[Android] CollectionView: Fix SelectedItem visual state not applying when re-selecting same item

src/Controls/src/Core/Handlers/Items/Android/Adapters/SelectableItemsViewAdapter.cs

@@ -163,9 +163,16 @@ bool PositionIsSelected(int position)
 		void SelectableClicked(object sender, int adapterPosition)
 		{
 			if (adapterPosition >= 0 && adapterPosition < ItemsSource?.Count)
-			{
-				UpdateMauiSelection(adapterPosition);
-			}
+    		{
+        		UpdateMauiSelection(adapterPosition);
+        		// Unconditionally sync visual state for Single mode.
+        		// Handles value-equal items where PropertyChanged is suppressed.
+        		if (ItemsView.SelectionMode == SelectionMode.Single && sender is SelectableViewHolder clickedHolder)
+        		{
+            		ClearPlatformSelection();
+            		clickedHolder.IsSelected = true;
+        		}
+    		}
 		}
 
 		void UpdateMauiSelection(int adapterPosition)

src/Controls/tests/TestCases.HostApp/Issues/Issue20062.cs

@@ -0,0 +1,101 @@
+using Microsoft.Maui.Controls.Shapes;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 20062, "CollectionView - SelectedItem visual state manager not working",
+	PlatformAffected.Android)]
+public class Issue20062 : TestContentPage
+{
+	CollectionView _collectionView;
+	List<string> list = new List<string>();
+
+	protected override void Init()
+	{
+
+		_collectionView = new CollectionView
+		{
+			SelectionMode = SelectionMode.Single,
+			ItemsLayout = new GridItemsLayout(2, ItemsLayoutOrientation.Vertical)
+			{
+				HorizontalItemSpacing = 12,
+				VerticalItemSpacing = 12
+			},
+			ItemTemplate = new DataTemplate(() =>
+			{
+				var border = new Border
+				{
+					Padding = 4,
+					BackgroundColor = Colors.White,
+					Stroke = Colors.Gray,
+					StrokeShape = new RoundRectangle { CornerRadius = 12 },
+					StrokeThickness = 1
+				};
+
+				var label = new Label
+				{
+					FontFamily = "SemiBold",
+					TextColor = Colors.Black,
+					Text = "a",
+					FontSize = 14,
+					HorizontalOptions = LayoutOptions.Center,
+					HorizontalTextAlignment = TextAlignment.Center,
+					VerticalOptions = LayoutOptions.Center
+				};
+				var grid = new Grid
+				{
+					RowDefinitions =
+					{
+						new RowDefinition { Height = new GridLength(80) },
+						new RowDefinition { Height = new GridLength(40) }
+					}
+				};
+
+				grid.Add(label, 0, 1);
+
+				border.Content = grid;
+				VisualStateManager.SetVisualStateGroups(border, new VisualStateGroupList
+				{
+					new VisualStateGroup
+					{
+						Name = "CommonStates",
+						States =
+						{
+							new VisualState { Name = "Normal" },
+							new VisualState
+							{
+								Name = "Selected",
+								Setters =
+								{
+									new Setter { Property = Border.BackgroundColorProperty, Value = Colors.Blue },
+									new Setter { Property = Border.StrokeProperty, Value = Colors.Red }
+								}
+							}
+						}
+					}
+				});
+
+				return border;
+			})
+		};
+		_collectionView.AutomationId = "CollectionView";
+
+		var layout = new VerticalStackLayout
+		{
+			Padding = new Thickness(30, 0),
+			Spacing = 25,
+			Children = { _collectionView }
+		};
+		list.Add("a");
+		list.Add("a");
+		list.Add("a");
+		list.Add("a");
+		_collectionView.ItemsSource = list;
+
+		Content = new ScrollView
+		{
+			Content = layout
+		};
+
+	}
+}
+

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue20062.cs

@@ -0,0 +1,25 @@
+#if TEST_FAILS_ON_WINDOWS // When selecting a single item, the selection background is applied to all items.
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue20062 : _IssuesUITest
+{
+	public Issue20062(TestDevice device) : base(device) { }
+
+	public override string Issue => "CollectionView - SelectedItem visual state manager not working";
+
+	[Test]
+	[Category(UITestCategories.CollectionView)]
+	public void CollectionViewSelectionChangesVisualState()
+	{
+		App.WaitForElement("CollectionView");
+		var items = App.FindElementsByText("a");
+		items.ElementAt(0).Tap();
+		items.ElementAt(2).Tap();
+		VerifyScreenshot();
+	}
+}
+#endif