Fix splash screen background color in dark mode

uhabits-android/build.gradle.kts

@@ -128,6 +128,7 @@ dependencies {
     implementation("androidx.legacy:legacy-preference-v14:1.0.0")
     implementation("androidx.legacy:legacy-support-v4:1.0.0")
     implementation("com.google.android.material:material:1.10.0")
+    implementation("androidx.core:core-splashscreen:1.0.1")
     implementation("com.opencsv:opencsv:5.9")
     implementation(project(":uhabits-core"))
     kapt("com.google.dagger:dagger-compiler:$daggerVersion")

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

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016-2021 Álinson Santos Xavier <git@axavier.org>
+  ~
+  ~ This file is part of Loop Habit Tracker.
+  ~
+  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by the
+  ~ Free Software Foundation, either version 3 of the License, or (at your
+  ~ option) any later version.
+  ~
+  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~ more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<resources>
+    <color name="splash_screen_background">@color/grey_900</color>
+</resources>

uhabits-android/src/main/res/values-v31/styles.xml

@@ -0,0 +1,24 @@
+<!--
+  ~ Copyright (C) 2016-2021 Álinson Santos Xavier <git@axavier.org>
+  ~
+  ~ This file is part of Loop Habit Tracker.
+  ~
+  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by the
+  ~ Free Software Foundation, either version 3 of the License, or (at your
+  ~ option) any later version.
+  ~
+  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~ more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<resources>
+    <style name="AppBaseTheme" parent="@style/AppTheme">
+        <item name="android:windowSplashScreenBackground">@color/splash_screen_background</item>
+    </style>
+</resources>

uhabits-android/src/main/res/values/colors.xml

@@ -89,4 +89,5 @@
     </array>
 
     <color name="ic_launcher_background">#1976D2</color>
+    <color name="splash_screen_background">@color/grey_200</color>
 </resources>

uhabits-android/src/main/res/values/styles.xml

@@ -18,7 +18,7 @@
   -->
 
 <resources xmlns:tools="http://schemas.android.com/tools">
-    <style name="AppBaseTheme" parent="@style/Theme.MaterialComponents.Light.NoActionBar">
+    <style name="AppTheme" parent="@style/Theme.MaterialComponents.Light.NoActionBar">
         <item name="aboutScreenColor">@color/blue_800</item>
         <item name="actionBarPopupTheme">@style/ThemeOverlay.AppCompat.Light</item>
         <item name="actionModeBackground">@color/grey_700</item>
@@ -66,6 +66,10 @@
         <item name="dialogFormLabelColor">@color/white</item>
     </style>
 
+    <style name="AppBaseTheme" parent="@style/AppTheme">
+        <item name="windowSplashScreenBackground">@color/splash_screen_background</item>
+    </style>
+
     <style name="AppBaseThemeDark" parent="@style/ThemeOverlay.MaterialComponents.Dark.ActionBar">
         <item name="aboutScreenColor">@color/blue_300</item>
         <item name="actionModeBackground">@color/grey_800</item>