public void SelecteItem_Handle(object sender, SelectedItemChangedEventArgs args)
        {
            activitiesList.SelectedItem = null;
            NPActivity activity = args.SelectedItem as NPActivity;

            if (activity != null)
            {
                Navigation.PushAsync(new NPUserProfilePage(activity));
            }
        }
 public NPUserProfilePage(NPActivity activity)
 {
     InitializeComponent();
     BindingContext = activity;
 }