ListView not unselecting

Question

I am working on a Xamarin.Forms project with a ListView.

The XAML for the ListView is

Answer 1

To apply background color to list view selected item follow these steps:

Make custom control:

using Xamarin.Forms;

namespace xamformsdemo.CustomControls
{
  public class ExtendedViewCell : ViewCell
  {
    public static readonly BindableProperty SelectedBackgroundColorProperty =
    BindableProperty.Create("SelectedBackgroundColor", 
                            typeof(Color), 
                            typeof(ExtendedViewCell), 
                            Color.Default);

    public Color SelectedBackgroundColor
    {
       get { return (Color)GetValue(SelectedBackgroundColorProperty); }
       set { SetValue(SelectedBackgroundColorProperty, value); }
    }
  }
}

Android Renderer:

[assembly: ExportRenderer(typeof(ExtendedViewCell), typeof(ExtendedViewCellRenderer))]
namespace xamformsdemo.Droid.CustomRenderers
{
  public class ExtendedViewCellRenderer : ViewCellRenderer
  {

private Android.Views.View _cellCore;
private Drawable _unselectedBackground;
private bool _selected;

protected override Android.Views.View GetCellCore(Cell item, 
                                                  Android.Views.View convertView, 
                                                  ViewGroup parent, 
                                                  Context context)
{
  _cellCore = base.GetCellCore(item, convertView, parent, context);

  _selected = false;
  _unselectedBackground = _cellCore.Background;

  return _cellCore;
}

protected override void OnCellPropertyChanged(object sender, PropertyChangedEventArgs args)
{
  base.OnCellPropertyChanged(sender, args);

  if (args.PropertyName == "IsSelected")
  {
    _selected = !_selected;

    if (_selected)
    {
      var extendedViewCell = sender as ExtendedViewCell;
      _cellCore.SetBackgroundColor(extendedViewCell.SelectedBackgroundColor.ToAndroid());
    }
    else
    {
      _cellCore.SetBackground(_unselectedBackground);
    }
  }
}
  }

}

iOS Renderer:

[assembly: ExportRenderer(typeof(ExtendedViewCell), typeof(ExtendedViewCellRenderer))]
namespace xamformsdemo.iOS.CustomRenderers
{
  public class ExtendedViewCellRenderer : ViewCellRenderer
  {
    public override UITableViewCell GetCell(Cell item, UITableViewCell reusableCell, UITableView tv)
   {
      var cell = base.GetCell(item, reusableCell, tv);
      var view = item as ExtendedViewCell;
      cell.SelectedBackgroundView = new UIView
       {
         BackgroundColor = view.SelectedBackgroundColor.ToUIColor(),
       };

      return cell;
    }

  }
}

Use in XAML:

You can refer this link below to solve problem: https://blog.wislon.io/posts/2017/04/11/xamforms-listview-selected-colour