Fix Incorrect Scrolling Behavior in CollectionView ScrollTo Method Using Index Value

src/Controls/src/Core/Handlers/Items/Android/MauiRecyclerView.cs

@@ -390,6 +390,13 @@ public virtual void ScrollTo(ScrollToRequestEventArgs args)
 
 			var position = DetermineTargetPosition(args);
 
+			// The collection view includes a header at the zeroth index, so the collection view scrolling is not correct using the index.
+			bool hasHeader = ItemsViewAdapter.ItemsSource.HasHeader;
+			if (hasHeader)
+			{
+				position += 1;
+			}
+
 			if (args.IsAnimated)
 			{
 				ScrollHelper.AnimateScrollToPosition(position, args.ScrollToPosition);

src/Controls/tests/TestCases.HostApp/Issues/Issue27117.xaml

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue27117"
+             xmlns:cv2="clr-namespace:Maui.Controls.Sample"
+             xmlns:local="clr-namespace:Maui.Controls.Sample.Issues">
+
+    <ContentPage.BindingContext>
+        <local:_27117MainViewModel/>
+    </ContentPage.BindingContext>
+
+    <Grid RowDefinitions="Auto,*">
+        <Button Grid.Row="0" 
+                Text="Scroll to First Item" 
+                AutomationId="ScrollToFirstItemButton"
+                Clicked="ScrollToFirstItem_Clicked"/>
+
+        <cv2:CollectionView2 Grid.Row="1"
+                             AutomationId="collectionView"
+                             x:Name="collectionView"
+                             x:DataType="local:_27117MainViewModel"
+                             ItemsSource="{Binding _27117People}"
+                             BackgroundColor="DarkGray">
+            <cv2:CollectionView2.Header>
+                <StackLayout BackgroundColor="LightGray">
+                    <Label Margin="10,0,0,0"
+                           Text="People"
+                           AutomationId="HeaderLabel"
+                           FontSize="Header"
+                           FontAttributes="Bold"/>
+                </StackLayout>
+            </cv2:CollectionView2.Header>
+
+            <cv2:CollectionView2.ItemTemplate>
+                <DataTemplate x:DataType="local:_27117Person">
+                    <VerticalStackLayout>
+                        <Label Text="{Binding Name}"
+                               AutomationId="{Binding Name}"
+                               FontSize="Medium"/>
+                        <Rectangle HeightRequest="2"
+                                   BackgroundColor="Black"/>
+                    </VerticalStackLayout>
+                </DataTemplate>
+            </cv2:CollectionView2.ItemTemplate>
+
+            <cv2:CollectionView2.Footer>
+                <StackLayout BackgroundColor="LightGray">
+                    <Label Margin="10,0,0,0"
+                           Text="Footer"
+                           FontSize="Header"
+                           FontAttributes="Bold"/>
+                </StackLayout>
+            </cv2:CollectionView2.Footer>
+        </cv2:CollectionView2>
+    </Grid>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue27117.xaml.cs

@@ -0,0 +1,43 @@
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using System.Windows.Input;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 27117, "CollectionView ScrollTo not working under android", PlatformAffected.All)]
+	public partial class Issue27117 : ContentPage
+	{
+		public Issue27117()
+		{
+			InitializeComponent();
+		}
+
+		private void ScrollToFirstItem_Clicked(object sender, EventArgs e)
+		{
+			collectionView.ScrollTo(0, position: ScrollToPosition.Start, animate: false);
+		}
+	}
+
+	public class _27117MainViewModel : BindableObject
+	{
+		public ObservableCollection<_27117Person> _27117People { get; set; }
+		public _27117MainViewModel()
+		{
+			_27117People = new ObservableCollection<_27117Person>();
+			for (int i = 0; i < 100; i++)
+			{
+				_27117People.Add(new _27117Person($"Person {i}"));
+			}
+		}
+	}
+
+	public class _27117Person
+	{
+		public string Name { get; set; }
+
+		public _27117Person(string name)
+		{
+			Name = name;
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue27117.cs

@@ -0,0 +1,48 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue27117 : _IssuesUITest
+	{
+		public Issue27117(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "CollectionView ScrollTo not working under android";
+
+		[Test]
+		[Category(UITestCategories.CollectionView)]
+		public void ScrollToIndexZeroShowsFirstItemNotHeader()
+		{
+			// Wait for CollectionView to load
+			App.WaitForElement("collectionView");
+
+			// Get Y position of header
+			var headerRect = App.WaitForElement("HeaderLabel").GetRect();
+			var headerY = headerRect.Y;
+
+			// Get initial Y position of "Person 0" 
+			var initialRect = App.WaitForElement("Person 0").GetRect();
+			var initialY = initialRect.Y;
+
+			// Person 0 should be below the header initially
+			Assert.That(initialY, Is.GreaterThan(headerY),
+				"Person 0 should be below header initially");
+
+			// Tap button to scroll to index 0 with ScrollToPosition.Start
+			App.Tap("ScrollToFirstItemButton");
+			Task.Delay(1000).Wait();
+
+			// Get Y position after ScrollTo(0)
+			var afterScrollToRect = App.WaitForElement("Person 0").GetRect();
+			var afterScrollToY = afterScrollToRect.Y;
+
+			Assert.That(afterScrollToY, Is.LessThan(initialY),
+				$"ScrollTo(0) should scroll Person 0 to top, not push it down. " +
+				$"Initial Y={initialY}, After ScrollTo Y={afterScrollToY}. " +
+				$"If Y increased, the header was incorrectly treated as index 0.");
+		}
+	}
+}