animation

import 'package:flutter/material.dart';
import 'dart:ui';

void main()=>runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: HomePage(),
      ),
    );
  }
}


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 Container(
                child: Image.network('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1556505982809&di=325db81d5c48c7e639be3c5e676d92d5&imgtype=0&src=http%3A%2F%2Fimg3.duitang.com%2Fuploads%2Fitem%2F201603%2F16%2F20160316143849_BctCE.jpeg',fit: BoxFit.cover,),
              );
            }), (route) => route == null);
      }
    });
    _controller.forward();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        width: window.physicalSize.width,
        height: window.physicalSize.height,
        child: Image.network('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1556505982809&di=8586759ea0d4364df2e11839c9845f36&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201707%2F06%2F20170706170503_mUTKu.jpeg',fit: BoxFit.cover,),
      ),
    );
  }
}