Xamarin Custom Renderer Spinner-like DropDown

using Android.Content;
using Android.Graphics;
using Android.Graphics.Drawables;
using Selectron.Field.RouteTracker.Droid.Renderers;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(Picker), typeof(CustomPickerRenderer_Droid))]
namespace Selectron.Field.RouteTracker.Droid.Renderers
{
    public class CustomPickerRenderer_Droid : PickerRenderer
    {
#pragma warning disable CS0618 // Type or member is obsolete
        public CustomPickerRenderer_Droid() : base()
        {
        }
#pragma warning restore CS0618 // Type or member is obsolete
        public CustomPickerRenderer_Droid(Context context) : base(context)
        {
        }
        protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
        {
            base.OnElementChanged(e);
            if (e.OldElement == null)
            {
                Control?.SetBackgroundColor(Android.Graphics.Color.Transparent);
                var nativeEditText = Control;
                var shape = new ShapeDrawable(new Android.Graphics.Drawables.Shapes.RectShape());
                shape.Paint.Color = Android.Graphics.Color.Gray;
                shape.Paint.SetStyle(Paint.Style.Stroke);
                nativeEditText.Background = shape;
            }
        }
    }
}