Android - Shadow

UpdateToolbarShadow.cs

void UpdateToolbarShadow(Android.Support.V7.Widget.Toolbar toolbar, bool hasShadow, Activity activity, Android.Graphics.Drawables.Drawable windowContent)
{
                var androidContent = activity?.Window?.DecorView?.FindViewById<FrameLayout>(Window.IdAndroidContent);
                if (androidContent != null)
                {
                    if (hasShadow && activity != null)
                    {

                        GradientDrawable shadowGradient = new GradientDrawable(GradientDrawable.Orientation.RightLeft, new int[] { Android.Graphics.Color.Transparent.ToArgb(), Android.Graphics.Color.Gray.ToArgb() });
                        shadowGradient.SetCornerRadius(0f);


                        androidContent.Foreground = shadowGradient;

                        toolbar.Elevation = 4;
                    }
                    else
                    {

                        androidContent.Foreground = windowContent;

                        toolbar.Elevation = 0;
                    }
                }
                
  }