Avalonia/samples/MobileSandbox.Android/Resources/values-v31/styles.xml

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

  <style name="MyTheme">
  </style>

  <style name="MyTheme.NoActionBar" parent="@style/Theme.AppCompat.NoActionBar">
    <item name="android:windowActionBar">false</item>
    <item name="android:windowBackground">@null</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowSplashScreenBackground">@color/splash_background</item>
    <item name="android:windowSplashScreenAnimatedIcon">@drawable/avalonia_anim</item>
    <item name="android:windowSplashScreenAnimationDuration">1000</item>

  </style>
</resources>