create the class soundManager as below shown.....

public class SoundManager {

static private SoundManager _instance;

private static SoundPool mSoundPool; 

private static HashMap<Integer, Integer> mSoundPoolMap; 

private static AudioManager  mAudioManager;

private static Context mContext;

private SoundManager()

{   

}

/*

* Requests the instance of the Sound Manager and creates it if it does not

* exist.Returns the single instance of the SoundManager

*/

static synchronized public SoundManager getInstance() 

{

   if (_instance == null) 

     _instance = new SoundManager();

   return _instance;

}

/*

* Initialises the storage for the sounds theContext The Application context

*/

 

public static  void initSounds(Context theContext) 

{ 

mContext = theContext;

    mSoundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 0);

    mSoundPoolMap = new HashMap<Integer, Integer>(); 

    mAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);    

} 

/**

* Add a new Sound to the SoundPool

* @author Shailesh Shukla

* @param Index - The Sound Index for Retrieval

* @param SoundID - The Android ID for the Sound asset.

*/

public static void addSound(int Index,int SoundID)

{

mSoundPoolMap.put(Index, mSoundPool.load(mContext, SoundID, 1));

}

/**

* Loads the various sound assets

* Currently hardcoded but could easily be changed to be flexible.

*/

public static void loadSounds()

{

mSoundPoolMap.put(1, mSoundPool.load(mContext, R.raw.starwars, 1));

mSoundPoolMap.put(2, mSoundPool.load(mContext, R.raw.terminator, 1));

}

/**

* Plays a Sound

* @author Shailesh Shukla

* @param index - The Index of the Sound to be played

* @param speed - The Speed to play not, not currently used but included for compatibility

*/

public static void playSound(int index,float speed) 

{

    float streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); 

    streamVolume = streamVolume / mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

    mSoundPool.play(mSoundPoolMap.get(index), streamVolume, streamVolume, 1, 0, speed); 

}

/**

* Stop a Sound

* @param index - index of the sound to be stopped

* @author Shailesh Shukla

*/

public static void stopSound(int index)

{

mSoundPool.stop(mSoundPoolMap.get(index));

}

public static void cleanup()

{

mSoundPool.release();

mSoundPool = null;

   mSoundPoolMap.clear();

   mAudioManager.unloadSoundEffects();

   _instance = null;

   

}

}

After this is done call the below line of code in onCreate() of activity........

//Create, Initialise and then load the Sound manager
        SoundManager.getInstance();
        SoundManager.initSounds(this);
        SoundManager.loadSounds();

And to play the sound loaded above......you can call
SoundManager.playSound(1, 1);         OR     SoundManager.playSound(2, 1);  

After the job is done call the cleanUp() in each Activity

public void onDestroy()
    {
    super.onDestroy();
    SoundManager.cleanup();
    }