MainActivity.cs

using System;
using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;


#if DEBUG
[assembly: Application(Debuggable = true)]
#else
[assembly: Application(Debuggable = false)]
#endif
namespace TestApp.Droid
{
    [Activity(Label = "TestApp", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;
            
            base.OnCreate(savedInstanceState);


            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
            LoadApplication(new App());

            // SET THIS FLAG TO PREVENT SCREENSHOTS AND TO DISPLAY A WHITE FRAME WHEN THE APP IS IN BACKGROUND
            // BE AWARE THERE ARE SOME INTERESTING LIMITATIONS: https://commonsware.com/blog/2016/06/06/psa-flag-secure-window-leaks.html
            Window.SetFlags(WindowManagerFlags.Secure, WindowManagerFlags.Secure);
        }

        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }

        public override void OnUserInteraction()
        {
            base.OnUserInteraction();

            SessionManager.Instance.ExtendSession();
        }
    }
}