Disable sound when volume keys clicked

Question

In my application I override volume up and volume down keys. The problem is that when user click one of these two keys, sound is played. I want somehow to disable/mute this sound.

Here is fragment of my code:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    switch (keyCode) {

        case KeyEvent.KEYCODE_VOLUME_DOWN: {
            // do something when user click volume down key

            return true;
        }
        case KeyEvent.KEYCODE_VOLUME_UP: {
            // do something when user click volume up key

            return true;
        }

    }
    return super.onKeyDown(keyCode, event);
}

Answer 1

Using onKeyDown or onKeyUp still gives the default sound of changing the volume. Use dispatchKeyEvent instead.

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int keyCode = event.getKeyCode();
    switch (keyCode) {
    case KeyEvent.KEYCODE_VOLUME_UP:
    case KeyEvent.KEYCODE_VOLUME_DOWN:
        return true;
    default:
        return super.dispatchKeyEvent(event);
    }
}