[Activity(Label = "SampleApp", Icon = "@drawable/icon", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
    {
        App mainApp;
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);
            mainApp = new App();
            mainApp.ScreenWidth = (int)Resources.DisplayMetrics.WidthPixels;
            mainApp.ScreenHeight = (int)Resources.DisplayMetrics.HeightPixels;
            mainApp.LoadHomePage();


            LoadApplication(mainApp);
        }

        public override void OnConfigurationChanged(Android.Content.Res.Configuration newConfig)
        {
            base.OnConfigurationChanged(newConfig);

            mainApp.ScreenWidth = (int)Resources.DisplayMetrics.WidthPixels;
            mainApp.ScreenHeight = (int)Resources.DisplayMetrics.HeightPixels;
            mainApp.LoadHomePage();
        }
    }

int btnWidth = ScreenWidth / 5;
            StackLayout headerPaneLayout = new StackLayout();
            headerPaneLayout.Orientation = StackOrientation.Horizontal;
            headerPaneLayout.BackgroundColor = Color.Yellow;
            headerPaneLayout.Padding = new Thickness(0, 0, 0, 0);
            mainLayout.Children.Add(headerPaneLayout);

            Button btn1 = new Button();
            btn1 .Text = "Take Survey";
            btn1 .WidthRequest = btnWidth;
            btn1 .HorizontalOptions = LayoutOptions.Start;
            headerPaneLayout.Children.Add(btn1 );

            Button btn2 = new Button();
            btn2.Text = "PPE Product";
            btn2.WidthRequest = btnWidth;
            headerPaneLayout.Children.Add(btnPPEProduct);