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using System;

using Xamarin.Forms;

using Xamarin.Forms.Xaml;

[assembly: XamlCompilation (XamlCompilationOptions.Compile)]

namespace App6

{

   public partial class App : Application

   {

       public App ()

       {

           InitializeComponent();

RelativeLayout rl = new RelativeLayout();

rl.Children.Add(new BoxView { Color = Color.Blue, WidthRequest = 150, HeightRequest = 150 }, Constraint.Constant(0), Constraint.Constant(0));

rl.Children.Add(new BoxView { Color = Color.Red, WidthRequest = 150, HeightRequest = 150 }, Constraint.RelativeToParent((Parent)=>Parent.Width-150), Constraint.Constant(0));

rl.Children.Add(new BoxView { Color = Color.Purple, WidthRequest = 150, HeightRequest = 150 }, Constraint.Constant(0), Constraint.RelativeToParent((Parent) => Parent.Height - 150));

rl.Children.Add(new BoxView { Color = Color.Yellow, WidthRequest = 150, HeightRequest = 150 }, Constraint.RelativeToParent((Parent) => Parent.Width - 150), Constraint.RelativeToParent((Parent) => Parent.Height - 150));

MainPage = new ContentPage { Content=rl};

}

protected override void OnStart ()

       {

           // Handle when your app starts

       }

protected override void OnSleep ()

       {

           // Handle when your app sleeps

       }

protected override void OnResume ()

       {

           // Handle when your app resumes

       }

   }

}

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