编辑:解决方案: https ://stackoverflow.com/a/71396586/18197688
如果我更改应用程序图标(ic_launcher.png),那么它将显示在启动屏幕上,但应用程序图标也会更改。
感觉好像有一些隐藏的设置将图标集中在启动屏幕上。背景颜色改变作品。
使用 io.flutter.embedding.android.SplashScreenDrawable 也可以,但我知道不鼓励这样做。
我的launch_background.xml
    <?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <bitmap android:gravity="fill" android:src="@drawable/background"/>
    </item>
</layer-list>
我在drawable-v21中的launch_background.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <bitmap android:gravity="fill" android:src="@drawable/background"/>
    </item>
</layer-list>
我的安卓清单:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.my_app">
    <uses-permission android:name="android.permission.INTERNET" />
   <application
        android:label="my_app"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:theme="@style/LaunchTheme"
            android:exported="true"
            android:launchMode="singleTop"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <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="flutterEmbedding"
            android:value="2" />
    </application>
    
</manifest>
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