Xamarin android custom view with arcore - xamarin.forms

Question

I looked at this video to make a simple AR with Arcore for Android:
Augmented Reality with Arcore
Everything went well, but now I want to see this in xamarin forms, in a custom view.
But I can not :(
what i tried last:
In Forms:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:FormsAR.Controls"
x:Class="FormsAR.MainPage">
<StackLayout BackgroundColor="Red" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
<Label BackgroundColor="Blue" TextColor="White" Text="JUST TEST"/>
<controls:ARView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" BackgroundColor="Yellow"/>
</StackLayout>
</ContentPage>
And:
using System;
using Xamarin.Forms;
namespace FormsAR.Controls
{
public class ARView : View
{
}
}
And Android:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="#+id/fragmentAR"
android:name="com.google.ar.sceneform.ux.ArFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
and finally:
[assembly: ExportRenderer(typeof(ARView), typeof(ARViewRenderer))]
namespace FormsAR.Droid.Controls
{
public class ARViewRenderer : ViewRenderer<ARView, Android.Views.View>
{
private ArFragment arFragment;
private Material readyColor;
Android.Views.View _view;
public ARViewRenderer(Context context) : base(context){}
protected override void OnElementChanged(ElementChangedEventArgs<ARView> e)
{
base.OnElementChanged(e);
_view = LayoutInflater.From(this.Context).Inflate(Resource.Layout.ARLayout, null, false);
AddView(_view);
if (Control == null)
{
Initialize();
}
}
private void Initialize()
{
var activity = this.Context as AppCompatActivity;
arFragment = (ArFragment)activity.SupportFragmentManager.FindFragmentById(Resource.Id.fragmentAR);
setupPlane();
MaterialFactory.MakeOpaqueWithColor(Context, new Google.AR.Sceneform.Rendering.Color(Android.Graphics.Color.Yellow)).GetAsync().ContinueWith(materialTask =>
{
readyColor = (Material)materialTask.Result;
});
}
private void setupPlane()
{
arFragment.TapArPlane += (sender, args) => this.OnTapArPlaneListener(args.HitResult, args.Plane, args.MotionEvent);
}
private void OnTapArPlaneListener(HitResult hitResult, Plane plane, MotionEvent motionEvent)
{
Anchor anchor = hitResult.CreateAnchor();
AnchorNode anchorNode = new AnchorNode(anchor);
anchorNode.SetParent(arFragment.ArSceneView.Scene);
CreateModel(anchorNode);
}
private void CreateModel(AnchorNode anchorNode)
{
TransformableNode node = new TransformableNode(arFragment.TransformationSystem);
node.SetParent(anchorNode);
var nodeRenderable = ShapeFactory.MakeSphere(0.08f, new Google.AR.Sceneform.Math.Vector3(0.0f, 0.15f, 0.0f), readyColor);
node.Renderable = nodeRenderable;
node.Select();
}
}
}
but i can't see:
image result
Link for project
Can you please help me identify where error?