Android Programming: The Big Nerd Ranch Guide, 2nd Edition

Playing Sounds

One last step: playing the sounds back. Add the play(Sound) method to BeatBox.

Listing 19.5  Playing sounds back (BeatBox.java)

    mSoundPool = new SoundPool(MAX_SOUNDS, AudioManager.STREAM_MUSIC, 0);
    loadSounds();
}

public void play(Sound sound) {
    Integer soundId = sound.getSoundId();
    if (soundId == null) {
        return;
    }
    mSoundPool.play(soundId, 1.0f, 1.0f, 1, 0, 1.0f);
}

public List<Sound> getSounds() {
    return mSounds;
}

Before playing your soundId, you check to make sure it is not null. This might happen if the Sound failed to load.

Once you are sure you have a non-null value, play the sound by calling SoundPool.play(int, float, float, int, int, float). Those parameters are, respectively: the sound ID, volume ...