private void AppBarButton_Click_1(object sender, RoutedEventArgs e)
{
mensa.prevDay();
displayItems(mensa.getCurrentList(), 0);
gui_title.Text = mensa.getHeaderText(true);
checkActions();
}
void loadPrevDay()
{
if (!_mensa.prevDay())
{
Android.Widget.Toast.MakeText(this, "Weitere Daten stehen nicht zur Verfügung!", Android.Widget.ToastLength.Short).Show();
}
listView.Adapter = new HomeScreenAdapter(this, _mensa.getCurrentList());
listView.InvalidateViews();
this.Title = _mensa.getHeaderText(true);
}
