Canvas

//This example requires the 'Xamarin.Android GUI' option to be enabled
//+ref=Java.Interop
using System;
using System.Linq;
using System.Collections.Generic;
using NativeUiLib;
using Android.Graphics;

namespace CSharp_Shell
{

    public static class Program
    {
        public static void Main()
        {
            Ui.RunOnUiThread(()=> UiStuff());
        }

        private static void UiStuff()
        {
                var w = 800;
                var h = 600;
                var lay = new LinearLayout();

                var drawingImageView = new ImageView();
                lay.AddView(drawingImageView);


                var paint = new Paint();
                paint.Color = Color.Blue;
                paint.SetStyle(Paint.Style.Stroke);
                paint.StrokeWidth = 15;
                var bmpBase = Bitmap.CreateBitmap(w, h, Bitmap.Config.Argb8888);
                Canvas canvas = new Canvas(bmpBase);
                canvas.DrawCircle(100, 100, 30, paint);
                drawingImageView.SetImageBitmap(bmpBase);

                Ui.ShowLayout(lay);
        }
    }
}