public static final int SOUND_EXPLOSION = 1;

private SoundPool soundPool;
private HashMap<Integer, Integer> soundPoolMap;

private void initSounds() {
soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
soundPoolMap = new HashMap<Integer, Integer>();
soundPoolMap.put(SOUND_EXPLOSION, soundPool.load(getContext(), R.raw.explosion, 1));
}

public void playSound(int sound) {
/* Updated: The next 4 lines calculate the current volume in a scale of 0.0 to 1.0 */
AudioManager mgr = (AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float volume = streamVolumeCurrent / streamVolumeMax;

/* Play the sound with the correct volume */
soundPool.play(soundPoolMap.get(sound), volume, volume, 1, 0, 1f);
}

public void explode() {
playSound(SOUND_EXPLOSION);
}

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