Fixed - Grouped CollectionView items not rendered properly on Android, works on Windows

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

@@ -104,15 +104,16 @@ public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int positi
 
 		protected override void BindTemplatedItemViewHolder(TemplatedItemViewHolder templatedItemViewHolder, object context)
 		{
-			if (ItemsView.ItemSizingStrategy == ItemSizingStrategy.MeasureFirstItem)
-			{
-				templatedItemViewHolder.Bind(context, ItemsView, _reportMeasure, _size);
-
-				if (templatedItemViewHolder.ItemView is ItemContentView itemContentView)
-				{
-					itemContentView.RetrieveStaticSize = _retrieveStaticSize;
+			var itemViewType = templatedItemViewHolder.ItemViewType;
+			if (ItemsView.ItemSizingStrategy == ItemSizingStrategy.MeasureFirstItem && itemViewType != ItemViewType.Header && itemViewType != ItemViewType.Footer && itemViewType != ItemViewType.GroupHeader && itemViewType != ItemViewType.GroupFooter)
+ 			{
+ 				templatedItemViewHolder.Bind(context, ItemsView, _reportMeasure, _size);
+
+ 				if (templatedItemViewHolder.ItemView is ItemContentView itemContentView)
+ 				{
+ 					itemContentView.RetrieveStaticSize = _retrieveStaticSize;
 				}
-			}
+ 			}
 			else
 			{
 				base.BindTemplatedItemViewHolder(templatedItemViewHolder, context);

src/Controls/tests/TestCases.HostApp/Issues/Issue20855.cs

@@ -0,0 +1,86 @@
+using System.Collections.ObjectModel;
+using Microsoft.Maui.Layouts;
+
+namespace Maui.Controls.Sample.Issues
+{
+
+    [Issue(IssueTracker.Github, 20855, "Grouped CollectionView items not rendered properly on Android, works on Windows", PlatformAffected.Android)]
+    public class Issue20855 : TestContentPage
+    {
+
+        protected override void Init()
+        {
+            ObservableCollection<Issue20855ItemGroup> ItemGroups = new ObservableCollection<Issue20855ItemGroup>();
+            var group1 = new Issue20855ItemGroup { Name = "Group 1" };
+            group1.Add(new Issue20855Item { Name = "Item 1", CreateDate = new DateTime(2025, 2, 20) });
+            group1.Add(new Issue20855Item { Name = "Item 2", CreateDate = new DateTime(2025, 2, 19) });
+            ItemGroups.Add(group1);
+            var group2 = new Issue20855ItemGroup { Name = "Group 2" };
+            group2.Add(new Issue20855Item { Name = "Item 3", CreateDate = new DateTime(2025, 2, 18) });
+            group2.Add(new Issue20855Item { Name = "Item 4", CreateDate = new DateTime(2025, 2, 17) });
+            ItemGroups.Add(group2);
+
+            var collectionView = new CollectionView
+            {
+                ItemsSource = ItemGroups,
+                IsGrouped = true,
+                ItemSizingStrategy = ItemSizingStrategy.MeasureFirstItem
+            };
+            collectionView.GroupHeaderTemplate = new DataTemplate(() =>
+            {
+                var label = new Label
+                {
+                    FontSize = 18,
+                    BackgroundColor = Colors.DarkGray,
+                    TextColor = Colors.White,
+                    Padding = new Thickness(10, 0)
+                };
+                label.SetBinding(Label.TextProperty, "Name");
+
+                return label;
+            });
+            collectionView.ItemTemplate = new DataTemplate(() =>
+            {
+                var flexLayout = new FlexLayout
+                {
+                    JustifyContent = FlexJustify.SpaceBetween,
+                    AlignItems = FlexAlignItems.Center,
+                    HeightRequest = 100
+                };
+
+                var nameLabel = new Label
+                {
+                    Padding = new Thickness(8, 0),
+                    HeightRequest = 80
+                };
+                nameLabel.SetBinding(Label.TextProperty, "Name");
+
+                var dateLabel = new Label
+                {
+                    Padding = new Thickness(8, 0),
+                    HeightRequest = 85
+                };
+                dateLabel.SetBinding(Label.TextProperty, new Binding("CreateDate", stringFormat: "{0:MMM d}"));
+
+                flexLayout.Children.Add(nameLabel);
+                flexLayout.Children.Add(dateLabel);
+
+                return flexLayout;
+            });
+            var grid = new Grid();
+            grid.Children.Add(collectionView);
+            Content = grid;
+        }
+    }
+
+    public class Issue20855Item
+    {
+        public string Name { get; set; }
+        public DateTime CreateDate { get; set; }
+    }
+
+    public class Issue20855ItemGroup : ObservableCollection<Issue20855Item>
+    {
+        public string Name { get; set; }
+    }
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue20855.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue20855 : _IssuesUITest
+	{
+
+		public Issue20855(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Grouped CollectionView items not rendered properly on Android, works on Windows";
+
+		[Test]
+		[Category(UITestCategories.CollectionView)]
+		public void GroupedCollectionViewItems()
+		{
+			App.WaitForElement("Item 1");
+			VerifyScreenshot("GroupedCollectionViewItems");
+		}
+	}
+}