ITブログ時々なんでもブログ

１．対応方法その１

<?xml version="1.0" encoding="UTF-8"?>
<resources>
  <style name="MyTheme.Splash" parent ="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@drawable/splash_screen</item>
    <!--Android12以降のスプラッシュスクリーンを無効にする-->
    <item name="android:windowIsTranslucent">true</item>
    <!--色々試した結果、以下は効果のない設定と思う
    <item name="windowSplashScreenAnimationDuration">0</item>
    <item name="windowSplashScreenAnimationDuration">1000</item>
    <item name="windowSplashScreenBackground">@color/transparent</item>
    <item name="windowSplashScreenAnimatedIcon">@color/transparent</item>
    <item name="android:backgroundDimEnabled">false</item>
    -->
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowActionBar">true</item>
  </style>
</resources>

２．対応方法その２

[Activity(Theme = "@style/MyTheme.Splash", MainLauncher = true,
                Name = "com.CompanyName.AppName.SplashActivity",
                Exported = true,
                NoHistory = true)]
    public class SplashActivity : AppCompatActivity
    {
        public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
        {
            AndroidX.Core.SplashScreen.SplashScreen screen = AndroidX.Core.SplashScreen.SplashScreen.InstallSplashScreen(this);
            base.OnCreate(savedInstanceState, persistentState);
        }
}