[Android] Fix for CollectionView Scrolled event is triggered on the initial app load.

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

@@ -12,6 +12,7 @@ public class RecyclerViewScrollListener<TItemsView, TItemsViewSource> : Recycler
 		int _horizontalOffset, _verticalOffset;
 		TItemsView _itemsView;
 		readonly bool _getCenteredItemOnXAndY = false;
+		bool _hasCompletedFirstLayout = false;
 
 		public RecyclerViewScrollListener(TItemsView itemsView, ItemsViewAdapter<TItemsView, TItemsViewSource> itemsViewAdapter) : this(itemsView, itemsViewAdapter, false)
 		{
@@ -28,6 +29,8 @@ public RecyclerViewScrollListener(TItemsView itemsView, ItemsViewAdapter<TItemsV
 		internal void UpdateAdapter(ItemsViewAdapter<TItemsView, TItemsViewSource> itemsViewAdapter)
 		{
 			ItemsViewAdapter = itemsViewAdapter;
+			// Reset flag when adapter changes to handle ItemsSource updates
+			_hasCompletedFirstLayout = false;
 		}
 
 		public override void OnScrolled(RecyclerView recyclerView, int dx, int dy)
@@ -41,6 +44,17 @@ public override void OnScrolled(RecyclerView recyclerView, int dx, int dy)
 			_horizontalOffset += dx;
 			_verticalOffset += dy;
 
+			// Prevent the Scrolled event from firing on the very first layout callback only.
+			// This is the initial OnScrolled(0,0) call when the view is first laid out.
+			// After that, layout is marked as complete and all subsequent scroll events are allowed.
+			if (!_hasCompletedFirstLayout && !recyclerView.IsLaidOut && dx == 0 && dy == 0)
+			{
+				return;
+			}
+
+			// Mark that first layout has been processed - all future scrolls should fire events
+			_hasCompletedFirstLayout = true;
+
 			var (First, Center, Last) = GetVisibleItemsIndex(recyclerView);
 			var itemsViewScrolledEventArgs = new ItemsViewScrolledEventArgs
 			{

src/Controls/tests/TestCases.HostApp/Issues/Issue33333.cs

@@ -0,0 +1,65 @@
+using System.Collections.ObjectModel;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 33333, "CollectionView Scrolled event is triggered on the initial app load", PlatformAffected.Android)]
+public class Issue33333 : ContentPage
+{
+	int _scrolledEventCount = 0;
+
+	public Issue33333()
+	{
+		var items = new ObservableCollection<string>();
+		for (int i = 0; i < 50; i++)
+		{
+			items.Add($"Item {i}");
+		}
+
+		var scrollCountLabel = new Label
+		{
+			AutomationId = "ScrollCountLabel",
+			Text = "Scrolled Event Count: 0",
+			FontSize = 18,
+			Padding = new Thickness(10),
+			BackgroundColor = Colors.LightYellow
+		};
+
+		var collectionView = new CollectionView
+		{
+			AutomationId = "TestCollectionView",
+			ItemsSource = items,
+			ItemTemplate = new DataTemplate(() =>
+			{
+				var label = new Label
+				{
+					Padding = new Thickness(10),
+					VerticalOptions = LayoutOptions.Center
+				};
+				label.SetBinding(Label.TextProperty, ".");
+				return label;
+			})
+		};
+
+		collectionView.Scrolled += (sender, e) =>
+		{
+			_scrolledEventCount++;
+			scrollCountLabel.Text = $"Scrolled Event Count: {_scrolledEventCount}";
+		};
+
+		var instructionLabel = new Label
+		{
+			AutomationId = "InstructionLabel",
+			Text = "The Scrolled event count should remain 0 on initial load. On Android, it incorrectly fires immediately.",
+			Padding = new Thickness(10),
+			FontSize = 14,
+			TextColor = Colors.Gray
+		};
+
+		Content = new StackLayout
+		{
+			Children = { scrollCountLabel, instructionLabel, collectionView }
+		};
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue33333.cs

@@ -0,0 +1,23 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue33333 : _IssuesUITest
+{
+	public override string Issue => "CollectionView Scrolled event is triggered on the initial app load";
+
+	public Issue33333(TestDevice device) : base(device) { }
+
+	[Test]
+	[Category(UITestCategories.CollectionView)]
+	public void CollectionViewScrolledEventShouldNotFireOnInitialLoad()
+	{
+		App.WaitForElement("ScrollCountLabel");
+
+		var scrollCountText = App.FindElement("ScrollCountLabel").GetText();
+		Assert.That(scrollCountText, Is.EqualTo("Scrolled Event Count: 0"),
+			"Scrolled event should not fire on initial load without user interaction");
+	}
+}