Revert "fix(mobile): Generate 1 splash screen on Android (#1443)" (#1498)

This reverts commit 00630bd4a3.

mobile/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -1,6 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item>
-        <bitmap android:gravity="fill" android:src="@drawable/background"/>
-    </item>
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
 </layer-list>

mobile/android/app/src/main/res/drawable/launch_background.xml

@@ -1,6 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item>
-        <bitmap android:gravity="fill" android:src="@drawable/background"/>
-    </item>
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
 </layer-list>

mobile/android/app/src/main/res/values-night-v31/styles.xml

@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
-    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
-        <item name="android:forceDarkAllowed">false</item>
-        <item name="android:windowFullscreen">false</item>
-        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
-        <item name="android:windowSplashScreenAnimatedIcon">@drawable/android12splash</item>
-    </style>
-    <!-- Theme applied to the Android Window as soon as the process has started.
-         This theme determines the color of the Android Window while your
-         Flutter UI initializes, as well as behind your Flutter UI while its
-         running.
-         
-         This Theme is only used starting with V2 of Flutter's Android embedding. -->
-    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
-        <item name="android:windowBackground">?android:colorBackground</item>
-    </style>
-</resources>

mobile/android/app/src/main/res/values-v31/styles.xml

@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
-    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
-        <item name="android:forceDarkAllowed">false</item>
-        <item name="android:windowFullscreen">false</item>
-        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
-        <item name="android:windowSplashScreenAnimatedIcon">@drawable/android12splash</item>
-    </style>
-    <!-- Theme applied to the Android Window as soon as the process has started.
-         This theme determines the color of the Android Window while your
-         Flutter UI initializes, as well as behind your Flutter UI while its
-         running.
-         
-         This Theme is only used starting with V2 of Flutter's Android embedding. -->
-    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
-        <item name="android:windowBackground">?android:colorBackground</item>
-    </style>
-</resources>

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

@@ -5,9 +5,6 @@
         <!-- Show a splash screen on the activity. Automatically removed when
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
-        <item name="android:forceDarkAllowed">false</item>
-        <item name="android:windowFullscreen">false</item>
-        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your