[Android] Fix for Label WordWrap width issue causing HorizontalOptions misalignment

src/Controls/tests/TestCases.HostApp/Issues/Issue31782.cs

@@ -0,0 +1,34 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 31782, "Unexpected Line Breaks in Android, Label with WordWrap Mode Due to Trailing Space", PlatformAffected.Android)]
+public class Issue31782 : ContentPage
+{
+	public Issue31782()
+	{
+		var layout = new VerticalStackLayout { Spacing = 20, Padding = 20 };
+
+		var container = new Grid
+		{
+			AutomationId = "Container",
+			WidthRequest = 300,
+			HorizontalOptions = LayoutOptions.Center,
+			BackgroundColor = Colors.LightBlue
+		};
+
+		var label = new Label
+		{
+			AutomationId = "TestLabel",
+			Text = "How does .NET MAUI handle mauinavigaton?",
+			LineBreakMode = LineBreakMode.WordWrap,
+			TextColor = Color.FromArgb("#212121"),
+			FontSize = 20,
+			HorizontalOptions = LayoutOptions.End,
+			BackgroundColor = Colors.LightGreen
+		};
+
+		container.Add(label);
+		layout.Add(container);
+
+		Content = layout;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue31782.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue31782 : _IssuesUITest
+{
+	public Issue31782(TestDevice device) : base(device) { }
+
+	public override string Issue => "Unexpected Line Breaks in Android, Label with WordWrap Mode Due to Trailing Space";
+
+	[Test]
+	[Category(UITestCategories.Label)]
+	public void LabelWithEndAlignmentShouldNotHaveTrailingSpace()
+	{
+		var labelRect = App.WaitForElement("TestLabel").GetRect();
+		var containerRect = App.WaitForElement("Container").GetRect();
+
+		// Before fix: Label width ≈ container width (300pt with trailing space)
+		// After fix: Label width < container width (measures only longest line)
+		Assert.That(labelRect.Width, Is.LessThan(containerRect.Width - 10),
+			$"End-aligned label ({labelRect.Width}pt) should be narrower than container ({containerRect.Width}pt)");
+	}
+}

src/Core/src/Handlers/Label/LabelHandler.Android.cs

@@ -1,3 +1,4 @@
+using Android.Text;
 using Android.Views;
 using AndroidX.AppCompat.Widget;
 using Microsoft.Maui.Graphics;
@@ -15,6 +16,35 @@ public override void PlatformArrange(Rect frame)
 			base.PlatformArrange(frame);
 		}
 
+		public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
+		{
+			var size = base.GetDesiredSize(widthConstraint, heightConstraint);
+
+			// Android TextView reports full available width instead of actual text width when
+			// text wraps to multiple lines, causing incorrect positioning for non-Fill alignments.
+			if (VirtualView.HorizontalLayoutAlignment != Primitives.LayoutAlignment.Fill &&
+				PlatformView?.Layout is Layout layout &&
+				layout.LineCount > 1)
+			{
+				float maxLineWidth = 0;
+				for (int i = 0; i < layout.LineCount; i++)
+				{
+					float lineWidth = layout.GetLineWidth(i);
+					if (lineWidth > maxLineWidth)
+						maxLineWidth = lineWidth;
+				}
+
+				if (maxLineWidth > 0)
+				{
+					var actualWidth = Context.FromPixels(maxLineWidth + PlatformView.PaddingLeft + PlatformView.PaddingRight);
+					if (actualWidth < size.Width)
+						return new Size(actualWidth, size.Height);
+				}
+			}
+
+			return size;
+		}
+
 		internal static void MapBackground(ILabelHandler handler, ILabel label)
 		{
 			handler.PlatformView?.UpdateBackground(label);

src/Core/src/PublicAPI/net-android/PublicAPI.Unshipped.txt

@@ -1 +1,2 @@
 #nullable enable
+override Microsoft.Maui.Handlers.LabelHandler.GetDesiredSize(double widthConstraint, double heightConstraint) -> Microsoft.Maui.Graphics.Size