@Override
    public void onRippleAnimationEnd() {
        if (mKeyboardButtonClickedListener != null) {
            mKeyboardButtonClickedListener.onRippleAnimationEnd();
        }
    }
Set by {@link com.github.omadahealth.lollipin.lib.views.KeyboardView} to returns events to
{@link com.github.omadahealth.lollipin.lib.managers.AppLockActivity}
lib/src/main/java/com/github/omadahealth/lollipin/lib/views/KeyboardButtonView.java