在第一個運行的應用程序中顫動顯示黑屏

Question

此參考無法解決我的問題

在將 flutter 通道切換到master並升級 flutter 之后，這個問題在我的應用程序上沒有解決。 我該如何解決？

flutter doctor -v
[√] Flutter (Channel master, 1.22.0-10.0.pre.139, on Microsoft Windows [Version 10.0.19041.450], locale en-US)
    • Flutter version 1.22.0-10.0.pre.139 at F:\software\flutter
    • Framework revision 3dfbdac6f4 (3 hours ago), 2020-09-11 11:40:03 -0400
    • Engine revision 983b0ef164
    • Dart version 2.10.0 (build 2.10.0-116.0.dev)

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
    • Android SDK at F:\software\sdk
    • Platform android-30, build-tools 30.0.0
    • ANDROID_HOME = F:\software\sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Android Studio (version 4.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 49.0.2
    • Dart plugin version 193.7547
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (1 available)
    • WAS LX1A (mobile) • 2XJDU17C14006203 • android-arm64 • Android 8.0.0 (API 26)

新的flutter應用內容：

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), 
    );
  }
}

安卓style.xml ：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
        <!-- Show a splash screen on the activity. Automatically removed when
             Flutter draws its first frame -->
        <item name="android:windowBackground">@drawable/launch_background</item>
    </style>

    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
        <item name="android:windowBackground">@android:color/white</item>
    </style>
</resources>

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">
    <item android:drawable="@android:color/white" />

    <!-- You can insert your own image assets here -->
     <item>
        <bitmap
            android:gravity="center"
            android:src="@mipmap/ic_launcher" />
    </item>
</layer-list>

AndroidManifest.xml

<application
    android:name="io.flutter.app.FlutterApplication"
    android:label="instaluxury"
    android:icon="@mipmap/ic_launcher">
    <activity
        android:name=".MainActivity"
        android:launchMode="singleTop"
        android:theme="@style/LaunchTheme"
        android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
        android:hardwareAccelerated="true"
        android:windowSoftInputMode="adjustResize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
    <!-- Don't delete the meta-data below.
         This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
    <meta-data
        android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
        android:value="true" />
</application>

Answer 1

除非我遺漏了什么：您的應用程序在加載並准備好顯示 MyHomePage 之前一直顯示黑屏。 如果您沒有包含啟動畫面，這是正常行為。 您可以在官方文檔中閱讀有關添加啟動畫面的信息： https : //flutter.dev/docs/development/ui/advanced/splash-screen