[android help] my soundpool project won't play properly?

I've been trying to implement this soundpool class (with some help from a tutorial) but when I try to run it on a virtual device, the sound won't play... The main_activity XML file loads fine, but it was expected that on loading, a sound would be played.

here is the source code.

public class MainActivity extends Activity {

private SoundPool soundpool;
private boolean soundPoolLoaded = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Create a new SoundPool instance.
    // 2 = number of sounds that can be simultaneously played
    // AudioManager.STREAM_MUSIC = The type of sound stream. STREAM_MUSIC is the most common one
    // 0 = sound quality, default is 0.
    // setOnLoadCompleteListener loads the file 
    soundpool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
    soundpool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
        @Override
        public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
            soundPoolLoaded = true;
        }
    });

    playSound("car_phonic");
}


// This method will load a sound resource from the res/raw folder by the input name given as a string (soundName).
// If the sound resource is found by name, it will attempt to play the sound
// soundPoolLoaded value becomes true when the file is fully loaded
public void playSound(String soundName) {
    if(soundPoolLoaded == true)
    {
        // Get the current context resources and find the correct sound resource for playing the sound
        Resources res = this.getResources();
        int soundId = 0;
        soundId = res.getIdentifier(soundName, "raw", this.getPackageName());

        if(soundId != 0){   
        soundpool.play(soundId, 1, 1, 0, 0, 1);
        }


        SystemClock.sleep(500);
        playSound(soundName);

    }
    }
}

Any help would be appreciated! Thanks

.

stackoverflow.comm