if (fadeInTimeline == null) {
fadeInTimeline = new Timeline(this);
fadeInTimeline.addPropertyToInterpolate("background",
ColorUtil.setAlpha(base, 0), ColorUtil.setAlpha(base, 125));
fadeInTimeline.setDuration(2000);
fadeInTimeline.setEase(new Spline(0.7f));
}
fadeInTimeline.replay();
}