quickbuild/templates/Flutter Application/android/app/src/main/res/values/styles.xml

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<?xml version="1.0" encoding="utf-8"?>
<resources>

    <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>
    </style>
</resources>