Flutter Splash闪屏页

    void main() {
      runApp(MyApp());
    }
    
    class MyApp extends StatelessWidget {
      // This widget is the root of your application.
      @override
      Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MySplashPage(),
    );
      }
    }
    
    class MySplashPage extends StatefulWidget {
      @override
      _MySplashPageState createState() => _MySplashPageState();
    }
    
    class _MySplashPageState extends State<MySplashPage> {
      @override
      Widget build(BuildContext context) {
    return Container(
      child: Image(
        image: AssetImage('images/splash.png'),
        fit: BoxFit.fill,
      ),
    );
      }
    
      @override
      void initState() {
    // 启动的时候将屏幕设置成全屏模式
    SystemChrome.setEnabledSystemUIOverlays([]);
    super.initState();
    
    // 这里进行1秒后跳转
    Timer(
        Duration(seconds: 1),
        () => Navigator.of(context).pushReplacement(MaterialPageRoute(
            builder: (BuildContext context) => MyHomePage())));
      }
    
      @override
      void dispose() {
    // 关闭的时候将屏幕设置成原来的状态
    SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
    super.dispose();
      }
    }

    <?xml version="1.0" encoding="utf-8"?>
    <!-- Modify this file to customize your launch splash screen -->
    <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
      全屏显示
        <bitmap android:gravity="fill" android:src="@drawable/splash" />
    </item>
    
    </layer-list>

    <?xml version="1.0" encoding="utf-8"?>
    <resources>
    <!-- Theme applied to the Android Window while the process is starting -->
    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <!-- Show a splash screen on the activity. Automatically removed when
             Flutter draws its first frame -->
        <item name="android:windowBackground">@drawable/launch_background</item>
        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
    </style>
    <!-- Theme applied to the Android Window as soon as the process has started.
         This theme determines the color of the Android Window while your
         Flutter UI initializes, as well as behind your Flutter UI while its
         running.
         
         This Theme is only used starting with V2 of Flutter's Android embedding. -->
    <!--    正常的状态下也是显示splash一样的状态-->
    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <item name="android:windowBackground">@drawable/launch_background</item>
    
    </style>
    </resources>

    这是主题中的配置
    <item name="android:windowBackground">@drawable/launch_background</item>
    
    launch_background.xml 
    
    <?xml version="1.0" encoding="utf-8"?><!-- Modify this file to customize your launch splash screen -->
    <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    
    <!--背景图-->
    <item android:drawable="@drawable/splash_background" />
    
    <!--中间显示logo+文案  图片-->
    <item>
        <bitmap
            android:gravity="center"
            android:src="@drawable/logo_text" />
    </item>
    
    
    </layer-list>