import 'package:flutter/material.dart';

import 'package:flutter_app/pages/SplashScreen.dart';

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

class MyApp extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return MaterialApp(

      title: 'Flutter Demo',

      theme: ThemeData(

        primarySwatch: Colors.green,  //定义主题风格    primarySwatch

      ),

      home:  SplashScreen(),

    );

  }

}

import 'package:flutter/material.dart';

import '../MyHomePage.dart';

class SplashScreen extends StatefulWidget {

  _SplashScreenState createState() => _SplashScreenState();

}

class _SplashScreenState extends State<SplashScreen> with SingleTickerProviderStateMixin {

  AnimationController _controller;

  Animation _animation;

  void initState() {

    super.initState();

    _controller = AnimationController(vsync:this,duration:Duration(milliseconds:3000));

    _animation = Tween(begin: 0.0,end:1.0).animate(_controller);

    /*动画事件监听器，

    它可以监听到动画的执行状态，

    我们这里只监听动画是否结束，

    如果结束则执行页面跳转动作。 */

    _animation.addStatusListener((status){

      if(status == AnimationStatus.completed){

        Navigator.of(context).pushAndRemoveUntil(

            MaterialPageRoute(builder: (context)=>MyHomePage()),

                (route)=> route==null);

      }

    });

    //播放动画

    _controller.forward();

  }

  @override

  void dispose() {

    _controller.dispose();

    super.dispose();

  }

  @override

  Widget build(BuildContext context) {

    return FadeTransition( //透明度动画组件

      opacity: _animation,  //执行动画

      child: Image.network(  //网络图片

          'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1546851657199&di=fdd278c2029f7826790191d59279dbbe&imgtype=0&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F0112cb554438090000019ae93094f1.jpg%401280w_1l_2o_100sh.jpg',

          scale: 2.0,  //进行缩放

          fit:BoxFit.cover  // 充满父容器

      ),

    );

  }

}