MainPage.xaml.cs

using System.Collections.ObjectModel;

namespace ReproListViewHeaders;

public partial class MainPage : ContentPage
{
    public class Animal
    {
        public string Name { get; set; }
        public string Location { get; set; }
        public string Details { get; set; }
        public string ImageUrl { get; set; }
    }
    public class AnimalGroup : List<Animal>
    {
        public string Name { get; private set; }

        public AnimalGroup(string name, List<Animal> animals) : base(animals)
        {
            Name = name;
        }
    }

    public List<AnimalGroup> Animals { get; private set; } = new List<AnimalGroup>();
    public MainPage()
    {
        InitializeComponent();


        Animals.Add(new AnimalGroup("Bears", new List<Animal>
{
    new Animal
    {
        Name = "American Black Bear",
        Location = "North America",
        Details = "Details about the bear go here.",
        ImageUrl = "https://upload.wikimedia.org/wikipedia/commons/0/08/01_Schwarzbär.jpg"
    },
    new Animal
    {
        Name = "Asian Black Bear",
        Location = "Asia",
        Details = "Details about the bear go here.",
        ImageUrl = "https://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Ursus_thibetanus_3_%28Wroclaw_zoo%29.JPG/180px-Ursus_thibetanus_3_%28Wroclaw_zoo%29.JPG"
    },
    // ...
}));
        Animals.Add(new AnimalGroup("Monkeys", new List<Animal>
{
    new Animal
    {
        Name = "Baboon",
        Location = "Africa & Asia",
        Details = "Details about the monkey go here.",
        ImageUrl = "https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Papio_anubis_%28Serengeti%2C_2009%29.jpg/200px-Papio_anubis_%28Serengeti%2C_2009%29.jpg"
    },
    new Animal
    {
        Name = "Capuchin Monkey",
        Location = "Central & South America",
        Details = "Details about the monkey go here.",
        ImageUrl = "https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Capuchin_Costa_Rica.jpg/200px-Capuchin_Costa_Rica.jpg"
    },
    new Animal
    {
        Name = "Blue Monkey",
        Location = "Central and East Africa",
        Details = "Details about the monkey go here.",
        ImageUrl = "https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/BlueMonkey.jpg/220px-BlueMonkey.jpg"
    },
    // ...
}));


    }


    private async void MainListView_ItemTapped(object sender, ItemTappedEventArgs e)
    {
        Animal selectedItem = MainListView.SelectedItem as Animal;
        await DisplayAlert("Tapped Entry Data :", selectedItem.Name, "OK");
    }

    private void SwipeView_SwipeEnded(object sender, SwipeEndedEventArgs e)
    {

    }

    private void Button_Clicked(object sender, EventArgs e)
    {
        MainListView.ItemsSource = Animals;
    }

    private void Button_Clicked_1(object sender, EventArgs e)
    {
        MainListView.IsGroupingEnabled = true;
      
    }

    private void Button_Clicked_2(object sender, EventArgs e)
    {
        MainListView.IsGroupingEnabled = false;
    }
}