for Android

MyEntryRenderer.cs

using Android.Content;
using Android.Content.Res;
using Android.Graphics;
using Android.Graphics.Drawables;
using Android.OS;
using Android.Runtime;
using Android.Support.V4.Content;
using Android.Widget;

using EntryAccent;
using EntryAccent.Droid.Renderers;

using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace EntryAccent.Droid.Renderers
{
    class MyEntryRenderer : EntryRenderer
    {
        public MyEntryRenderer(Context context) : base(context)
        { }

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control == null || e.NewElement == null) return;

            if (e.NewElement is MyEntry customEntry)
            {
                Control.SetHighlightColor(color: customEntry.MyHighlightColor.ToAndroid());

                JNIEnv.SetField(Control.Handle, JNIEnv.GetFieldID(JNIEnv.FindClass(typeof(TextView)), "mCursorDrawableRes", "I"), 0);
                TextView textViewTemplate = new TextView(Control.Context);

                var field           = textViewTemplate.Class.GetDeclaredField("mEditor");
                field.Accessible    = true;
                var editor          = field.Get(Control);

                string[]
                fieldsNames     = { "mTextSelectHandleLeftRes", "mTextSelectHandleRightRes",    "mTextSelectHandleRes"  },
                drawablesNames  = { "mSelectHandleLeft",        "mSelectHandleRight",           "mSelectHandleCenter"   };

                for (int index = 0; index < fieldsNames.Length && index < drawablesNames.Length; index++)
                {
                    field                   = textViewTemplate.Class.GetDeclaredField(fieldsNames[index]);
                    field.Accessible        = true;
                    Drawable handleDrawable = ContextCompat.GetDrawable(Context, field.GetInt(Control));                    

                    handleDrawable.SetColorFilter(new PorterDuffColorFilter(customEntry.MyHandleColor.ToAndroid(), PorterDuff.Mode.SrcIn));

                    field            = editor.Class.GetDeclaredField(drawablesNames[index]);
                    field.Accessible = true;
                    field.Set(editor, handleDrawable);
                }

                if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
                {
                    Control.BackgroundTintList = ColorStateList.ValueOf(customEntry.MyTintColor.ToAndroid());
                }
                else
                {
                    Control.Background.SetColorFilter(new PorterDuffColorFilter(customEntry.MyTintColor.ToAndroid(), PorterDuff.Mode.SrcAtop));
                }
            }
        }
    }
}