protected override void OnCreate(Bundle savedInstanceState)
        {
            if (_appActivity is null)
            {
                // was called by derived class ...
                base.OnCreate(savedInstanceState);
            }

            if (!Authorization.IsAppDelegateRegistered)
            {
                Authorization.RegisterAppDelegate(() => this);
            }
            Current = this;
        }
 /// <summary>
 ///   Initializes the Android, enabling authorization.
 /// </summary>
 /// <param name="appActivity">
 ///   The calling (main) Activity.
 /// </param>
 /// <param name="savedInstanceState">
 ///   The Main Activity "context".
 /// </param>
 public static void OnCreate(FormsAppCompatActivity appActivity, Bundle savedInstanceState)
 {
     Current = new TetraPakMainActivity(appActivity, savedInstanceState);
     Current.OnCreate(savedInstanceState);
 }