public class SplashState extends State {

	private Texture tex;
	private Sprite logo;
	private TweenManager tm;

	public SplashState(GSM gsm) {
		super(gsm);
		Tween.registerAccessor(Sprite.class, new SpriteAccessor());
		tm = new TweenManager();
		tex = TerrereCo.res.getTexture("logo");
		logo = new Sprite(tex);
		Tween.set(logo, SpriteAccessor.ALPHA).target(0).start(tm);
		Tween.to(logo, SpriteAccessor.ALPHA, 2).target(2).repeatYoyo(1, 2).start(tm);
	}

	@Override
	protected void render() {
		sb.setProjectionMatrix(cam.combined);
		sb.begin();
		logo.draw(sb);
		sb.end();
	}

	@Override
	protected void update() {
		tm.update(Gdx.graphics.getDeltaTime());
		handleInput();
		cam.update();
	}

	@Override
	protected void handleInput() {

	}


}

==================================================================================

public class SpriteAccessor implements TweenAccessor<Sprite> {

	public static final int ALPHA = 0;

	@Override
	public int getValues(Sprite target, int tweenType, float[] returnValues) {
		switch(tweenType) {
		case ALPHA:
			returnValues[0] = target.getColor().a;
			return 1;
		default:
			assert false;
			return -1;
		}
	}

	@Override
	public void setValues(Sprite target, int tweenType, float[] newValues) {
		switch(tweenType) {
		case ALPHA:
			target.setColor(target.getColor().r, target.getColor().g, target.getColor().b, newValues[0]);
			break;
			default:
				assert false;
		}

	}

}