EntryView.cs

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

using Xamarin.Forms;

namespace MaterialTextField
{
    public class EntryView : View
    {
    }
}

MainPage.xaml

<?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:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             xmlns:cntrl="clr-namespace:MaterialTextField"
             x:Class="MaterialTextField.MainPage">

    <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
        <cntrl:EntryView WidthRequest="220" VerticalOptions="Center" HorizontalOptions="Center"/>
    </StackLayout>

</ContentPage>