Xamarin Android DotsIndicator View

activity.xml

<DroidDotIndicator.DotsIndicator
	android:id="@+id/indicator"
	android:layout_width="match_parent"
	android:layout_height="wrap_content" />

DotsIndicator.cs

using System;
using Android.Content;
using Android.Graphics;
using Android.Graphics.Drawables;
using Android.Runtime;
using Android.Util;
using Android.Widget;

namespace DroidDotIndicator
{
    [Register("DroidDotIndicator.DotsIndicator")]
    public class DotsIndicator : LinearLayout
    {
        private int _pagesCount;
        private int _selectedPage = -1;

        #region def ctors
        public DotsIndicator(Context context) :
            base(context)
        {
            Initialize();
        }

        public DotsIndicator(Context context, IAttributeSet attrs) :
            base(context, attrs)
        {
            Initialize();
        }

        public DotsIndicator(Context context, IAttributeSet attrs, int defStyle) :
            base(context, attrs, defStyle)
        {
            Initialize();
        }
        #endregion

        void Initialize()
        {
        }

        public int IndicatorSize { get; set; } = 40;
        public int IndicatorColor { get; set; } = Color.Transparent;
        public Color IndicatorBorderColor { get; set; } = Color.Black;
        public int IndicatorSelectedColor { get; set; } = Color.Red;

        public int PagesCount
        {
            set
            {
                _pagesCount = value;
                RemoveAllViews();
                SetupPagerIndidcatorDots();
            }
        }

        public int SelectedPage
        {
            set
            {
                if (value < 0 || value > _pagesCount - 1)
                {
                    throw new ArgumentException($"Incorrect index: {value}, max: {_pagesCount - 1}", nameof(value));
                }

                if (_selectedPage >= 0)
                {
                    SelectIndicator(false);
                }

                _selectedPage = value;

                SelectIndicator(true);
            }
        }

        private void SetupPagerIndidcatorDots()
        {
            for (var i = 0; i < _pagesCount; i++)
            {
                var image = new ImageView(Context);
                image.LayoutParameters = CreateIndicatorLayoutParams();
                image.SetImageDrawable(CreateDefaultIndicator());
                AddView(image);
            }
        }

        private void SelectIndicator(bool selected)
        {
            var selectedImage = (ImageView)GetChildAt(_selectedPage);
            var drawable = selected ? CreateSelectedIndicator() : CreateDefaultIndicator();
            selectedImage.SetImageDrawable(drawable);
        }

        protected virtual LayoutParams CreateIndicatorLayoutParams()
        {
            var layoutParams = new LayoutParams(IndicatorSize, IndicatorSize);
            layoutParams.SetMargins(5, 0, 5, 0);
            return layoutParams;
        }

        protected virtual Drawable CreateDefaultIndicator()
        {
            var drawable = CreateBaseIndicator();
            drawable.SetColor(IndicatorColor);
            return drawable;
        }

        protected virtual Drawable CreateSelectedIndicator()
        {
            var drawable = CreateBaseIndicator();
            drawable.SetColor(IndicatorSelectedColor);
            return drawable;
        }

        protected virtual GradientDrawable CreateBaseIndicator()
        {
            var drawable = new GradientDrawable();
            drawable.SetShape(ShapeType.Oval);
            drawable.SetStroke(1, IndicatorBorderColor);
            return drawable;
        }
    }
}

DotsIndicator_Activity.cs

_indicator = FindViewById<DotsIndicator>(Resource.Id.indicator);
_indicator.PagesCount = 5;
_indicator.SelectedPage = 4;