Use Android 12 splash screen

app/src/main/java/eu/faircode/email/ActivityMain.java

@@ -25,6 +25,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 
 import androidx.fragment.app.FragmentManager;
@@ -135,12 +136,14 @@ public class ActivityMain extends ActivityBase implements FragmentManager.OnBack
             final SimpleTask<Boolean> boot = new SimpleTask<Boolean>() {
                 @Override
                 protected void onPreExecute(Bundle args) {
-                    getMainHandler().postDelayed(splash, SPLASH_DELAY);
+                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S)
+                        getMainHandler().postDelayed(splash, SPLASH_DELAY);
                 }
 
                 @Override
                 protected void onPostExecute(Bundle args) {
-                    getMainHandler().removeCallbacks(splash);
+                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S)
+                        getMainHandler().removeCallbacks(splash);
                     getWindow().setBackgroundDrawable(null);
                 }
 

app/src/main/res/values/styles.xml

@@ -27,6 +27,13 @@
     <style name="AppThemeBaseLight" parent="Base.Theme.AppCompat.Light.DarkActionBar">
         <item name="themeName">light</item>
         <item name="android:forceDarkAllowed" tools:targetApi="q">false</item>
+        <item name="android:windowSplashScreenBackground" tools:targetApi="s">
+            @android:color/darker_gray
+        </item>
+        <item name="android:windowSplashScreenAnimatedIcon" tools:targetApi="s">
+            @mipmap/ic_launcher_round
+        </item>
+
         <item name="android:windowDisablePreview">true</item>
         <item name="android:windowAnimationStyle">@style/activityAnimationStyle</item>
 
@@ -72,6 +79,13 @@
     <style name="AppThemeBaseDark" parent="Base.Theme.AppCompat">
         <item name="themeName">dark</item>
         <item name="android:forceDarkAllowed" tools:targetApi="q">false</item>
+        <item name="android:windowSplashScreenBackground" tools:targetApi="s">
+            @android:color/darker_gray
+        </item>
+        <item name="android:windowSplashScreenAnimatedIcon" tools:targetApi="s">
+            @mipmap/ic_launcher_round
+        </item>
+
         <item name="android:windowDisablePreview">true</item>
         <item name="android:windowAnimationStyle">@style/activityAnimationStyle</item>