class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with TickerProviderStateMixin{
  AnimationController _controller;
  Animation _animation;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: Duration(seconds: 6),
    );
    _animation = Tween(begin: 0.0, end: 1,).animate(_controller);
    _animation.addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        Navigator.of(context).pushAndRemoveUntil(
            MaterialPageRoute(builder: (context) {
              return IndexPage();
            }), (route) => route == null);
      }
    });
    _controller.forward();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        width: window.physicalSize.width,
        height: window.physicalSize.height,
        child: Image.asset('images/a.jpg',fit: BoxFit.cover,),
      ),
    );
  }
}
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