Try to make icon nicer.

Progrart.Android/MainActivity.cs

@@ -9,6 +9,7 @@ namespace Progrart.Android;
     Label = "Progrart.Android",
     Theme = "@style/MyTheme.NoActionBar",
     Icon = "@drawable/icon",
+    RoundIcon = "@drawable/app_icon",
     MainLauncher = true,
     ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize | ConfigChanges.UiMode)]
 public class MainActivity : AvaloniaMainActivity<App>

Progrart.Android/Progrart.Android.csproj

@@ -2,9 +2,9 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net10.0-android</TargetFramework>
-    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+    <SupportedOSPlatformVersion>26</SupportedOSPlatformVersion>
     <Nullable>enable</Nullable>
-    <ApplicationId>com.CompanyName.Progrart</ApplicationId>
+    <ApplicationId>io.creeperlv.Progrart</ApplicationId>
     <ApplicationVersion>1</ApplicationVersion>
     <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
     <AndroidPackageFormat>apk</AndroidPackageFormat>
@@ -12,9 +12,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <AndroidResource Include="Icon.png">
+	  <AndroidResource Include="icon.png">
-      <Link>Resources\drawable\Icon.png</Link>
+		  <Link>Resources\drawable\icon.png</Link>
-    </AndroidResource>
+	  </AndroidResource>
+	  <AndroidResource Include="icon_fg.png">
+		  <Link>Resources\drawable\icon_fg.png</Link>
+	  </AndroidResource>
+	  <AndroidResource Include="icon_bg.png">
+		  <Link>Resources\drawable\icon_bg.png</Link>
+	  </AndroidResource>
   </ItemGroup>
 
   <ItemGroup>

Progrart.Android/Properties/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto">
 	<uses-permission android:name="android.permission.INTERNET" />
-	<application android:label="Progrart" android:icon="@drawable/Icon" />
+	<application android:label="Progrart" android:icon="@drawable/icon" android:roundIcon="@drawable/app_icon" />
 </manifest>

Progrart.Android/Resources/drawable/app_icon.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<adaptive-icon xmlns:android="http://schemas.microsoft.com/apk/res/android">
+	<background android:drawable="@drawable/icon_fg" />
+	<foreground android:drawable="@drawable/icon_bg" />
+</adaptive-icon>

Progrart.iOS/Info.plist

@@ -39,5 +39,7 @@
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
+	<key>XSAppIconAssets</key>
+	<string>Assets.xcassets/AppIcon.appiconset</string>
 </dict>
 </plist>