private void PrepareListData()
{
listDataHeader = new List <ExpandedMenuModel>();
listDataChild = new Dictionary <ExpandedMenuModel, List <String> >();
ExpandedMenuModel item1 = new ExpandedMenuModel();
item1.Name = "heading1";
item1.Image = Resource.Drawable.abc_ic_menu_copy_mtrl_am_alpha;
// Adding data header
listDataHeader.Add(item1);
ExpandedMenuModel item2 = new ExpandedMenuModel();
item2.Name = "heading2";
item2.Image = Resource.Drawable.abc_ic_voice_search_api_material;
listDataHeader.Add(item2);
ExpandedMenuModel item3 = new ExpandedMenuModel();
item3.Name = "heading3";
item3.Image = Resource.Drawable.abc_ic_menu_share_mtrl_alpha;
listDataHeader.Add(item3);
ExpandedMenuModel item4 = new ExpandedMenuModel();
item4.Name = "heading4";
item4.Image = Resource.Drawable.abc_ic_menu_paste_mtrl_am_alpha;
listDataHeader.Add(item4);
// Adding child data
List <String> heading1 = new List <String>();
heading1.Add("Submenu of item 1");
List <String> heading2 = new List <String>();
heading2.Add("Submenu of item 2");
heading2.Add("Submenu of item 2");
heading2.Add("Submenu of item 2");
List <String> heading3 = new List <String>();
heading3.Add("Submenu of item 3");
heading3.Add("Submenu of item 3");
List <String> heading4 = new List <String>();
heading4.Add("Submenu of item 4");
heading4.Add("Submenu of item 4");
listDataChild.Add(listDataHeader[0], heading1); // Header, Child data
listDataChild.Add(listDataHeader[1], heading2);
listDataChild.Add(listDataHeader[2], heading3);
listDataChild.Add(listDataHeader[3], heading4);
}
public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
{
ExpandedMenuModel headerTitle = _listDataHeader[groupPosition];
convertView = convertView ?? _context.LayoutInflater.Inflate(Resource.Layout.list_header, null);
TextView lblListHeader = (TextView)convertView.FindViewById(Resource.Id.submenu);
ImageView headerIcon = (ImageView)convertView.FindViewById(Resource.Id.iconimage);
lblListHeader.Text = headerTitle.Name;
headerIcon.SetImageResource(headerTitle.Image);
return(convertView);
}