Fix for XamSvg in a button on Xamarin Android Forms

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
					   xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:demo="clr-namespace:XamSvg.Demo;assembly=XamSvg.Demo"
             x:Class="XamSvg.Demo.MainPage"
             BackgroundColor="#E08080"
             Title="XamSvg Demo">

      <demo:MyButton x:Name="TestButton" Text="TestText" />

</ContentPage>

MainPage.xaml.cs

    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();

            //FileImageSource is sealed. We can currently not derive SvgImageSource from FileImageSource.
            var svg = new SvgImageSource { Svg = "res:images.hand", HeightRequest = 20,  ColorMapping = "ffffff=00ff00" };
            var image = svg.Image;

            TestButton.Image = svg.Image;
        }
  }
  

MyButton.cs

    public class MyButton : Button
    {
    }
    

MyButtonRenderer.Droid.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.Graphics.Drawables;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using XamSvg.Demo;
using XamSvg.Demo.Droid;
using Button = Xamarin.Forms.Button;

[assembly: ExportRenderer(typeof(MyButton), typeof(MyButtonRenderer))]

namespace XamSvg.Demo.Droid
{
    class MyButtonRenderer : ButtonRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);
            UpdateBitmap();
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == Button.ImageProperty.PropertyName)
                UpdateBitmap();
            else
                base.OnElementPropertyChanged(sender, e);
        }


        private void UpdateBitmap()
        {
            if (Element.Image != null && !string.IsNullOrEmpty(Element.Image.File))
            {
                var imagefile = Element.Image.File; 
                Drawable drawable;
                if (imagefile.StartsWith("res:"))
                {
                    var strings = imagefile.Split(',');
                    var file = strings[0];
                    var cm = strings[1];
                    drawable = SvgFactory.GetDrawableFromEmbeddedResource(file, SvgColorMapperFactory.FromString(cm));
                }
                else
                    drawable = Context.Resources.GetDrawable(imagefile);

                Control.SetCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null);
                if (drawable != null)
                    drawable.Dispose();
            }
            else
                Control.SetCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
        }
    }
}

@softlion thanks, I managed to make it load files from the filesystem, I'm positioning it here so maybe someone could improve on this to make it work with XamSvg.

public class ImageButtonRenderer : ButtonRenderer
{
	Context context;

	public ImageButtonRenderer(Context context) : base(context)
	{
		this.context = context;
	}

	protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
	{
		if (e.NewElement.Image != null && !string.IsNullOrEmpty(Element.Image.File))
		{
			var image = e.NewElement.Image;
			e.NewElement.Image = null;
			base.OnElementChanged(e);
			e.NewElement.Image = image;
		}
		else
			base.OnElementChanged(e);

		int padding = (int)Math.Round(((ImageButton)Element).Padding);
		Control.SetPadding(padding, padding, padding, padding);
		Control.SetBackground(null);
		Element.WidthRequest = Element.HeightRequest;
	}

	protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
	{
		if (e.PropertyName == Button.ImageProperty.PropertyName)
			UpdateBitmap();
		else
			base.OnElementPropertyChanged(sender, e);
	}

	private void UpdateBitmap()
	{
		if (Control == null)
			return;
		
		if (Element.Image != null && !string.IsNullOrEmpty(Element.Image.File))
		{
			var imagefile = Element.Image.File;

			var scale = context.Resources.DisplayMetrics.ScaledDensity;

			Drawable drawable = Drawable.CreateFromPath(imagefile);
			drawable.SetBounds(0, 0, (int)(scale * drawable.IntrinsicWidth), (int)(scale * drawable.IntrinsicHeight));

			Control.SetCompoundDrawables(drawable, null, null, null);

			if (drawable != null)
				drawable.Dispose();
		}
		else
			Control.SetCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
	}
}