public void setOnRippleAnimationEndListener(KeyboardButtonClickedListener keyboardButtonClickedListener) {
        mKeyboardButtonClickedListener = keyboardButtonClickedListener;
    }
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