public async void OnListViewItemTapped(object sender, ItemTappedEventArgs e)
{
Monkey tappedItem = e.Item as Monkey;
await Navigation.PushAsync(new ShowtheMonkey(tappedItem));
}
public void OnListViewItemSelected(object sender, SelectedItemChangedEventArgs e)
{
Monkey selectedItem = e.SelectedItem as Monkey;
}