Add SetContentView to draw view

src/Android/Avalonia.AndroidTestApplication/MainActivity.cs

@@ -1,11 +1,15 @@
 using Android.App;
 using Android.Content.PM;
 using Android.OS;
+using Android.Views;
 using Avalonia.Android;
 using Avalonia.Android.Platform.Specific;
 using Avalonia.Android.Platform.Specific.Helpers;
+using Avalonia.Controls;
 using Avalonia.Controls.Platform;
+using Avalonia.Media;
 using Avalonia.Platform;
+using Avalonia.Skia.Android;
 using TestApplication;
 
 namespace Avalonia.AndroidTestApplication
@@ -26,6 +30,7 @@ namespace Avalonia.AndroidTestApplication
         {
             base.OnCreate(savedInstanceState);
 
+            /*
             App app;
             if (Avalonia.Application.Current != null)
                 app = (App)Avalonia.Application.Current;
@@ -38,7 +43,83 @@ namespace Avalonia.AndroidTestApplication
 
             window.Show();
             app.Run(window);
+            */
+
+
+
+            App app;
+            if (Avalonia.Application.Current != null)
+                app = (App)Avalonia.Application.Current;
+            else
+            {
+                app = new App();
+                AppBuilder.Configure(app)
+                    .UseAndroid()
+                    .UseSkia()
+                    .SetupWithoutStarting();
+            }
+
+            SetContentView(new MainView(this));
+
+
         }
-        
+
+
+
+
+
+        class MainView : SkiaRenderView
+        {
+            float _radians = 0;
+            public MainView(Activity context) : base(context)
+            {
+            }
+
+            protected override void OnRender(DrawingContext ctx)
+            {
+                ctx.FillRectangle(Brushes.Green, new Rect(0, 0, Width, Height));
+
+                var rc = new Rect(0, 0, Width / 3, Height / 3);
+                using (ctx.PushPostTransform(
+                    Avalonia.Matrix.CreateTranslation(-Width / 6, -Width / 6) *
+                    Avalonia.Matrix.CreateRotation(_radians) *
+                                             Avalonia.Matrix.CreateTranslation(Width / 2, Height / 2)))
+                {
+                    ctx.FillRectangle(new LinearGradientBrush()
+                    {
+                        GradientStops =
+                        {
+                            new GradientStop() {Color = Colors.Blue},
+                            new GradientStop(Colors.Red, 1)
+                        }
+                    }, rc, 5);
+                }
+
+
+            }
+
+            public override bool OnTouchEvent(MotionEvent e)
+            {
+                if (e.Action == MotionEventActions.Down)
+                    return true;
+                if (e.Action == MotionEventActions.Move)
+                {
+                    _radians = (e.RawY + e.RawY) / 100;
+                    Invalidate();
+                    return true;
+                }
+                return base.OnTouchEvent(e);
+            }
+        }
+
+
+
+
+
+
+
+
+
+
     }
 }