new paste class

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

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android.AppCompat;

[assembly: ExportRenderer(typeof(NavigationPage), typeof(TransitionNavigationPage))]
namespace TestProject.Droid.Renderers
{
    public class TransitionNavigationPage : NavigationPageRenderer
    {
        public TransitionNavigationPage(Context context) : base(context)
        {
        }

        protected override void SetupPageTransition(Android.Support.V4.App.FragmentTransaction transaction, bool isPush)
        {
            if (isPush)
            {
                transaction.SetCustomAnimations(Resource.Animation.enter_right, Resource.Animation.exit_left,
                    Resource.Animation.enter_left, Resource.Animation.exit_right);
            }
            else
            {
                transaction.SetCustomAnimations(Resource.Animation.enter_right, Resource.Animation.exit_left,
                    Resource.Animation.enter_left, Resource.Animation.exit_right);
            }
        }
    }
}