[Xamarin forms] A button with custom renderer for Android.

Button.cs

using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;

namespace GoiXe.CustomControls.Common
{
    public class Button2 : Xamarin.Forms.Button
    {
        public enum TextAlignment
        {
            Start, 
            End,
            Center
        }
        public string ImageLeft { get; set; }
        public string ImageRight { get; set; }
        public string ImageTop { get; set; }
        public string ImageBottom { get; set; }
        public bool IsTextUppercase { get; set; } = false;
        public TextAlignment VerticalTextAlignment { get; set; } = TextAlignment.Center;
        public TextAlignment HorizontalTextAlignment { get; set; } = TextAlignment.Start;
        public int BgResourceId { get; set; }
        public Thickness Padding { get; set; } = new Thickness(0);
    }
}

ButtonRenderer.cs

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

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Content.Res;
using Android.Graphics;
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 Xamarin.Forms.Xaml;

[assembly: ExportRenderer(typeof(GoiXe.CustomControls.Common.Button2), typeof(GoiXe.Droid.CustomRenderers.Common.Button2Renderer))]
namespace GoiXe.Droid.CustomRenderers.Common
{
    class Button2Renderer : Xamarin.Forms.Platform.Android.ButtonRenderer
    {
        private Android.Widget.Button androidButton;
        private GoiXe.CustomControls.Common.Button2 myButton;

#pragma warning disable 618
        public Button2Renderer() : base()
#pragma warning restore 618
        {
        }

        public Button2Renderer(Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
        {
            base.OnElementChanged(e);
            if (Control != null)
            {
                androidButton = Control as Android.Widget.Button;
            }
            else
            {
                androidButton = CreateNativeControl();
                SetNativeControl(androidButton);
            }

            if (e.OldElement != null)
                myButton = e.OldElement as GoiXe.CustomControls.Common.Button2;
            if (e.NewElement != null)
                myButton = e.NewElement as GoiXe.CustomControls.Common.Button2;
            if (Element != null)
                myButton = Element as GoiXe.CustomControls.Common.Button2;

            androidButton.LayoutParameters.Width = LayoutParams.WrapContent;
            androidButton.SetAllCaps(myButton.IsTextUppercase);
            androidButton.SetPadding((int)myButton.Padding.Left, (int)myButton.Padding.Top, (int)myButton.Padding.Right, (int)myButton.Padding.Bottom);
            androidButton.CompoundDrawablePadding = 2;
            //androidButton.SetPaddingRelative(0, 0, 0, 0);
            switch (myButton.VerticalTextAlignment)
            {
                case CustomControls.Common.Button2.TextAlignment.Center:
                    androidButton.Gravity = GravityFlags.CenterVertical;
                    break;
                case CustomControls.Common.Button2.TextAlignment.Start:
                    androidButton.Gravity = GravityFlags.Top;
                    break;
                case CustomControls.Common.Button2.TextAlignment.End:
                    androidButton.Gravity = GravityFlags.Bottom;
                    break;
                default:
                    break;
            }

            switch (myButton.HorizontalTextAlignment)
            {
                case CustomControls.Common.Button2.TextAlignment.Center:
                    androidButton.Gravity |= GravityFlags.CenterHorizontal;
                    break;
                case CustomControls.Common.Button2.TextAlignment.Start:
                    androidButton.Gravity |= GravityFlags.Left;
                    break;
                case CustomControls.Common.Button2.TextAlignment.End:
                    androidButton.Gravity |= GravityFlags.Right;
                    break;
                default:
                    break;
            }
            androidButton.TextAlignment = Android.Views.TextAlignment.Gravity;
            if (myButton.BgResourceId > 0)
                androidButton.SetBackgroundResource(myButton.BgResourceId);
            else
                androidButton.SetBackgroundResource(Resource.Drawable.story_poster_button_states);
            Drawable drawableLeft = null, drawableRight = null, drawableTop = null, drawableBottom = null;
#pragma warning disable CS0618 // Type or member is obsolete
            if (myButton.ImageLeft?.Length > 0)
            {
            /*
                int resource = Resources.GetIdentifier(myButton.ImageLeft, "drawable", Context.PackageName);
                drawableLeft = Resources.GetDrawable(resource);
            */
                string resourceName = myButton.ImageLeft.ToLower().Remove(myButton.ImageLeft.Length - 4);
                int id = (int) typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
                drawableLeft = Resources.GetDrawable(id);
            }

            if (myButton.ImageRight?.Length > 0)
            {
                //int resource = Resources.GetIdentifier(myButton.ImageRight, "drawable", Context.PackageName);
                //drawableRight = Resources.GetDrawable(resource);
                string resourceName = myButton.ImageRight.ToLower().Remove(myButton.ImageRight.Length - 4);
                int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
                drawableRight = Resources.GetDrawable(id);
            }
            if (myButton.ImageTop?.Length > 0)
            {
                //int resource = Resources.GetIdentifier(myButton.ImageTop, "drawable", Context.PackageName);
                //drawableTop = Resources.GetDrawable(resource);
                string resourceName = myButton.ImageTop.ToLower().Remove(myButton.ImageTop.Length - 4);
                int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
                drawableTop = Resources.GetDrawable(id);
            }
            if (myButton.ImageBottom?.Length > 0)
            {
                //int resource = Resources.GetIdentifier(myButton.ImageBottom, "drawable", Context.PackageName);
                //drawableBottom = Resources.GetDrawable(resource);
                string resourceName = myButton.ImageBottom.ToLower().Remove(myButton.ImageBottom.Length - 4);
                int id = (int)typeof(Resource.Drawable).GetField(resourceName).GetValue(null);
                drawableBottom = Resources.GetDrawable(id);
            }
#pragma warning restore CS0618 // Type or member is obsolete
                androidButton.SetCompoundDrawablesWithIntrinsicBounds(drawableLeft, drawableTop, drawableRight, drawableBottom);
            //androidButton.StateListAnimator = null;
        }
    }
}