Mono for Android and BaseExpandableListAdapter example

Here, admittedly, is a crude but functional example of using a custom extensible list adapter. You can think of a data source as a list of lists, as each item will expand to display a list of items below it. To represent this, we will use this simple model:

public class Group : Java.Lang.Object
{
    public string Name { get; set; }
    public IList<string> Items { get; set; }
}

, , BaseExpandableListAdapter /:

public class MyAdapter : BaseExpandableListAdapter
{
    private readonly Context _context;
    private readonly IList<Group> _groups;

    public MyAdapter(Context context, IList<Group> groups)
    {
        _context = context;
        _groups = groups;
    }

    public override Java.Lang.Object GetChild(int groupPosition, int childPosition)
    {
        return _groups[groupPosition].Items[childPosition];
    }

    public override long GetChildId(int groupPosition, int childPosition)
    {
        return (groupPosition * _groups.Count) + childPosition;
    }

    public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
    {
        var view = (TextView)(convertView ?? new TextView(_context));

        view.Text = _groups[groupPosition].Items[childPosition];

        return view;
    }

    public override int GetChildrenCount(int groupPosition)
    {
        return _groups[groupPosition].Items.Count;
    }

    public override Java.Lang.Object GetGroup(int groupPosition)
    {
        return _groups[groupPosition];
    }

    public override long GetGroupId(int groupPosition)
    {
        return groupPosition;
    }

    public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
    {
        var view = (TextView)(convertView ?? new TextView(_context));

        view.Text = _groups[groupPosition].Name;

        return view;
    }

    public override bool IsChildSelectable(int groupPosition, int childPosition)
    {
        return true;
    }

    public override int GroupCount
    {
        get { return _groups.Count; }
    }

    public override bool HasStableIds
    {
        get { return true; }
    }
}

, , .. , TextView, / , .

, , :

[Activity(Label = "ExpandableListDemo", MainLauncher = true, Icon = "@drawable/icon")]
public class MyExpandableListActivity : ExpandableListActivity
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        var groups = new List<Group>
                         {
                             new Group
                                 {
                                     Name = "Group 1",
                                     Items = new List<string> { "Item 1.1", "Item 1.2", "Item 1.3" }
                                 },
                            new Group
                                 {
                                     Name = "Group 2",
                                     Items = new List<string> { "Item 2.1", "Item 2.2", "Item 2.3" }
                                 }
                         };

        var adapter = new MyAdapter(this, groups);

        SetListAdapter(adapter);
    }
}