Custom edit text control with clear button for Xamarin Android

CustomEditText.cs

public class CustomEditText : EditText {
        private Drawable clearButton;

        protected CustomEditText (IntPtr javaReference, JniHandleOwnership transfer) : base (javaReference, transfer) {
        }

        public CustomEditText (Context context) : base (context) {
            Init ();
        }

        public CustomEditText (Context context, IAttributeSet attrs) : base (context, attrs) {
            Init (attrs);
        }

        public CustomEditText (Context context, IAttributeSet attrs, int defStyle) : base (context, attrs, defStyle) {
            Init (attrs);
        }

        private void Init (IAttributeSet attrs = null) {
            var activity = ApplicationContext.Activity;
            if (activity == null)
                return;

            clearButton = ContextCompat.GetDrawable (Android.App.Application.Context, Resource.Drawable.forms_edit_text_clear_gray);
            clearButton.SetBounds (0, 0, clearButton.IntrinsicWidth, clearButton.IntrinsicHeight);

            SetupEvents ();
        }

        private void SetupEvents () {
            // Handle clear button visibility
            this.TextChanged += (sender, e) => {
                UpdateClearButton ();
            };
            this.FocusChange += (sender, e) => {
                UpdateClearButton (e.HasFocus);
            };

            // Handle clearing the text
            this.Touch += (sender, e) => {
                if (this.GetCompoundDrawables ()[2] == null || e.Event.Action != MotionEventActions.Up) {
                    e.Handled = false;
                    return;
                }
                if (e.Event.GetX () > (this.Width - this.PaddingRight - clearButton.IntrinsicWidth)) {
                    this.Text = "";
                    UpdateClearButton ();
                    e.Handled = true;
                } else
                    e.Handled = false;
            };
        }

        private void UpdateClearButton (bool hasFocus = true) {
            var compoundDrawables = this.GetCompoundDrawables ();
            var compoundDrawable = this.Text.Length == 0 || !hasFocus ? null : clearButton;
            this.SetCompoundDrawables (compoundDrawables[0], compoundDrawables[1], compoundDrawable, compoundDrawables[3]);
        }
	}