Added do-nothing iOS and Android window icon support.

src/Android/Avalonia.Android/AndroidPlatform.cs

@@ -11,10 +11,11 @@ using Avalonia.Skia;
 using System;
 using System.Collections.Generic;
 using Avalonia.Android.Platform.SkiaPlatform;
+using System.IO;
 
 namespace Avalonia.Android
 {
-    public class AndroidPlatform : IPlatformSettings, IWindowingPlatform
+    public class AndroidPlatform : IPlatformSettings, IWindowingPlatform, IPlatformIconLoader
     {
         public static readonly AndroidPlatform Instance = new AndroidPlatform();
         public Size DoubleClickSize => new Size(4, 4);
@@ -65,5 +66,15 @@ namespace Avalonia.Android
         {
             throw new NotImplementedException();
         }
+
+        public IIconImpl LoadIcon(string fileName)
+        {
+            return null;
+        }
+
+        public IIconImpl LoadIcon(Stream stream)
+        {
+            return null;
+        }
     }
 }

src/Android/Avalonia.Android/Platform/SkiaPlatform/WindowImpl.cs

@@ -180,5 +180,10 @@ namespace Avalonia.Android.Platform.SkiaPlatform
         {
             Paint?.Invoke(new Rect(new Point(0, 0), ClientSize));
         }
+
+        public void SetIcon(IIconImpl icon)
+        {
+            // No window icons for mobile platforms
+        }
     }
 }

src/iOS/Avalonia.iOS/Avalonia.iOS.csproj

@@ -39,6 +39,7 @@
     <Compile Include="Extensions.cs" />
     <Compile Include="iOSPlatform.cs" />
     <Compile Include="AvaloniaView.cs" />
+    <Compile Include="PlatformIconLoader.cs" />
     <Compile Include="PlatformSettings.cs" />
     <Compile Include="PlatformThreadingInterface.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

src/iOS/Avalonia.iOS/AvaloniaView.cs

@@ -214,7 +214,9 @@ namespace Avalonia.iOS
             }
         }
 
-
+        public void SetIcon(IIconImpl icon)
+        {
+        }
     }
 
     class AvaloniaViewController : UIViewController

src/iOS/Avalonia.iOS/PlatformIconLoader.cs

@@ -0,0 +1,21 @@
+using Avalonia.Platform;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace Avalonia.iOS
+{
+    class PlatformIconLoader : IPlatformIconLoader
+    {
+        public IIconImpl LoadIcon(Stream stream)
+        {
+            return null;
+        }
+
+        public IIconImpl LoadIcon(string fileName)
+        {
+            return null;
+        }
+    }
+}

src/iOS/Avalonia.iOS/iOSPlatform.cs

@@ -61,7 +61,8 @@ namespace Avalonia.iOS
                 .Bind<IKeyboardDevice>().ToConstant(KeyboardDevice)
                 .Bind<IMouseDevice>().ToConstant(MouseDevice)
                 .Bind<IPlatformSettings>().ToSingleton<PlatformSettings>()
-                .Bind<IPlatformThreadingInterface>().ToConstant(PlatformThreadingInterface.Instance);
+                .Bind<IPlatformThreadingInterface>().ToConstant(PlatformThreadingInterface.Instance)
+                .Bind<IPlatformIconLoader>().ToSingleton<PlatformIconLoader>();
         }
     }
 }