Fix Android crash when setting Entry.Text in TextChanged event handler

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

@@ -0,0 +1,42 @@
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 32000, "Entry crash when setting Text in TextChanged event handler on Android", PlatformAffected.Android)]
+	public class IssueEntryTextChangedCrash : TestContentPage
+	{
+		private const string entryId = "TestEntry";
+		private const string labelId = "TestLabel";
+
+		protected override void Init()
+		{
+			var label = new Label
+			{
+				Text = "Delete the text in the Entry below. The app should not crash.",
+				AutomationId = labelId
+			};
+
+			var entry = new Entry
+			{
+				Text = "0",
+				Keyboard = Keyboard.Numeric,
+				AutomationId = entryId
+			};
+
+			entry.TextChanged += OnEntryTextChanged;
+
+			Content = new VerticalStackLayout
+			{
+				Padding = 20,
+				Spacing = 10,
+				Children = { label, entry }
+			};
+		}
+
+		void OnEntryTextChanged(object sender, TextChangedEventArgs e)
+		{
+			if (string.IsNullOrEmpty(e.NewTextValue))
+			{
+				((Entry)sender).Text = "0";
+			}
+		}
+	}
+}

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

@@ -0,0 +1,34 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class IssueEntryTextChangedCrash : _IssuesUITest
+	{
+		const string EntryId = "TestEntry";
+
+		public IssueEntryTextChangedCrash(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Entry crash when setting Text in TextChanged event handler on Android";
+
+		[Test]
+		[Category(UITestCategories.Entry)]
+		public void EntryTextChangedShouldNotCrash()
+		{
+			App.WaitForElement(EntryId);
+
+			// Clear the entry text - this should trigger TextChanged which sets text to "0"
+			// The fix ensures this doesn't crash due to EmojiCompat bounds check
+			App.ClearText(EntryId);
+
+			// Verify the entry contains "0" after TextChanged handling
+			var entryText = App.FindElement(EntryId).GetText();
+			Assert.That(entryText, Is.EqualTo("0"), "Entry should contain '0' after clearing");
+
+			// Test should complete without crashing
+		}
+	}
+}

src/Core/src/Platform/Android/EditTextExtensions.cs

@@ -25,15 +25,23 @@ public static void UpdateText(this EditText editText, IEntry entry)
 			// User Types => VirtualView Updated => Triggers Native Update
 			// Then it will cause the cursor to reset to position zero as the user typed
 			editText.Text = entry.Text;
-			editText.SetSelection(editText.Text?.Length ?? 0);
+
+			// Ensure the selection position doesn't exceed the actual text length
+			// to prevent crashes when text is modified by text watchers (e.g., EmojiCompat)
+			int selectionPosition = Math.Min(editText.Text?.Length ?? 0, editText.Length());
+			editText.SetSelection(selectionPosition);
 
 			// TODO ezhart The renderer sets the text to selected and shows the keyboard if the EditText is focused
 		}
 
 		public static void UpdateText(this EditText editText, IEditor editor)
 		{
 			editText.Text = editor.Text;
-			editText.SetSelection(editText.Text?.Length ?? 0);
+
+			// Ensure the selection position doesn't exceed the actual text length
+			// to prevent crashes when text is modified by text watchers (e.g., EmojiCompat)
+			int selectionPosition = Math.Min(editText.Text?.Length ?? 0, editText.Length());
+			editText.SetSelection(selectionPosition);
 		}
 
 		public static void UpdateTextColor(this EditText editText, ITextStyle entry)
@@ -358,7 +366,9 @@ internal static void SetInputType(this EditText editText, ITextInput textInput)
 
 			// If we implement the OnSelectionChanged method, this method is called after a keyboard layout change with SelectionStart = 0,
 			// Let's restore the cursor position to its previous location.
-			editText.SetSelection(previousCursorPosition);
+			// Ensure the selection position doesn't exceed the actual text length
+			int selectionPosition = Math.Min(previousCursorPosition, editText.Length());
+			editText.SetSelection(selectionPosition);
 		}
 
 		internal static bool IsCompletedAction(this EditorActionEventArgs e, ImeAction currentInputImeFlag)