fix: splash screen (#39)

android/app/build.gradle

@@ -95,4 +95,5 @@ flutter {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation("androidx.core:core-splashscreen:1.0.1")
 }

android/app/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
             android:name=".MainActivity"
             android:exported="true"
             android:launchMode="singleTop"
-            android:theme="@style/LaunchTheme"
+            android:theme="@style/Theme.App.Starting"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">

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

@@ -1,6 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-
-
     <item android:drawable="@color/ic_launcher_background"/>
 </selector>

android/app/src/main/res/drawable/splash_screen.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:width="@dimen/splash_screen_icon_size"
+        android:height="@dimen/splash_screen_icon_size"
+        android:drawable="@mipmap/ic_launcher"
+        android:gravity="center" />
+</layer-list>

android/app/src/main/res/values/dimens.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Round app icon can take all of default space -->
+    <dimen name="splash_screen_icon_size">48dp</dimen>
+</resources>

android/app/src/main/res/values/ic_launcher_background.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="ic_launcher_background">#010101</color>
+    <color name="ic_launcher_background">#000000</color>
 </resources>

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

@@ -1,12 +1,5 @@
 <?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">
-        <!-- 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:windowSwipeToDismiss">false</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
@@ -22,4 +15,22 @@
         <item name="android:windowSwipeToDismiss">false</item>
     </style>
 
+
+    <style name="Theme.App.Starting" parent="Theme.SplashScreen.IconBackground">
+        <!-- Set the splash screen background, animated icon, and animation
+        duration. -->
+        <item name="windowSplashScreenBackground">@color/ic_launcher_background</item>
+
+        <!-- Use windowSplashScreenAnimatedIcon to add a drawable or an animated
+             drawable. One of these is required. -->
+        <item name="windowSplashScreenAnimatedIcon">@drawable/splash_screen</item>
+        <item name="windowSplashScreenIconBackgroundColor">@android:color/white</item>
+
+
+        <!-- Set the theme of the Activity that directly follows your splash
+        screen. This is required. -->
+        <item name="postSplashScreenTheme">@style/NormalTheme</item>
+    </style>
+
+
 </resources>