dev已经给出了最好的答案，这不是一个bug，也不是一个问题，只是配置。 花点时间阅读，一切都会迎刃而解。祝大家有愉快的一天。

https://flutter.dev/docs/development/ui/advanced/splash-screen

最简单的方法是使用flutter_native_splash包

首先，把它添加到你的开发依赖项中:

dev_dependencies:
  flutter_native_splash: ^1.3.1 # make sure to us the latest version

现在，你可以配置你的启动画面你喜欢:

     flutter_native_splash:

      android: true # show for android, you may set it to false
      ios: true # show for IOS, you may set it to false

      image: assets\logo.png # the default image for light and dark themes. Until now, images should be png images
      image_dark: aassets\logo_dark.png # It will override the 'image' in the dark mode

      color: "#ffffff" # the default color for light and dark themes
      color_dark: "#0a0a0a" # will override the 'color' in the dark mode

      android_gravity: fill # make the image fill the screen for android
      ios_content_mode: scaleAspectFill # make the image fill the screen for android

这样做之后，运行:

flutter clean && flutter pub get && flutter pub run flutter_native_splash:create

你会注意到的。“\android\app\src\main\res*”已经改变，并添加了新的启动画面。

你应该试试下面的代码，为我工作

import 'dart:async';
import 'package:attendance/components/appbar.dart';
import 'package:attendance/homepage.dart';
import 'package:flutter/material.dart';

class _SplashScreenState extends State<SplashScreen>
with SingleTickerProviderStateMixin {


void handleTimeout() {
  Navigator.of(context).pushReplacement(new MaterialPageRoute(
    builder: (BuildContext context) => new MyHomePage()));
}

startTimeout() async {
  var duration = const Duration(seconds: 3);
  return new Timer(duration, handleTimeout);
}

@override
void initState() {
  // TODO: implement initState
  super.initState();

  _iconAnimationController = new AnimationController(
      vsync: this, duration: new Duration(milliseconds: 2000));

  _iconAnimation = new CurvedAnimation(
      parent: _iconAnimationController, curve: Curves.easeIn);
  _iconAnimation.addListener(() => this.setState(() {}));

  _iconAnimationController.forward();

  startTimeout();
}

@override
Widget build(BuildContext context) {
  return new Scaffold(
    body: new Scaffold(
      body: new Center(
        child: new Image(
        image: new AssetImage("images/logo.png"),
        width: _iconAnimation.value * 100,
        height: _iconAnimation.value * 100,
      )),
    ),
  );
}
}

为安卓 App -> SRC -> main -> res ->drawble->launch_background.xml 和取消 注释块是这样的

<item>
  <bitmap
      android:gravity="center"
      android:src="@mipmap/launch_image" /></item>

有人在这样编码后会出现错误吗 在android studio中使用与系统同步或使缓存无效并重置。这解决了我的问题 在颤振调试模式需要一些时间采取启动画面。构建后，它将减少像本机android

添加如下所示的页面和路由可能会有所帮助

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutkart/utils/flutkart.dart';
import 'package:flutkart/utils/my_navigator.dart';

class SplashScreen extends StatefulWidget {
  @override
  _SplashScreenState createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen> {
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    Timer(Duration(seconds: 5), () => MyNavigator.goToIntro(context));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.expand,
        children: <Widget>[
          Container(
            decoration: BoxDecoration(color: Colors.redAccent),
          ),
          Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Expanded(
                flex: 2,
                child: Container(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[
                      CircleAvatar(
                        backgroundColor: Colors.white,
                        radius: 50.0,
                        child: Icon(
                          Icons.shopping_cart,
                          color: Colors.greenAccent,
                          size: 50.0,
                        ),
                      ),
                      Padding(
                        padding: EdgeInsets.only(top: 10.0),
                      ),
                      Text(
                        Flutkart.name,
                        style: TextStyle(
                            color: Colors.white,
                            fontWeight: FontWeight.bold,
                            fontSize: 24.0),
                      )
                    ],
                  ),
                ),
              ),
              Expanded(
                flex: 1,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    CircularProgressIndicator(),
                    Padding(
                      padding: EdgeInsets.only(top: 20.0),
                    ),
                    Text(
                      Flutkart.store,
                      softWrap: true,
                      textAlign: TextAlign.center,
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 18.0,
                          color: Colors.white),
                    )
                  ],
                ),
              )
            ],
          )
        ],
      ),
    );
  }
}

如果你想坚持到底，请参见: https://www.youtube.com/watch?v=FNBuo-7zg2Q

当我们必须在应用程序启动之前获得用户位置或其他数据时，我们可以在flutter中使用自定义启动画面，这将使您的应用程序用户友好

代码如下:示例:-

import 'package:flutter/material.dart';
import 'package:bmi/HomePage.dart';
import 'dart:async';

main(){
  runApp(MyApp());
 }

 class MyApp extends StatelessWidget{
 @override
 Widget build(BuildContext context) {
    return SplashScreen();
 }
}

class SplashScreen extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    return SplashScreenState();
  }
}

class SplashScreenState extends State<SplashScreen>{
  @override
  void initState() {
    super.initState();
    when we have to get data we can show splash 
    Like this:- 
    FutureMethodForData.then((value) {
       Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => HomePage(),
          )
        );

    });
    Or we can show splash for fix duration like this:-
    Future.delayed(
      Duration(
        seconds: 4
      ),
      (){
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => HomePage(),
          )
        );
      }
  );
}
@override
Widget build(BuildContext context) {
  return MaterialApp(
    home: Scaffold(
      backgroundColor: Colors.red,
      body: // add image text or whatever you want as splash
    ),
  );
}
}