Add main splash screen

android/app/src/main/AndroidManifest.xml

@@ -42,6 +42,11 @@
                  there is no splash screen (such as the default splash screen
                  defined in @style/LaunchTheme). -->
 
+            <meta-data
+                android:name="io.flutter.embedding.android.NormalTheme"
+                android:resource="@style/NormalTheme"
+                />
+
             <!-- Specify that the launch screen should continue being displayed -->
             <!-- until Flutter renders its first frame. -->
             <meta-data

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

@@ -1,12 +1,16 @@
 <?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 android:drawable="@android:color/white" />
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="#1C227E" />
+        </shape>
+    </item>
 
     <!-- You can insert your own image assets here -->
-    <!-- <item>
+    <item>
         <bitmap
             android:gravity="center"
-            android:src="@mipmap/launch_image" />
-    </item> -->
+            android:src="@drawable/splash_icon" />
+    </item>
 </layer-list>

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

@@ -5,4 +5,9 @@
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
     </style>
+
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">@android:color/white</item>
+    </style>
+
 </resources>