use DayNight theme for splas screen

it doesn’t seem to be possible to make the splash screen use the configured
theme but we can follow the system’s theme on supported Android versions

src/main/res/drawable/background.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <item android:drawable="@color/grey50"/>
+    <item android:drawable="@color/splash_screen_background" />
 
     <item>
         <bitmap

src/main/res/values-night/colors.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="splash_screen_background">#ff424242</color> <!-- gray800 -->
+    <color name="splash_screen_status_bar">#ff282828</color> <!-- gray900 -->
+</resources>

src/main/res/values/colors.xml

@@ -40,5 +40,8 @@
 	<!-- scanner -->
 	<color name="scan_result_dots">#c04CAF50</color>
 
+	<color name="splash_screen_background">#fffafafa</color> <!-- gray50 -->
+	<color name="splash_screen_status_bar">#ffe0e0e0</color> <!-- gray300 -->
+
 	<color name="blue500">#ff2196f3</color>
 </resources>

src/main/res/values/themes.xml

@@ -363,8 +363,8 @@
         <item name="android:navigationBarColor" tools:targetApi="21">@color/black</item>
     </style>
 
-    <style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
-        <item name="colorPrimaryDark">@color/grey300</item>
+    <style name="SplashTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
+        <item name="colorPrimaryDark">@color/splash_screen_status_bar</item>
         <item name="android:windowBackground">@drawable/background</item>
     </style>