Add background color to xamarin android view

BackgroundExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.Graphics;
using Android.Graphics.Drawables;
using Android.OS;
using Android.Runtime;
using Android.Support.V4.Graphics.Drawable;
using Android.Views;
using Android.Widget;
using Xamarin.Forms.Platform.Android;
using static Android.Graphics.Shader;

namespace Droid.Extensions
{
    public static class BackgroundExtension
    {
        public static LinearGradient CreateLinearGradient(Color startColor, Color endColor, Color centerColor, float width, float height)
        {
            return new LinearGradient(0, height/2, width, height/2,
                new int[] { startColor, centerColor, endColor },
                null,
                TileMode.Mirror
                );
        }
        public static Drawable CreateBackgroundColor(Color color, float cornerRadius)
        {
            GradientDrawable drawble = new GradientDrawable();
            drawble.SetShape(ShapeType.Rectangle);
            drawble.SetCornerRadius(cornerRadius);
            drawble.SetColors(new int[] { color, color });
            return drawble;
        }
        public static Drawable CreateBackgroundGradient(Color startColor, Color endColor, Color centerColor,
            float cornerRadius, GradientDrawable.Orientation orientation)
        {
            GradientDrawable gradientDrawable = new GradientDrawable();
            gradientDrawable.SetShape(ShapeType.Rectangle);
            gradientDrawable.SetCornerRadius(cornerRadius);
            if (centerColor != Xamarin.Forms.Color.Transparent.ToAndroid())
            {
                gradientDrawable.SetColors(new int[] { startColor,
                centerColor,endColor});
            }
            else
            {
                gradientDrawable.SetColors(new int[] { startColor, endColor });
            }
            gradientDrawable.SetGradientType(GradientType.LinearGradient);
            gradientDrawable.SetOrientation(orientation);
            return gradientDrawable;
        }
        public static Drawable CreateBackgroundBitmap(string image, int height, int width, float cornerRadius)
        {
            var bitmap = Application.Context.Resources.GetBitmap(image);
            if (bitmap != null)
            {
                width = (int)(bitmap.Width * height / bitmap.Height);
                bitmap = Bitmap.CreateScaledBitmap(bitmap, width, height, false);
                var dr = RoundedBitmapDrawableFactory.Create(Application.Context.Resources, bitmap);
                dr.CornerRadius = cornerRadius;
                dr.Mutate().SetAlpha(40);
                return dr;
            }
            return null;
        }
    }
}

ShadowExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.Content.Res;
using Android.Graphics;
using Android.Graphics.Drawables;
using Android.Graphics.Drawables.Shapes;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Forms.Platform.Android;

namespace Droid.Extensions
{
    public static class ShadowExtension
    {
        public static Drawable CreateShadow(View view)
        {
            int elevationValue = 10;
            Rect shapeDrawablePadding = new Rect();
            shapeDrawablePadding.Left = elevationValue;
            shapeDrawablePadding.Right = elevationValue;
            shapeDrawablePadding.Top = elevationValue;
            shapeDrawablePadding.Bottom = elevationValue;
            int DY = 0;

            ShapeDrawable shapeDrawable = new ShapeDrawable();
            shapeDrawable.SetPadding(shapeDrawablePadding);


            shapeDrawable.Paint.Color = Color.Red;

            shapeDrawable.Paint.SetShadowLayer(12 / 3, 0, DY, Color.Red);



            view.SetLayerType(LayerType.Software, shapeDrawable.Paint);



            shapeDrawable.Shape = new RoundRectShape(new float[] { 12, 12, 12, 12, 12, 12, 12, 12 }, null, null);



            LayerDrawable drawable = new LayerDrawable(new Drawable[] { shapeDrawable });

            drawable.SetLayerInset(0, elevationValue, elevationValue * 2, elevationValue, elevationValue * 2);
            drawable.SetAlpha(40);


            return drawable;
        }
    }
}