class _LogoAppState extends State with SingleTickerProviderStateMixin {
Animation animation;
AnimationController controller;
AnimationStatus animationStatus;
double animationValue;

@override
void initState(){
super.initState();
controller = AnimationController(vsync: this,duration: const Duration(seconds: 2));
animation = Tween(begin: 0,end: 300).animate(controller)
…addListener(() {
setState((){
animationValue = animation.value;
});
})
…addStatusListener((AnimationStatus status) {
setState((){
animationStatus = status;
});
});
}