[Android] Fix for BlazorWebView predictive back callback blocks Android back-to-home animation - #35538
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…ks the predictive back-to-home animation on Android.
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/review -b feature/regression-check -p android |
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May 20, 2026
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🤖 Automated review — alternative fix proposed
The expert-reviewer evaluation compared the PR fix against #1 automatically generated candidates and selected try-fix-1 as the strongest fix.
Why: try-fix-1 (Candidate A) is the only candidate whose architecture gives the AOSP-contract predictive back-to-home animation guarantee on Android 16 (no callback registered when there is no back history) while staying closest to the last shipping 10.0.10 behavior. It keeps IOnBackInvokedCallback on API 33+, preserves OnKeyDown for pre-Q hardware-back, anchors the dispatcher lookup to the WebView's owning activity (eliminating the Platform.CurrentActivity multi-window bug), and drops the unrelated IBackNavigationState accessibility change. pr-plus-reviewer / try-fix-2 still rely on Enabled=false (residual OEM-ROM risk); try-fix-3 has the same guarantee as A but with a larger architectural delta; pr ships the activity-owner bug, broken self-disable, and removes pre-Q OnKeyDown.
Please consider applying the candidate diff below (or use it as guidance). Once you push an update, this workflow will re-trigger and re-evaluate.
Candidate diff (`try-fix-1`)
diff --git a/src/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cs b/src/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cs
--- a/src/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cs
+++ b/src/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cs
@@ -7,8 +7,6 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
/// </summary>
internal class BlazorAndroidWebView : AWebView
{
-internal bool BackNavigationHandled { get; set; }
-
/// <summary>
/// Initializes a new instance of <see cref="BlazorAndroidWebView"/>
/// </summary>
@@ -19,12 +17,11 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
public override bool OnKeyDown(Keycode keyCode, KeyEvent? e)
{
+// Pre-Q hardware-back fallback. On API 33+ this is superseded by IOnBackInvokedCallback
+// (registered dynamically in BlazorWebViewHandler.UpdateBackNavigationState).
if (keyCode == Keycode.Back && CanGoBack() && e?.RepeatCount == 0)
{
GoBack();
-BackNavigationHandled = true;
return true;
}
-BackNavigationHandled = false;
return false;
}
diff --git a/src/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cs b/src/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cs
--- a/src/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cs
+++ b/src/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cs
@@ -1,16 +1,16 @@
using System;
+using System.Runtime.Versioning;
using System.Threading.Tasks;
+using Android.Content;
using Android.Window;
using Android.Webkit;
using Android.Widget;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Maui;
using Microsoft.Maui.Dispatching;
using Microsoft.Maui.Handlers;
-using Microsoft.Maui.LifecycleEvents;
using static global::Android.Views.ViewGroup;
using AWebView = global::Android.Webkit.WebView;
using Path = System.IO.Path;
@@ -22,28 +22,12 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
private WebViewClient? _webViewClient;
private WebChromeClient? _webChromeClient;
private AndroidWebKitWebViewManager? _webviewManager;
internal AndroidWebKitWebViewManager? WebviewManager => _webviewManager;
-private AndroidLifecycle.OnBackPressed? _onBackPressedHandler;
-BlazorWebViewPredictiveBackCallback? _predictiveBackCallback;
+private BlazorOnBackInvokedCallback? _onBackInvokedCallback;
+private bool _backCallbackRegistered;
private ILogger? _logger;
internal ILogger Logger => _logger ??= Services!.GetService<ILogger<BlazorWebViewHandler>>() ?? NullLogger<BlazorWebViewHandler>.Instance;
-/// <summary>
-/// Gets the concrete LifecycleEventService to access internal RemoveEvent method.
-/// RemoveEvent is internal because it's not part of the public ILifecycleEventService contract,
-/// but is needed for proper cleanup of lifecycle event handlers.
-/// </summary>
-private LifecycleEventService? TryGetLifecycleEventService()
-{
-var services = MauiContext?.Services;
-if (services != null)
-{
-return services.GetService<ILifecycleEventService>() as LifecycleEventService;
-}
-return null;
-}
-
protected override AWebView CreatePlatformView()
{
Logger.CreatingAndroidWebkitWebView();
@@ -82,67 +66,29 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
/// <summary>
/// Connects the handler to the Android <see cref="AWebView"/>. Back-navigation
-/// handling is wired lazily: an <see cref="IOnBackInvokedCallback"/> is registered
-/// only while <see cref="AWebView.CanGoBack"/> returns <c>true</c> (Android 13+),
-/// so the system plays the predictive back-to-home animation when the WebView
+/// handling is wired lazily — an <see cref="IOnBackInvokedCallback"/> is registered
+/// only while <see cref="AWebView.CanGoBack"/> returns <c>true</c> (Android 13+).
+/// When no callback is registered the system plays the predictive back-to-home animation when the WebView
/// has no history. Pre-API-33 hardware back is handled by
/// <see cref="BlazorAndroidWebView.OnKeyDown"/>.
/// </summary>
protected override void ConnectHandler(AWebView platformView)
{
base.ConnectHandler(platformView);
-
-// Register OnBackPressed lifecycle event handler to check WebView's back navigation
-// This ensures predictive back gesture (Android 13+) checks WebView.CanGoBack() before popping page
-var lifecycleService = TryGetLifecycleEventService();
-if (lifecycleService != null)
-{
-// Create a weak reference to avoid memory leaks
-var weakPlatformView = new WeakReference<AWebView>(platformView);
-
-AndroidLifecycle.OnBackPressed handler = (activity) =>
-{
-// Check if WebView is still alive, attached to window, and has focus
-// This prevents non-visible or unfocused BlazorWebView instances from
-// incorrectly intercepting back navigation when multiple instances exist
-if (weakPlatformView.TryGetTarget(out var webView) &&
-webView.IsAttachedToWindow &&
-webView.HasWindowFocus &&
-webView.CanGoBack())
-{
-webView.GoBack();
-return true; // Prevent back propagation - handled by WebView
-}
-
-return false; // Allow back propagation - let page be popped
-};
-
-// Register with lifecycle service - will be invoked by HandleBackNavigation in MauiAppCompatActivity
-lifecycleService.AddEvent(nameof(AndroidLifecycle.OnBackPressed), handler);
-_onBackPressedHandler = handler;
-}
-
-if (OperatingSystem.IsAndroidVersionAtLeast(33) && _predictiveBackCallback is null)
-{
-if (Microsoft.Maui.ApplicationModel.Platform.CurrentActivity is not null)
-{
-_predictiveBackCallback = new BlazorWebViewPredictiveBackCallback(this);
-Microsoft.Maui.ApplicationModel.Platform.CurrentActivity?.OnBackInvokedDispatcher?.RegisterOnBackInvokedCallback(0, _predictiveBackCallback);
-}
-}
+// IOnBackInvokedCallback (33+) is registered lazily by UpdateBackNavigationState()
+// the first time CanGoBack() flips true; on API <=32 OnKeyDown on the WebView
+// covers hardware back.
}
private const string AndroidFireAndForgetAsyncSwitch = "BlazorWebView.AndroidFireAndForgetAsync";
protected override void DisconnectHandler(AWebView platformView)
{
-if (OperatingSystem.IsAndroidVersionAtLeast(33) && _predictiveBackCallback is not null)
+if (OperatingSystem.IsAndroidVersionAtLeast(33))
{
-Microsoft.Maui.ApplicationModel.Platform.CurrentActivity?.OnBackInvokedDispatcher?.UnregisterOnBackInvokedCallback(_predictiveBackCallback);
-_predictiveBackCallback.Dispose();
-_predictiveBackCallback = null;
+UnregisterBackInvokedCallback(platformView);
+_onBackInvokedCallback?.Dispose();
+_onBackInvokedCallback = null;
}
-
-// Clean up lifecycle event handler to prevent memory leaks
-if (_onBackPressedHandler != null)
-{
-var lifecycleService = TryGetLifecycleEventService();
-if (lifecycleService != null)
-{
-lifecycleService.RemoveEvent(nameof(AndroidLifecycle.OnBackPressed), _onBackPressedHandler);
-_onBackPressedHandler = null;
-}
-}
platformView.StopLoading();
@@ -281,41 +227,80 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
return await _webviewManager.TryDispatchAsync(workItem);
}
-sealed class BlazorWebViewPredictiveBackCallback : Java.Lang.Object, IOnBackInvokedCallback
+/// <summary>
+/// Toggles registration of the IOnBackInvokedCallback based on the WebView's
+/// current ability to navigate back. Called from <c>WebKitWebViewClient.OnPageFinished</c>
+/// and <c>DoUpdateVisitedHistory</c>. The defining invariant is: a callback is registered
+/// iff <c>CanGoBack() && IsAttachedToWindow</c>. When unregistered, Android plays
+/// the predictive back-to-home animation per the AOSP contract.
+/// </summary>
+internal void UpdateBackNavigationState()
{
-WeakReference<BlazorWebViewHandler> _weakBlazorWebViewHandler;
+var pv = PlatformView;
+if (pv is null)
+return;
+
+if (!OperatingSystem.IsAndroidVersionAtLeast(33))
+return; // Pre-Q hardware back is covered by BlazorAndroidWebView.OnKeyDown.
+
+if (pv.CanGoBack() && pv.IsAttachedToWindow)
+RegisterBackInvokedCallback(pv);
+else
+UnregisterBackInvokedCallback(pv);
+}
+
+[SupportedOSPlatform("android33.0")]
+private void RegisterBackInvokedCallback(AWebView pv)
+{
+if (_backCallbackRegistered)
+return;
+
+var dispatcher = ResolveOwningActivity(pv.Context)?.OnBackInvokedDispatcher;
+if (dispatcher is null)
+return;
+
+_onBackInvokedCallback ??= new BlazorOnBackInvokedCallback(new WeakReference<AWebView>(pv));
+dispatcher.RegisterOnBackInvokedCallback(
+OnBackInvokedDispatcher.PriorityDefault,
+_onBackInvokedCallback);
+_backCallbackRegistered = true;
+}
+
+[SupportedOSPlatform("android33.0")]
+private void UnregisterBackInvokedCallback(AWebView pv)
+{
+if (!_backCallbackRegistered || _onBackInvokedCallback is null)
+return;
+
+ResolveOwningActivity(pv.Context)?.OnBackInvokedDispatcher?
+.UnregisterOnBackInvokedCallback(_onBackInvokedCallback);
+_backCallbackRegistered = false;
+}
+
+// Resolve the Activity hosting this view from its Context. This avoids
+// Platform.CurrentActivity which is the most-recently-resumed activity
+// globally and is incorrect under multi-window / multi-activity.
+private static Android.App.Activity? ResolveOwningActivity(Context? ctx)
+{
+while (ctx is ContextWrapper cw)
+{
+if (cw is Android.App.Activity a)
+return a;
+ctx = cw.BaseContext;
+}
+return null;
+}
+
+sealed class BlazorOnBackInvokedCallback : Java.Lang.Object, IOnBackInvokedCallback
+{
+readonly WeakReference<AWebView> _weakWebView;
-public BlazorWebViewPredictiveBackCallback(BlazorWebViewHandler handler)
+public BlazorOnBackInvokedCallback(WeakReference<AWebView> weakWebView)
{
-_weakBlazorWebViewHandler = new WeakReference<BlazorWebViewHandler>(handler);
+_weakWebView = weakWebView;
}
public void OnBackInvoked()
{
-// KeyDown for Back button is handled in BlazorAndroidWebView.
-// Here we just need to check if it was handled there.
-// If not, we propagate the back press to the Activity's OnBackPressedDispatcher.
-if (_weakBlazorWebViewHandler is not null && _weakBlazorWebViewHandler.TryGetTarget(out var handler))
-{
-var webView = handler.PlatformView as BlazorAndroidWebView;
-if (webView is not null)
-{
-var wasBackNavigationHandled = webView.BackNavigationHandled;
-// reset immediately for next back event
-webView.BackNavigationHandled = false;
-
-if (!wasBackNavigationHandled)
-{
-if (webView.CanGoBack()) // If we can go back in WeView, Navigate back
-{
-webView.GoBack();
-return;
-}
-// Otherwise propagate back press to Activity
-(Microsoft.Maui.ApplicationModel.Platform.CurrentActivity as AndroidX.AppCompat.App.AppCompatActivity)?.OnBackPressedDispatcher?.OnBackPressed();
-}
-}
-}
+// Registration is the single source of truth — by the time this fires,
+// the registered state already implies CanGoBack() was true on the last
+// state recompute. Re-check defensively in case state moved underneath us.
+if (_weakWebView.TryGetTarget(out var webView) &&
+webView.IsAttachedToWindow &&
+webView.CanGoBack())
+{
+webView.GoBack();
+}
}
}
}
diff --git a/src/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cs b/src/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cs
--- a/src/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cs
+++ b/src/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cs
@@ -149,6 +149,17 @@ namespace Microsoft.AspNetCore.Components.WebView.Maui
// effect because once the page content loads all the document state gets reset.
RunBlazorStartupScripts(view);
}
+
+_webViewHandler?.UpdateBackNavigationState();
+}
+
+public override void DoUpdateVisitedHistory(AWebView? view, string? url, bool isReload)
+{
+base.DoUpdateVisitedHistory(view, url, isReload);
+// Covers Blazor client-side (SPA) navigations that use pushState/replaceState.
+// DoUpdateVisitedHistory fires for pushState on all supported Android API levels (24+).
+// replaceState does not add a new history entry so CanGoBack() is unaffected by it.
+_webViewHandler?.UpdateBackNavigationState();
}
private void RunBlazorStartupScripts(AWebView view)
diff --git a/src/BlazorWebView/tests/DeviceTests/Elements/BlazorWebViewTests.BackNavigation.cs b/src/BlazorWebView/tests/DeviceTests/Elements/BlazorWebViewTests.BackNavigation.cs
--- a/src/BlazorWebView/tests/DeviceTests/Elements/BlazorWebViewTests.BackNavigation.cs
+++ b/src/BlazorWebView/tests/DeviceTests/Elements/BlazorWebViewTests.BackNavigation.cs
@@ -2,7 +2,6 @@ using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components.WebView.Maui;
using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Maui.LifecycleEvents;
using Xunit;
namespace Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements;
@@ -11,13 +10,11 @@ public partial class BlazorWebViewTests
{
#if ANDROID
/// <summary>
-/// Verifies that BlazorWebViewHandler registers an OnBackPressed lifecycle event handler
-/// when connected on Android. This handler is essential for proper back navigation within
-/// the BlazorWebView on Android 13+ with predictive back gestures.
-/// See: https://github.com/dotnet/maui/issues/32767
+/// Verifies that, on initial load, the WebView has no back history so the
+/// IOnBackInvokedCallback is not registered (CanGoBack == false), which lets
+/// Android play the predictive back-to-home animation.
/// </summary>
[Fact]
-public async Task BlazorWebViewRegistersOnBackPressedHandler()
+public async Task BlazorWebViewBackCallbackDisabledWhenCannotGoBack()
{
EnsureHandlerCreated(additionalCreationActions: appBuilder =>
{
@@ -40,71 +37,8 @@ public partial class BlazorWebViewTests
var platformWebView = bwvHandler.PlatformView;
await WebViewHelpers.WaitForWebViewReady(platformWebView);
-// Get the lifecycle event service and verify OnBackPressed handler is registered
-var lifecycleService = MauiContext.Services.GetService<ILifecycleEventService>() as LifecycleEventService;
-Assert.NotNull(lifecycleService);
-
-// Verify the OnBackPressed event has been registered
-Assert.True(lifecycleService.ContainsEvent(nameof(AndroidLifecycle.OnBackPressed)),
-"BlazorWebViewHandler should register an OnBackPressed lifecycle event handler on Android");
-});
-}
-
-// The two follow-up tests that asserted lifecycle-handler cleanup and pre-Q OnKeyDown wiring
-// are removed: there is no LifecycleEventService participant in this fix, and OnKeyDown is
-// still present on BlazorAndroidWebView but is exercised by the existing platform back-key
-// flow rather than a unit-level assertion.
+// With no back history after initial load, CanGoBack is false so the
+// IOnBackInvokedCallback is intentionally NOT registered.
+Assert.False(platformWebView.CanGoBack(),
+"Initial load should leave the WebView with no back history.");
+});
+}
#endif
}
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added
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Collaborator
🤖 AI Summary
📊 Review Session —
|
| Test | Without Fix (expect FAIL) | With Fix (expect PASS) |
|---|---|---|
📱 BlazorWebViewTests (BlazorWebViewBackCallbackDisabledWhenCannotGoBack) Category=BlazorWebView |
✅ FAIL — 680s | ❌ FAIL — 1203s |
🔴 Without fix — 📱 BlazorWebViewTests (BlazorWebViewBackCallbackDisabledWhenCannotGoBack): FAIL ✅ · 680s
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Build succeeded.
0 Warning(s)
0 Error(s)
Time Elapsed 00:10:54.50
Run "dotnet tool restore" to make the "xharness" command available.
Tests completed with exit code: 1
🟢 With fix — 📱 BlazorWebViewTests (BlazorWebViewBackCallbackDisabledWhenCannotGoBack): FAIL ❌ · 1203s
(truncated to last 15,000 chars)
---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<<AttachAndRun>g__Run|21_0>d`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<AttachAndRun>d__21`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<>c__DisplayClass72_0`2.<<AttachAndRun>g__Run|0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Microsoft.Maui.IPlatformViewHandler, Microsoft.Maui, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.RunTest(Func`3 test)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.RunUrlResolutionTest(String path, String mode, Action`1 assertion)
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : Execution time: 30.170047
05-20 07:28:57.311 15805 16179 I DOTNET : Test trait name: Category
05-20 07:28:57.311 15805 16179 I DOTNET : value: BlazorWebView
05-20 07:28:57.311 15805 16179 I DOTNET :
05-20 07:28:57.311 15805 16179 I DOTNET : 17) [FAIL] BlazorWebViewWithoutDispatchFailsToGetScopedServices Test name: BlazorWebViewWithoutDispatchFailsToGetScopedServices
05-20 07:28:57.311 15805 16179 I DOTNET : Assembly: [Microsoft.Maui.MauiBlazorWebView.DeviceTests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]
05-20 07:28:57.311 15805 16179 I DOTNET : Exception messages: System.Exception : Waited 30000ms but couldn't get window.Blazor to be non-null *and* have window.__BlazorStarted to be true. Exception stack traces: at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.Retry(Func`1 tryAction, Func`2 createExceptionWithTimeoutMS)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.WaitForWebViewReady(WebView webview)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.<>c__DisplayClass31_0.<<BlazorWebViewWithoutDispatchFailsToGetScopedServices>b__1>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.BlazorWebViewWithoutDispatchFailsToGetScopedServices()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : Execution time: 30.0708483
05-20 07:28:57.311 15805 16179 I DOTNET : Test trait name: Category
05-20 07:28:57.311 15805 16179 I DOTNET : value: BlazorWebView
05-20 07:28:57.311 15805 16179 I DOTNET :
05-20 07:28:57.311 15805 16179 I DOTNET : 18) [FAIL] BasicRazorComponentClick Test name: BasicRazorComponentClick
05-20 07:28:57.311 15805 16179 I DOTNET : Assembly: [Microsoft.Maui.MauiBlazorWebView.DeviceTests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]
05-20 07:28:57.311 15805 16179 I DOTNET : Exception messages: System.Exception : Waited 30000ms but couldn't get window.Blazor to be non-null *and* have window.__BlazorStarted to be true. Exception stack traces: at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.Retry(Func`1 tryAction, Func`2 createExceptionWithTimeoutMS)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.WaitForWebViewReady(WebView webview)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.<>c__DisplayClass1_0.<<BasicRazorComponentClick>b__1>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.BasicRazorComponentClick()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : Execution time: 30.0835544
05-20 07:28:57.311 15805 16179 I DOTNET : Test trait name: Category
05-20 07:28:57.311 15805 16179 I DOTNET : value: BlazorWebView
05-20 07:28:57.311 15805 16179 I DOTNET :
05-20 07:28:57.311 15805 16179 I DOTNET : 19) [FAIL] RequestsCanBeInterceptedAndCustomDataReturnedForDifferentHosts Test name: RequestsCanBeInterceptedAndCustomDataReturnedForDifferentHosts(uriBase: "https://echo.free.beeceptor.com/sample-request") Test case: RequestsCanBeInterceptedAndCustomDataReturnedForDifferentHosts
05-20 07:28:57.311 15805 16179 I DOTNET : Assembly: [Microsoft.Maui.MauiBlazorWebView.DeviceTests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]
05-20 07:28:57.311 15805 16179 I DOTNET : Exception messages: System.Exception : Waited 30000ms but couldn't get window.Blazor to be non-null *and* have window.__BlazorStarted to be true. Exception stack traces: at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.Retry(Func`1 tryAction, Func`2 createExceptionWithTimeoutMS)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.WaitForWebViewReady(WebView webview)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.<>c__DisplayClass25_0.<<RunTest>b__1>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.HandlerTestBasement.<>c__DisplayClass20_0.<<AttachAndRun>b__0>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<<AttachAndRun>g__Run|21_0>d`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<AttachAndRun>d__21`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<>c__DisplayClass72_0`2.<<AttachAndRun>g__Run|0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Microsoft.Maui.IPlatformViewHandler, Microsoft.Maui, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.RunTest(Func`3 test)
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : Execution time: 30.2145377
05-20 07:28:57.311 15805 16179 I DOTNET : Test trait name: Category
05-20 07:28:57.311 15805 16179 I DOTNET : value: BlazorWebView
05-20 07:28:57.311 15805 16179 I DOTNET :
05-20 07:28:57.311 15805 16179 I DOTNET : 20) [FAIL] RequestsCanBeInterceptedAndCaseInsensitiveHeadersRead Test name: RequestsCanBeInterceptedAndCaseInsensitiveHeadersRead(uriBase: "https://echo.free.beeceptor.com/sample-request") Test case: RequestsCanBeInterceptedAndCaseInsensitiveHeadersRead
05-20 07:28:57.311 15805 16179 I DOTNET : Assembly: [Microsoft.Maui.MauiBlazorWebView.DeviceTests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]
05-20 07:28:57.311 15805 16179 I DOTNET : Exception messages: System.Exception : Waited 30000ms but couldn't get window.Blazor to be non-null *and* have window.__BlazorStarted to be true. Exception stack traces: at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.Retry(Func`1 tryAction, Func`2 createExceptionWithTimeoutMS)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.WebViewHelpers.WaitForWebViewReady(WebView webview)
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.<>c__DisplayClass25_0.<<RunTest>b__1>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.HandlerTestBasement.<>c__DisplayClass20_0.<<AttachAndRun>b__0>d.MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<<AttachAndRun>g__Run|21_0>d`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<AttachAndRun>d__21`1[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.DeviceTests.AssertionExtensions.<>c__DisplayClass72_0`2.<<AttachAndRun>g__Run|0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Microsoft.Maui.IPlatformViewHandler, Microsoft.Maui, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : at Microsoft.Maui.MauiBlazorWebView.DeviceTests.Elements.BlazorWebViewTests.RunTest(Func`3 test)
05-20 07:28:57.311 15805 16179 I DOTNET : --- End of stack trace from previous location ---
05-20 07:28:57.311 15805 16179 I DOTNET : Execution time: 30.1865163
05-20 07:28:57.311 15805 16179 I DOTNET : Test trait name: Category
05-20 07:28:57.311 15805 16179 I DOTNET : value: BlazorWebView
05-20 07:28:57.311 15805 16179 I DOTNET :
05-20 07:28:57.343 15805 16179 I DOTNET : Xml file was written to the provided writer.
05-20 07:28:57.344 15805 16179 I DOTNET : Tests run: 22 Passed: 1 Inconclusive: 0 Failed: 20 Ignored: 0
�[41m�[30mfail�[39m�[22m�[49m: Non-success instrumentation exit code: 1, expected: 0
�[40m�[32minfo�[39m�[22m�[49m: <<XHARNESS_RESULT_START>>
{
"version": 1,
"machineName": "runnervmfuwn7",
"exitCode": 1,
"exitCodeName": "TESTS_FAILED",
"platform": "android",
"instrumentationExitCode": 1,
"device": "emulator-5554",
"deviceOsVersion": "API 30",
"architecture": "x86_64",
"files": [
{
"name": "testResults.xml",
"type": "test-results"
},
{
"name": "adb-logcat-com.microsoft.maui.mauiblazorwebview.devicetests-default.log",
"type": "logcat"
}
]
}
<<XHARNESS_RESULT_END>>
�[40m�[32minfo�[39m�[22m�[49m: Attempting to remove apk 'com.microsoft.maui.mauiblazorwebview.devicetests'..
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.mauiblazorwebview.devicetests'
�[40m�[32minfo�[39m�[22m�[49m: Successfully uninstalled com.microsoft.maui.mauiblazorwebview.devicetests
XHarness exit code: 1 (TESTS_FAILED)
Tests completed with exit code: 1
⚠️ Failure Details
- ❌ BlazorWebViewTests (BlazorWebViewBackCallbackDisabledWhenCannotGoBack) FAILED with fix (should pass)
📁 Fix files reverted (206 files)
.config/dotnet-tools.jsoneng/Signing.propseng/Version.Details.xmleng/Versions.propseng/pipelines/ci-copilot.ymleng/pipelines/common/ui-tests.ymlsrc/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cssrc/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cssrc/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cssrc/Compatibility/Core/src/Android/Renderers/SwipeViewRenderer.cssrc/Compatibility/Core/src/MacOS/Extensions/NSMenuExtensions.cssrc/Compatibility/Core/src/iOS/EventTracker.cssrc/Compatibility/Core/src/iOS/Renderers/SwipeViewRenderer.cssrc/Controls/samples/Controls.Sample/Pages/Controls/MapsGalleries/MapPinsGallery.xamlsrc/Controls/samples/Controls.Sample/Pages/Controls/MapsGalleries/MapPinsGallery.xaml.cssrc/Controls/src/Build.Tasks/SetPropertiesVisitor.cssrc/Controls/src/Core/ActionSheetArguments.cssrc/Controls/src/Core/AlertArguments.cssrc/Controls/src/Core/BindableObject.cssrc/Controls/src/Core/BindableProperty.cssrc/Controls/src/Core/Button/Button.iOS.cssrc/Controls/src/Core/Compatibility/Android/Resources/layout/flyoutcontent.axmlsrc/Controls/src/Core/Compatibility/Handlers/FlyoutPage/iOS/PhoneFlyoutPageRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/NavigationPage/iOS/NavigationRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/SearchHandlerAppearanceTracker.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellFlyoutTemplatedContentRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellFragmentContainer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellItemRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellToolbarTracker.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/SearchHandlerAppearanceTracker.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellFlyoutLayoutManager.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellPageRendererTracker.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellSectionRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellSectionRootRenderer.cssrc/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellTableViewController.cssrc/Controls/src/Core/Editor/Editor.Mapper.cssrc/Controls/src/Core/Editor/Editor.iOS.cssrc/Controls/src/Core/Element/Element.cssrc/Controls/src/Core/Entry/Entry.Mapper.cssrc/Controls/src/Core/Entry/Entry.iOS.cssrc/Controls/src/Core/FlyoutPage/FlyoutPage.cssrc/Controls/src/Core/Handlers/Items/Android/Adapters/GroupableItemsViewAdapter.cssrc/Controls/src/Core/Handlers/Items/Android/Adapters/ItemsViewAdapter.cssrc/Controls/src/Core/Handlers/Items/Android/GridLayoutSpanSizeLookup.cssrc/Controls/src/Core/Handlers/Items/Android/MauiCarouselRecyclerView.cssrc/Controls/src/Core/Handlers/Items/Android/MauiRecyclerView.cssrc/Controls/src/Core/Handlers/Items/Android/TemplatedItemViewHolder.cssrc/Controls/src/Core/Handlers/Items/CarouselViewHandler.Windows.cssrc/Controls/src/Core/Handlers/Items/iOS/ItemsViewController.cssrc/Controls/src/Core/Handlers/Items/iOS/ItemsViewDelegator.cssrc/Controls/src/Core/Handlers/Items2/iOS/CarouselViewController2.cssrc/Controls/src/Core/Handlers/Items2/iOS/GroupableItemsViewController2.cssrc/Controls/src/Core/Handlers/Items2/iOS/ItemsViewController2.cssrc/Controls/src/Core/Handlers/Items2/iOS/ItemsViewDelegator2.cssrc/Controls/src/Core/Handlers/Items2/iOS/StructuredItemsViewController2.cssrc/Controls/src/Core/Handlers/Shell/Windows/ShellFlyoutItemView.cssrc/Controls/src/Core/Handlers/Shell/Windows/ShellView.cssrc/Controls/src/Core/Hosting/AppHostBuilderExtensions.cssrc/Controls/src/Core/ImageElement.cssrc/Controls/src/Core/Label/Label.Mapper.cssrc/Controls/src/Core/Label/Label.iOS.cssrc/Controls/src/Core/ListView/ListView.cssrc/Controls/src/Core/NavigationPage/NavigationPage.cssrc/Controls/src/Core/Page/Page.cssrc/Controls/src/Core/Platform/AlertManager/AlertManager.Android.cssrc/Controls/src/Core/Platform/AlertManager/AlertManager.cssrc/Controls/src/Core/Platform/Android/BottomNavigationViewUtils.cssrc/Controls/src/Core/Platform/Android/DragAndDropGestureHandler.cssrc/Controls/src/Core/Platform/Android/TabbedPageManager.cssrc/Controls/src/Core/Platform/ModalNavigationManager/ModalNavigationManager.iOS.cssrc/Controls/src/Core/Platform/Windows/CollectionView/ScrollHelpers.cssrc/Controls/src/Core/Platform/iOS/Extensions/FormattedStringExtensions.cssrc/Controls/src/Core/Platform/iOS/Extensions/LabelExtensions.cssrc/Controls/src/Core/PromptArguments.cssrc/Controls/src/Core/PublicAPI/net-android/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/net-ios/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/net-tizen/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/net/PublicAPI.Unshipped.txtsrc/Controls/src/Core/PublicAPI/netstandard/PublicAPI.Unshipped.txtsrc/Controls/src/Core/RadioButton/RadioButton.cssrc/Controls/src/Core/RadioButton/RadioButtonGroup.cssrc/Controls/src/Core/RadioButton/RadioButtonGroupController.cssrc/Controls/src/Core/ResourcesExtensions.cssrc/Controls/src/Core/Setter.cssrc/Controls/src/Core/Shadow.cssrc/Controls/src/Core/Shapes/Shape.cssrc/Controls/src/Core/Shell/Shell.cssrc/Controls/src/Core/Shell/ShellNavigationManager.cssrc/Controls/src/Core/SwipeView/SwipeItem.cssrc/Controls/src/Core/SwipeView/SwipeItemView.cssrc/Controls/src/Core/TabbedPage/TabbedPage.Windows.cssrc/Controls/src/Core/VisualElement/VisualElement.cssrc/Controls/src/Core/VisualStateManager.cssrc/Controls/src/Core/Window/Window.Android.cssrc/Controls/src/Core/Window/Window.cssrc/Controls/src/SourceGen/NodeSGExtensions.cssrc/Controls/src/Xaml/ApplyPropertiesVisitor.cssrc/Controls/src/Xaml/MarkupExtensions/OnIdiomExtension.cssrc/Controls/src/Xaml/MarkupExtensions/StaticResourceExtension.cssrc/Core/maps/src/Handlers/Map/MapHandler.Android.cssrc/Core/maps/src/Handlers/Map/MapHandler.iOS.cssrc/Core/maps/src/Handlers/MapPin/MapPinHandler.Android.cssrc/Core/maps/src/Platform/iOS/MauiMKMapView.cssrc/Core/maps/src/PublicAPI/net-android/PublicAPI.Unshipped.txtsrc/Core/src/Graphics/MauiDrawable.Android.cssrc/Core/src/Handlers/Button/ButtonHandler.Android.cssrc/Core/src/Handlers/Button/ButtonHandler.cssrc/Core/src/Handlers/Button/ButtonHandler.iOS.cssrc/Core/src/Handlers/DatePicker/DatePickerHandler.Android.cssrc/Core/src/Handlers/DatePicker/DatePickerHandler.MacCatalyst.cssrc/Core/src/Handlers/Editor/EditorHandler.iOS.cssrc/Core/src/Handlers/Entry/EntryHandler.cssrc/Core/src/Handlers/Entry/EntryHandler.iOS.cssrc/Core/src/Handlers/FlyoutView/FlyoutViewHandler.Android.cssrc/Core/src/Handlers/HybridWebView/HybridWebViewHandler.Standard.cssrc/Core/src/Handlers/HybridWebView/HybridWebViewHandler.Tizen.cssrc/Core/src/Handlers/HybridWebView/HybridWebViewHandler.Windows.cssrc/Core/src/Handlers/HybridWebView/HybridWebViewHandler.cssrc/Core/src/Handlers/Image/ImageHandler.Windows.cssrc/Core/src/Handlers/Image/ImageHandler.iOS.cssrc/Core/src/Handlers/Label/LabelHandler.cssrc/Core/src/Handlers/Label/LabelHandler.iOS.cssrc/Core/src/Handlers/Picker/PickerHandler.iOS.cssrc/Core/src/Handlers/RadioButton/RadioButtonHandler.cssrc/Core/src/Handlers/RadioButton/RadioButtonHandler.iOS.cssrc/Core/src/Handlers/RefreshView/RefreshViewHandler.Windows.cssrc/Core/src/Handlers/ScrollView/ScrollViewHandler.Android.cssrc/Core/src/Handlers/ScrollView/ScrollViewHandler.Windows.cssrc/Core/src/Handlers/ScrollView/ScrollViewHandler.iOS.cssrc/Core/src/Handlers/SearchBar/SearchBarHandler.iOS.cssrc/Core/src/Handlers/SearchBar/SearchBarHandler2.Android.cssrc/Core/src/Handlers/ShapeView/ShapeViewHandler.Standard.cssrc/Core/src/Handlers/ShapeView/ShapeViewHandler.cssrc/Core/src/Handlers/Stepper/StepperHandler.iOS.cssrc/Core/src/Handlers/SwipeItemMenuItem/SwipeItemMenuItemHandler.Android.cssrc/Core/src/Handlers/SwipeItemMenuItem/SwipeItemMenuItemHandler.iOS.cssrc/Core/src/Handlers/Switch/SwitchHandler.iOS.cssrc/Core/src/Handlers/TimePicker/TimePickerHandler.Android.cssrc/Core/src/Handlers/TimePicker/TimePickerHandler.Windows.cssrc/Core/src/Handlers/TimePicker/TimePickerHandler.cssrc/Core/src/Handlers/TimePicker/TimePickerHandler.iOS.cssrc/Core/src/Hosting/EssentialsMauiAppBuilderExtensions.cssrc/Core/src/Hosting/LifecycleEvents/AppHostBuilderExtensions.Android.cssrc/Core/src/Platform/Android/ActivityIndicatorExtensions.cssrc/Core/src/Platform/Android/ActivityResultCallbackRegistry.cssrc/Core/src/Platform/Android/BorderDrawable.cssrc/Core/src/Platform/Android/ContainerView.cssrc/Core/src/Platform/Android/EditTextExtensions.cssrc/Core/src/Platform/Android/MauiAppCompatActivity.Lifecycle.cssrc/Core/src/Platform/Android/MauiAppCompatActivity.cssrc/Core/src/Platform/Android/MauiHybridWebView.cssrc/Core/src/Platform/Android/MauiHybridWebViewClient.cssrc/Core/src/Platform/Android/MauiSearchView.cssrc/Core/src/Platform/Android/MauiSwipeRefreshLayout.cssrc/Core/src/Platform/Android/MauiSwipeView.cssrc/Core/src/Platform/Android/MauiWebView.cssrc/Core/src/Platform/Android/MauiWebViewClient.cssrc/Core/src/Platform/Android/Navigation/NavigationRootManager.cssrc/Core/src/Platform/Android/RadioButtonExtensions.cssrc/Core/src/Platform/Android/SafeAreaExtensions.cssrc/Core/src/Platform/Android/SearchViewExtensions.cssrc/Core/src/Platform/Android/TimePickerExtensions.cssrc/Core/src/Platform/Windows/ContentPanel.cssrc/Core/src/Platform/Windows/MauiPasswordTextBox.cssrc/Core/src/Platform/Windows/MauiToolbar.xaml.cssrc/Core/src/Platform/Windows/RadioButtonExtensions.cssrc/Core/src/Platform/Windows/RootNavigationView.cssrc/Core/src/Platform/Windows/ScrollViewerExtensions.cssrc/Core/src/Platform/Windows/TimePickerExtensions.cssrc/Core/src/Platform/iOS/ButtonExtensions.cssrc/Core/src/Platform/iOS/KeyboardAcceleratorExtensions.cssrc/Core/src/Platform/iOS/LayerExtensions.cssrc/Core/src/Platform/iOS/MauiPageControl.cssrc/Core/src/Platform/iOS/MauiScrollView.cssrc/Core/src/Platform/iOS/MauiSwipeView.cssrc/Core/src/Platform/iOS/MauiTextView.cssrc/Core/src/Platform/iOS/MauiView.cssrc/Core/src/Platform/iOS/PickerExtensions.cssrc/Core/src/Platform/iOS/TextFieldExtensions.cssrc/Core/src/Platform/iOS/TimePickerExtensions.cssrc/Core/src/Platform/iOS/WrapperView.cssrc/Core/src/PublicAPI/net-android/PublicAPI.Unshipped.txtsrc/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txtsrc/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txtsrc/Core/src/PublicAPI/net-windows/PublicAPI.Unshipped.txtsrc/Core/src/ViewExtensions.cssrc/Core/src/WindowExtensions.cssrc/Essentials/src/AssemblyInfo/AssemblyInfo.shared.cssrc/Essentials/src/Clipboard/Clipboard.shared.cssrc/Essentials/src/FilePicker/FilePicker.tizen.cssrc/Essentials/src/FileSystem/FileSystemUtils.android.cssrc/Essentials/src/FileSystem/FileSystemUtils.shared.cssrc/Essentials/src/MainThread/MainThread.netstandard.cssrc/Essentials/src/MainThread/MainThread.shared.cssrc/Essentials/src/MediaPicker/MediaPicker.ios.cssrc/Essentials/src/MediaPicker/MediaPicker.tizen.cssrc/Graphics/src/Graphics/Platforms/Android/PlatformGraphicsView.cssrc/Graphics/src/Graphics/Platforms/MaciOS/PlatformCanvas.cssrc/Graphics/src/Graphics/Platforms/Windows/PlatformGraphicsView.cssrc/Graphics/src/Graphics/Platforms/iOS/PlatformGraphicsView.cssrc/SingleProject/Resizetizer/src/GenerateTizenManifest.cssrc/SingleProject/Resizetizer/src/SkiaSharpSvgTools.cssrc/Templates/src/templates/maui-aspire-servicedefaults/MauiAspire.1.ServiceDefaults.csproj
New files (not reverted):
src/Controls/src/Core/Handlers/Items/iOS/IScrollTrackingDelegator.cssrc/Controls/src/Core/Platform/AlertManager/DelegateAlertSubscription.cssrc/Core/src/Handlers/HybridWebView/HybridWebViewHelper.cssrc/Core/src/Platform/Android/IBackNavigationState.cssrc/Core/src/Platform/Android/RefreshViewWebViewScrollCapture.cssrc/Core/src/ScreenshotDispatch.cs
🧪 UI Tests — ViewBaseTests
Detected UI test categories: ViewBaseTests
🧪 UI Test Execution Results
⏭️ SKIPPED — 0 passed, 0 failed, 1 skipped (platform: android)
| Category | Result | Tests | Duration | Notes |
|---|---|---|---|---|
ViewBaseTests |
⏭️ SKIPPED | — | 3.8s | Runner threw an exception |
Failures here are informational only — they do not block the gate or affect try-fix candidate scoring.
🔍 Pre-Flight — Context & Validation
Pre-Flight — PR #35538
Issue #35397 — [Android] BlazorWebView predictive back callback blocks Android back-to-home animation
Regression in: 10.0.11 (last good 10.0.10). Repro: Android 16, root page contains BlazorWebView, swipe back to home — predictive back-to-home animation does not play.
Root cause (from issue + code): BlazorWebViewHandler.Android.cs unconditionally registers an IOnBackInvokedCallback on API 33+ in ConnectHandler. Because that callback is always present, the Android system treats the activity as "has a back-handler at all times" and suppresses the back-to-home animation, even when the WebView has no history to go back to.
PR #35538 (head 391470fe, base inflight/current)
Approach: Replace IOnBackInvokedCallback + AndroidLifecycle.OnBackPressed with a single AndroidX OnBackPressedCallback. Enabled becomes the single source of truth:
- Set
Enabled = falseat construction (passesfalseto base ctor). - After every page navigation (
OnPageFinished) and Blazor SPA navigation (DoUpdateVisitedHistory), callUpdateBackNavigationState()which setsEnabled = PlatformView.CanGoBack(). - Inside
HandleOnBackPressed, if conditions aren't met (detached / unfocused / no history) the callback disables itself.
Files changed (5):
src/BlazorWebView/src/Maui/Android/BlazorAndroidWebView.cs— RemovesOnKeyDownoverride andBackNavigationHandledflag.src/BlazorWebView/src/Maui/Android/BlazorWebViewHandler.Android.cs— RemovesIOnBackInvokedCallback+ lifecycle hook; introducesBlazorWebViewBackCallback : OnBackPressedCallbackandUpdateBackNavigationState().src/BlazorWebView/src/Maui/Android/WebKitWebViewClient.cs— CallsUpdateBackNavigationState()inOnPageFinishedand the newly-overriddenDoUpdateVisitedHistory.src/Core/src/Platform/Android/IBackNavigationState.cs—interface→internal interface(cosmetic).src/BlazorWebView/tests/DeviceTests/Elements/BlazorWebViewTests.BackNavigation.cs— Old "registers lifecycle handler / cleans up on disconnect" tests deleted; replaced by singleBlazorWebViewBackCallbackDisabledWhenCannotGoBackwhich assertsplatformWebView.CanGoBack()isfalseafter the initial load.
Gate result (pre-completed): ❌ FAILED
The target test BlazorWebViewBackCallbackDisabledWhenCannotGoBack failed with the fix. Inspection of the truncated Helix log shows the failure is not an assertion failure inside the new test — every Blazor device test in the batch (BasicRazorComponentClick, BlazorWebViewWithoutDispatchFailsToGetScopedServices, RequestsCanBe…ForDifferentHosts, RequestsCanBeInterceptedAndCaseInsensitiveHeadersRead, etc.) hits the same System.Exception: Waited 30000ms but couldn't get window.Blazor to be non-null *and* have window.__BlazorStarted to be true at WebViewHelpers.WaitForWebViewReady. This is a CI/environment flake on the Helix device-test runner (the WebView never completed Blazor startup within 30s on this run) and is unrelated to the production diff. The without-fix run also failed (as expected), so the gate booked the result as FAILED.
Concerns with the PR's approach (used to seed alternative candidates)
Platform.CurrentActivity≠ this WebView's activity. Using the staticCurrentActivitycan wire the callback to the wrong activity in multi-window / multi-activity scenarios. The Activity attached to the WebView'sContextis the correct owner.HandleOnBackPresseddisabling itself is a one-shot escape hatch, not a delegation. SettingEnabled = falseinside the handler does not re-dispatch the current back press to the next callback in the LIFO dispatcher — it only affects future presses. So if the WebView's callback fires butHasWindowFocusorIsAttachedToWindowis false, the current press is silently swallowed. The comment in the code asserts otherwise, butOnBackPressedDispatcherdoes not re-dispatch within a single invocation.- Removing
OnKeyDownfromBlazorAndroidWebViewmay affect pre-Q hardware-back behavior in WebViews that have iframes/redirects whereWebView.canGoBack()returns true but the dispatcher chain has already advanced. DoUpdateVisitedHistoryruns forpushStatebut not always immediately forhistory.go(-1)ordering edge cases. Combined withOnPageFinishedit should be sufficient, but aWebChromeClient-level hook would be more robust.IBackNavigationStateaccessibility change is unrelated to this fix; it should be split out or removed.
These concerns drove the three alternative candidates in try-fix-1, try-fix-2, try-fix-3.
🔧 Fix — Analysis & Comparison
Try-Fix Aggregate — PR #35538
Summary
Generated three meaningfully different alternative fix candidates for issue #35397, driven by the maui-expert-reviewer agent and seeded by structural concerns identified in pre-flight.
Loop termination reason: the candidate space is exhausted across the two orthogonal design axes — which back API to use (IOnBackInvokedCallback vs AndroidX OnBackPressedCallback) × what to toggle (registration vs Enabled). Further variations would be trivial.
Testing constraint: the Helix device-test runner is not available in this sub-agent environment, so per-candidate "test" steps are static reasoning rather than executed runs. The PR-level gate had already been pre-completed and showed environmental flake (every Blazor test, not just the new one, timed out at WebViewHelpers.WaitForWebViewReady's 30s wait for window.Blazor). This is independent of the production diff.
Candidate matrix
| # | Approach | Back API | Toggle | Ownership | Pre-Q OnKeyDown |
|---|---|---|---|---|---|
| try-fix-1 | A | IOnBackInvokedCallback (33+) + OnKeyDown (≤32) |
Registration | Handler | ✅ kept |
| try-fix-2 | B | AndroidX OnBackPressedCallback (unified) |
Enabled |
Handler (+ view events) | ✅ kept |
| try-fix-3 | C | AndroidX OnBackPressedCallback (unified) |
Registration | View | ✅ kept |
| PR (current) | — | AndroidX OnBackPressedCallback (unified) |
Enabled |
Handler | ❌ removed |
Ranking (recommended → least)
A > C > B
-
Candidate A (try-fix-1) — recommended. Strongest fix: Android 16 suppresses the predictive back-to-home animation specifically because a callback is registered; toggling registration removes that signal entirely. Smallest blast radius (closest to git-history-proven behavior). Multi-window correctness for free via view-anchored
FindOnBackInvokedDispatcher(). PreservesOnKeyDownfor pre-Q hardware back. One open detail before merge: theFindOnBackInvokedDispatcherAPI matrix on API 33 vs 34+ — fallback toActivity.OnBackInvokedDispatcherfrom the view's ownContext. -
Candidate C (try-fix-3) — second. Architecturally cleanest (view-owned callback lifecycle is the canonical Android pattern). Also fixes a Shell-tab-switch case the PR doesn't handle. Lower confidence to land in a regression-fix PR due to larger code-review surface and higher risk of touching the test paths that timed out in the gate run.
-
Candidate B (try-fix-2) — acceptable. Smallest delta from the PR while correcting its two design bugs (wrong activity, broken
Enabled=falseself-disable). SameEnabled-toggle architecture as the PR, which means it inherits the same residual risk thatEnabled = falsemay not unblock the predictive animation on every Android 16 OEM ROM.
Concerns about the PR's current fix (recap)
All three candidates address one or more of these:
Microsoft.Maui.ApplicationModel.Platform.CurrentActivityis the wrong activity in multi-window / multi-activity. The Activity attached to the WebView's ownContextis correct.- Setting
Enabled = falseinsideHandleOnBackPresseddoes not re-dispatch the current back press to the next LIFO callback. The code comment that asserts otherwise is incorrect; the current press is silently swallowed. - Removing
BlazorAndroidWebView.OnKeyDownmay regress pre-Q hardware-back behavior in WebViews with iframe history. - The
IBackNavigationStateaccessibility change is unrelated noise that should be split out of this PR.
Per-candidate artifacts
try-fix-1/content.md— Candidate Atry-fix-2/content.md— Candidate Btry-fix-3/content.md— Candidate C
Recommendation to PR author
Adopt Candidate A (try-fix-1). Restore BlazorAndroidWebView.OnKeyDown, revert to IOnBackInvokedCallback on API 33+ but register/unregister dynamically based on CanGoBack() && IsAttachedToWindow, anchor the dispatcher lookup to the WebView (pv.FindOnBackInvokedDispatcher() with an Activity.OnBackInvokedDispatcher fallback on API 33), and drop the unrelated IBackNavigationState accessibility change from this PR.
📋 Report — Final Recommendation
Comparative Report — PR #35538
Issue and PR
- Issue [Android] BlazorWebView predictive back callback blocks Android back-to-home animation #35397 —
[Android] BlazorWebView predictive back callback blocks Android back-to-home animation(regression in 10.0.11). - PR [Android] Fix for BlazorWebView predictive back callback blocks Android back-to-home animation #35538 head
391470fe(baseinflight/current). - Root cause:
BlazorWebViewHandler.Android.csunconditionally registers anIOnBackInvokedCallbackon API 33+ inConnectHandler. With a callback always registered, Android 16 suppresses the back-to-home animation even when the WebView has no back history.
Candidate inventory
| Candidate | Back API | What toggles | Activity owner | Pre-Q OnKeyDown |
Diff size |
|---|---|---|---|---|---|
pr |
AndroidX OnBackPressedCallback (unified) |
Enabled |
Platform.CurrentActivity ❌ |
❌ removed | -195/+83 |
pr-plus-reviewer |
AndroidX OnBackPressedCallback (unified) |
Enabled (continuously updated) |
view-anchored ✅ | ✅ restored | similar to pr + view events |
try-fix-1 |
IOnBackInvokedCallback (33+) + OnKeyDown (≤32) |
Registration | view-anchored ✅ | ✅ kept | smallest behavioral delta from 10.0.10 |
try-fix-2 |
AndroidX OnBackPressedCallback |
Enabled (continuously updated) |
view-anchored ✅ | ✅ restored | same as pr-plus-reviewer |
try-fix-3 |
AndroidX OnBackPressedCallback (View-owned) |
Registration | view-anchored ✅ | ✅ kept | largest — moves ownership to View |
Note: pr-plus-reviewer and try-fix-2 are conceptually identical (Enabled-toggle architecture with all PR design bugs fixed). They are presented separately to satisfy the schema but are scored together below.
Gate status (shared across all candidates)
Pre-completed gate: ❌ FAILED, but the failure is environmental — every Blazor device test in the Helix batch timed out at WebViewHelpers.WaitForWebViewReady's 30 s wait for window.Blazor to become non-null. The without-fix run also failed (as expected for a presence-check gate). Per task instruction the gate is not re-run. Because the failure is environmental and shared across every Blazor test in the batch, no candidate is differentially penalized. None of the candidates "passed regression tests" and none "failed regression tests" in the differential sense — the regression test never executed cleanly on either side of the comparison.
Scoring axes
- Predictive-animation guarantee (Android 16): "Registration toggle" > "
Enabledtoggle". With no callback registered, AOSP contract plays the back-to-home animation; withEnabled = falseon a registered callback, behavior depends on AndroidX 1.8+ semantics and OEM ROM compliance (this is the exact behavior the regression originated from). - Activity-owner correctness (multi-window / multi-activity): view-anchored >
Platform.CurrentActivity. - Self-disable correctness:
Enabledcontinuously updated from focus/attach/navigation >Enabled = falseinsideHandleOnBackPressed(current press is silently swallowed; the next press is the first to honor the new state). - Pre-Q hardware-back coverage:
OnKeyDownpreserved > removed. - Blast radius: smaller diff with closer affinity to last-known-good (10.0.10) > larger architectural rework.
- Test correctness: asserting the new code path's invariant > asserting a property of
Android.Webkit.WebView.
Per-candidate scoring
| Anim guarantee | Activity owner | Self-disable | Pre-Q hw back | Blast radius | Test quality | |
|---|---|---|---|---|---|---|
pr |
⚠ depends on Enabled = false |
❌ Platform.CurrentActivity |
❌ silently swallows current press | ❌ removed | ✅ moderate | ⚠ thin |
pr-plus-reviewer |
⚠ depends on Enabled = false |
✅ view-anchored | ✅ continuously honest | ✅ restored | ✅ moderate | ⚠ thin |
try-fix-1 |
✅ registration toggle | ✅ view-anchored | ✅ N/A (registration) | ✅ kept | ✅ closest to 10.0.10 | ⚠ thin |
try-fix-2 |
⚠ depends on Enabled = false |
✅ view-anchored | ✅ continuously honest | ✅ restored | ✅ moderate | ⚠ thin |
try-fix-3 |
✅ registration toggle | ✅ view-anchored | ✅ N/A (registration) | ✅ kept | ⚠ largest | ⚠ thin |
Ranking
try-fix-1 > try-fix-3 > pr-plus-reviewer ≈ try-fix-2 > pr
try-fix-1(Candidate A) ranks first: it is the only candidate that gives the AOSP-contract animation guarantee (registration toggle) and has the smallest behavioral delta from the last-known-good 10.0.10 code (keptIOnBackInvokedCallbackon 33+, keptOnKeyDownon ≤32, fixed the bug by toggling registration). One implementation refinement is required before merge — handlingOnBackInvokedDispatcherresolution on API 33 vs 34+ (use the view's owning activity'sOnBackInvokedDispatcher, notPlatform.CurrentActivity).try-fix-3(Candidate C) ranks second: same animation guarantee but with a larger architectural rework (ownership moves intoBlazorAndroidWebView). Lower confidence to land late in a release cycle.pr-plus-reviewerandtry-fix-2(Candidate B) tie for third: they correctly fix the activity-owner and self-disable bugs and restoreOnKeyDown, but they still rely onEnabled = falseto release the gesture — the residual Android 16 OEM-ROM risk remains.prranks last: it ships the activity-owner bug, the broken self-disable comment claim, removes pre-QOnKeyDowndefense, and carries an unrelatedIBackNavigationStateaccessibility no-op.
Winner
try-fix-1. It addresses the root cause directly (no callback registered ⇒ AOSP guarantees the back-to-home animation), keeps the codebase closest to the last shipping version, preserves all defense-in-depth paths the PR removed, and avoids both design bugs the reviewer identified in pr. The required implementation refinement (resolve OnBackInvokedDispatcher from the view's owning activity rather than Platform.CurrentActivity) is included in the winner manifest's candidateDiff.
Concerns the winner does not address
- Test coverage thinness. The PR's replacement test only asserts
platformWebView.CanGoBack() == falseafter the initial load — a property ofAndroid.Webkit.WebView, not of the new BlazorWebView code path. Whichever candidate ships, the test should be strengthened to actually exercise the callback-registration invariant. Out of scope for a regression fix; track as follow-up. - Environmental Helix flake is unrelated to any candidate and must be diagnosed separately.
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Upon further investigation, the PR's original fix (OnBackPressedCallback + Enabled toggling) is the correct and sufficient approach for this issue. The gate failure shown in the summary was related to test infrastructure/timing and not to code correctness. The fix correctly restores the predictive back to home animation. This approach is also intentionally consistent with the already merged PR #35223, which used the same OnBackPressedCallback + Enabled pattern to fix the same animation issue at the activity level for standard MAUI navigation. try-fix-1 was also evaluated. It works after adapting for .NET Android binding differences (OnBackInvokedDispatcher.PriorityDefault is not exposed as a named constant and was replaced with const int = 0, and Android.App.Activity requires the global:: prefix). However, it introduces additional complexity without necessity, since the PR's simpler approach already passes the gate and resolves the issue correctly. |
sheiksyedm
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May 21, 2026 08:53
This was referenced May 21, 2026
kubaflo
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May 21, 2026
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Looks like this PR introduced a regression: #35573 |
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PureWeen
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Jun 2, 2026
…id back-to-home animation (#35538) > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue details The predictive back-to-home animation on Android does not play when a `BlazorWebView` is present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition. ### Root Cause The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered. ### Description of Change The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation. To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler. ### Why Tests were not added: **Regarding the test case:** This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling. Tested the behavior in the following platforms. - [x] Android - [ ] Mac - [ ] iOS - [ ] Windows ### Issues Fixed Fixes #35397 ### Output | Before Issue Fix | After Issue Fix | |----------|----------| | <video width="270" height="600" src="https://github.com/user-attachments/assets/c817cac7-2b93-4d01-9b1f-dc83651f7485"> | <video width="270" height="600" src="https://github.com/user-attachments/assets/5ce098e0-a51a-4abf-8b50-e9130f763db0"> |
PureWeen
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Jun 11, 2026
…id back-to-home animation (#35538) > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue details The predictive back-to-home animation on Android does not play when a `BlazorWebView` is present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition. ### Root Cause The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered. ### Description of Change The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation. To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler. ### Why Tests were not added: **Regarding the test case:** This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling. Tested the behavior in the following platforms. - [x] Android - [ ] Mac - [ ] iOS - [ ] Windows ### Issues Fixed Fixes #35397 ### Output | Before Issue Fix | After Issue Fix | |----------|----------| | <video width="270" height="600" src="https://github.com/user-attachments/assets/c817cac7-2b93-4d01-9b1f-dc83651f7485"> | <video width="270" height="600" src="https://github.com/user-attachments/assets/5ce098e0-a51a-4abf-8b50-e9130f763db0"> |
PureWeen
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Jun 22, 2026
…id back-to-home animation (#35538) > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue details The predictive back-to-home animation on Android does not play when a `BlazorWebView` is present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition. ### Root Cause The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered. ### Description of Change The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation. To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler. ### Why Tests were not added: **Regarding the test case:** This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling. Tested the behavior in the following platforms. - [x] Android - [ ] Mac - [ ] iOS - [ ] Windows ### Issues Fixed Fixes #35397 ### Output | Before Issue Fix | After Issue Fix | |----------|----------| | <video width="270" height="600" src="https://github.com/user-attachments/assets/c817cac7-2b93-4d01-9b1f-dc83651f7485"> | <video width="270" height="600" src="https://github.com/user-attachments/assets/5ce098e0-a51a-4abf-8b50-e9130f763db0"> |
kubaflo
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Jun 25, 2026
…id back-to-home animation (#35538) > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue details The predictive back-to-home animation on Android does not play when a `BlazorWebView` is present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition. ### Root Cause The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered. ### Description of Change The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation. To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler. ### Why Tests were not added: **Regarding the test case:** This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling. Tested the behavior in the following platforms. - [x] Android - [ ] Mac - [ ] iOS - [ ] Windows ### Issues Fixed Fixes #35397 ### Output | Before Issue Fix | After Issue Fix | |----------|----------| | <video width="270" height="600" src="https://github.com/user-attachments/assets/c817cac7-2b93-4d01-9b1f-dc83651f7485"> | <video width="270" height="600" src="https://github.com/user-attachments/assets/5ce098e0-a51a-4abf-8b50-e9130f763db0"> |
kubaflo
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Jul 3, 2026
…id back-to-home animation (#35538) > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue details The predictive back-to-home animation on Android does not play when a `BlazorWebView` is present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition. ### Root Cause The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered. ### Description of Change The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation. To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler. ### Why Tests were not added: **Regarding the test case:** This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling. Tested the behavior in the following platforms. - [x] Android - [ ] Mac - [ ] iOS - [ ] Windows ### Issues Fixed Fixes #35397 ### Output | Before Issue Fix | After Issue Fix | |----------|----------| | <video width="270" height="600" src="https://github.com/user-attachments/assets/c817cac7-2b93-4d01-9b1f-dc83651f7485"> | <video width="270" height="600" src="https://github.com/user-attachments/assets/5ce098e0-a51a-4abf-8b50-e9130f763db0"> |
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PureWeen
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Jul 6, 2026
## What's Coming .NET MAUI inflight/candidate introduces significant improvements across all platforms with focus on quality, performance, and developer experience. This release includes 153 commits with various improvements, bug fixes, and enhancements. ## Activityindicator - [Android] Fix CollectionView ActivityIndicator not animating after header height change by @Vignesh-SF3580 in #35358 <details> <summary>🔧 Fixes</summary> - [CollectionView items fail to update ActivityIndicator state after header height change](#33780) </details> ## Animation - [Android] Fix Shadow property affecting transform matrix. by @Shalini-Ashokan in #32962 <details> <summary>🔧 Fixes</summary> - [[Android] Applying Shadow property affects the properties in Visual Transform Matrix](#32731) </details> ## API - Add delegate-based alert dialog extensibility convention (no public API changes) by @Redth in #35095 <details> <summary>🔧 Fixes</summary> - [Alert/Dialog system (`DisplayAlert`, `DisplayActionSheet`, `DisplayPromptAsync`) needs a public extensibility point](#34104) </details> ## Blazor - [Android] Fix for BlazorWebView predictive back callback blocks Android back-to-home animation by @BagavathiPerumal in #35538 <details> <summary>🔧 Fixes</summary> - [[Android] BlazorWebView predictive back callback blocks Android back-to-home animation](#35397) </details> - [Android] Fix BlazorWebView back callback can swallow the first Back press when its callback is stale-enabled by @devanathan-vaithiyanathan in #35611 <details> <summary>🔧 Fixes</summary> - [[inflight regression] Android BlazorWebView back callback can swallow the first Back press when its callback is stale-enabled](#35573) </details> ## Border - [Windows] Fixed the ContentView clip is not updated when wrapping inside the Border by @Ahamed-Ali in #30408 <details> <summary>🔧 Fixes</summary> - [[Windows] ContentView clip is not updated when wrapping inside the Border](#30404) </details> - Fix Border.StrokeDashArray leaks dashed Borders when using a shared Application resource by @devanathan-vaithiyanathan in #35544 <details> <summary>🔧 Fixes</summary> - [`Border.StrokeDashArray` leaks dashed Borders when using a shared Application resource](#35492) </details> - [Windows] Border: Add AutomationPeer support by @Vignesh-SF3580 in #35577 <details> <summary>🔧 Fixes</summary> - [Adding AutomationPeers to Windows Borders](#27627) </details> - [Windows] Fixed BoxView improper rendering inside Border by @Dhivya-SF4094 in #28465 <details> <summary>🔧 Fixes</summary> - [[Windows] Issues with BoxView Placement Inside Border](#19668) </details> ## Button - Prevent NullReferenceException in LayoutButton by @GamesAgeddon in #35284 <details> <summary>🔧 Fixes</summary> - [NullReferenceException on iOS in Button.LayoutButton from WrapperView.LayoutSubviews](#31048) </details> - Fix TextColor null reset to restore platform defaults on iOS and Android by @Shalini-Ashokan in #35563 <details> <summary>🔧 Fixes</summary> - [[Windows, Android, iOS & Mac]Button TextColor does not restore to platform default when reset to null after dynamic update](#35513) </details> ## CollectionView - Fix CollectionView grid spacing updates for first row and column by @KarthikRajaKalaimani in #34527 <details> <summary>🔧 Fixes</summary> - [[MAUI] I2_Vertical grid for horizontal Item Spacing and Vertical Item Spacing - horizontally updating the spacing only applies to the second column](#34257) </details> - [MacCatalyst] Fix CollectionView Header/Footer Not Expanding to Content Width by @KarthikRajaKalaimani in #35213 <details> <summary>🔧 Fixes</summary> - [[MacOS][CV2] I8_View header and footer_Horizontal_View - Footer on the right doesn't adapt when resizing the window](#35113) </details> - [iOS/MacCatalyst] Fix IndicatorView not updating when IndicatorSize is changed to default value by @Shalini-Ashokan in #35215 <details> <summary>🔧 Fixes</summary> - [[iOS/MacCatalyst] IndicatorView does not update when IndicatorSize is dynamically changed to the default value](#35214) </details> - CollectionView selecteditem background lost if collectionview (or parent) IsEnabled changed. by @KarthikRajaKalaimani in #31540 <details> <summary>🔧 Fixes</summary> - [CollectionView selecteditem background lost if collectionview (or parent) IsEnabled changed.](#20615) </details> - [iOS/macOS] CollectionView: Fix FlowDirection not working on EmptyView by @Dhivya-SF4094 in #32674 <details> <summary>🔧 Fixes</summary> - [[iOS, MacOS] FlowDirection not working on EmptyView in CollectionView](#32404) - [[iOS, Mac] CollectionView EmptyViewTemplate content text is mirrored when FlowDirection is RightToLeft](#34522) </details> - Fix iOS CollectionView stale layout invalidations by @filipnavara in #35245 <details> <summary>🔧 Fixes</summary> - [[iOS] CollectionView tries to invalidate cells with invalid indexes](#35244) </details> - Fix Android grouped CollectionView header/footer rebind leak by @AdamEssenmacher in #35368 <details> <summary>🔧 Fixes</summary> - [Memory leak when scrolling a CollectionView with IsGrouped=true](#17698) </details> - [Windows] Fix for Item should scrolled based on the GroupHeaderTemplate by @SuthiYuvaraj in #28074 <details> <summary>🔧 Fixes</summary> - [I9_Scroll by object for grouped data - The group name is always pined at the top after clicking 'Scroll to Proboscis Monkey' button](#27922) </details> - [Android] Fix ScrollTo regression when IsGrouped true on CollectionView by @SubhikshaSf4851 in #35356 <details> <summary>🔧 Fixes</summary> - [[10.0.60] ScrollTo(0) not working anymore on CollectionView when IsGrouped="True"](#35313) </details> - [Android] Fix CollectionView scrolling performance regression by @devanathan-vaithiyanathan in #35379 <details> <summary>🔧 Fixes</summary> - [[10.0.60] CollectionView scrolling performance regression](#35344) </details> - Optimize parent dynamic resource refresh by @AdamEssenmacher in #35408 <details> <summary>🔧 Fixes</summary> - [Memory usage increases when scrolling collectionview if resources count is more than 191](#22053) </details> - Fix CI failure for CollectionView Scrolling Feature Tests due to PR #35379 by @devanathan-vaithiyanathan in #35536 - [iOS & Mac] CarouselViewController2 leaks on iOS/MacCatalyst due to unremoved orientation notification observer by @SubhikshaSf4851 in #35532 <details> <summary>🔧 Fixes</summary> - [CarouselViewController2 leaks on iOS/MacCatalyst due to unremoved orientation notification observer](#35472) </details> - Fix CollectionView.SelectedItems leaks popped views when bound to a retained ObservableCollection by @HarishwaranVijayakumar in #35558 <details> <summary>🔧 Fixes</summary> - [`CollectionView.SelectedItems` leaks popped views when bound to a retained `ObservableCollection`](#35497) </details> - Fix for Android - Dynamic Updates to CollectionView Header/Footer and Templates Are Not Displayed by @SuthiYuvaraj in #28904 <details> <summary>🔧 Fixes</summary> - [Android - Dynamic Updates to CollectionView Header/Footer and Templates Are Not Displayed](#28676) </details> - [Windows] Fix CarouselView EmptyView display when filtering to zero items by @Shalini-Ashokan in #29247 <details> <summary>🔧 Fixes</summary> - [[Windows] [Scenario Day] EmptyView using Template displayed at the same time as the content](#7150) </details> - [Android/iOS] Fix IsEnabled=False on CollectionView not working by @devanathan-vaithiyanathan in #27749 <details> <summary>🔧 Fixes</summary> - [[iOS/Android] CollectionView IsEnabled Not Working](#27770) </details> - Fix CarouselView.Loop property does not update dynamically and fails to maintain the scroll position when the loop value is changed at runtime by @devanathan-vaithiyanathan in #29527 <details> <summary>🔧 Fixes</summary> - [[Android] CarouselView.Loop = false causes crash on Android when changed at runtime](#29411) - [Loop Binding in CarouselView Not Updating Dynamically at Runtime](#29449) </details> - [iOS / Mac] Fix CollectionView.ScrollTo(index) silently failing whenIsGrouped="True" by @Dhivya-SF4094 in #35609 <details> <summary>🔧 Fixes</summary> - [CollectionView.ScrollTo(index) doesn't work correctly when IsGrouped="True" on iOS, MacCatalyst, and Windows](#35326) </details> - Fix Android nested carousel scrolling by @AdamEssenmacher in #35656 <details> <summary>🔧 Fixes</summary> - [Vertical scrolling not working for CarouselView and CustomLayouts](#7814) </details> - [Inflight regression] Fixed Test failures ModalTabbedPagePushAsyncShouldOverlayBottomNavigationView and GroupedCollectionViewScrollToIndexScrollsToCorrectItem by @Dhivya-SF4094 in #35823 - Fix CarouselView tests fail in June 8 Candidate by @devanathan-vaithiyanathan in #35825 ## Core - Reduce allocations on AnimationManager by @pictos in #35612 <details> <summary>🔧 Fixes</summary> - [AnimationManager is allocating a lot](#35654) </details> ## Core Lifecycle - Fix device test memory by @pictos in #35487 <details> <summary>🔧 Fixes</summary> - [Memory leak Device.Test pass with false positive](#35485) </details> ## Datepicker - Fix MacCatalyst DatePicker focus handling by @AdamEssenmacher in #35553 <details> <summary>🔧 Fixes</summary> - [[mauipalooza] DatePicker focus only works first time](#5947) </details> ## DateTimePicker - [Android] Fix DatePicker dialog dismisses after the device is rotated by @HarishwaranVijayakumar in #34980 <details> <summary>🔧 Fixes</summary> - [[Android] [Regression] DatePicker dialog dismisses after the device is rotated](#34973) </details> ## Docs - doc: Add paragraph to README.md explaining how to fetch the `maui` project templates by @durandt in #34561 ## Drawing - [Android] Fix LinearGradientBrush rendering as opaque black box by @SubhikshaSf4851 in #35299 <details> <summary>🔧 Fixes</summary> - [[Regression] LinearGradientBrush broken on Android in 10.0.60](#35280) - [10.0.60 breaks transparency on Brushes (on Android?)](#35354) </details> - Fix polygon points collection handler leak by @AdamEssenmacher in #35526 <details> <summary>🔧 Fixes</summary> - [PolygonHandler and PolylineHandler leak when Points is replaced before disconnect](#35387) </details> ## Editor - [iOS] Fix Editor losing scrollability after rotation when CharacterSpacing is applied by @Vignesh-SF3580 in #35309 <details> <summary>🔧 Fixes</summary> - [[.NET 10][iOS] D2 - Editor can't be scrolled after rotating simulator.](#35114) </details> - [Inflight/Candidate][iOS & Mac] Fix for Editor height inconsistency when VerticalTextAlignment is Center or End on iOS and MacCatalyst by @BagavathiPerumal in #35662 <details> <summary>🔧 Fixes</summary> - [[MAUI] D13_Customize_Text_Alignment - Text Editor Height is not consistent](#35615) </details> ## Entry - [iOS/Mac] Fix Entry clear button retaining tint color after TextColor is reset to null by @SyedAbdulAzeemSF4852 in #35177 <details> <summary>🔧 Fixes</summary> - [[iOS/Mac]Entry ClearButtonVisibility color does not reset when TextColor is set to null](#35076) </details> - [iOS/MacCatalyst] Fix Entry clear button appearing dimmed compared to TextColor by @SyedAbdulAzeemSF4852 in #35541 <details> <summary>🔧 Fixes</summary> - [[MacCatalyst] [Entry] ClearButtonVisibility color appears dimmed compared to TextColor](#35517) </details> - Fix pill-shaped focus ring on macOS 26 by @Dhivya-SF4094 in #35393 <details> <summary>🔧 Fixes</summary> - [.Net 10 Picker item not centered and wrong focus outline of Entry on Mac](#34899) </details> - Fix Entry select all text on refocus not working on WinUI by @kubaflo in #35383 ## Essentials - [Android] Fix Capture video crashes after stopping recording on Android 12 by @HarishwaranVijayakumar in #35638 <details> <summary>🔧 Fixes</summary> - [Capture video crashes after stopping recording on Android 12](#28891) </details> - [Essentials] Browser.OpenAsync(External): drop visibility-filtered ResolveActivity pre-check by @Kebechet in #35652 <details> <summary>🔧 Fixes</summary> - [Browser.OpenAsync(External) on Android throws FeatureNotSupportedException for verified App Link owner URLs even with documented <queries> fix applied](#35651) </details> ## Essentials Texttospeech - [Mac, iOS, Windows] Fix for inconsistent Text-to-Speech rate behavior by @HarishwaranVijayakumar in #32850 <details> <summary>🔧 Fixes</summary> - [[Essentials] TTS rate](#32492) </details> ## Flyoutpage - [iOS/Mac] Fix FlyoutPage RTL FlowDirection is not working by @devanathan-vaithiyanathan in #34831 <details> <summary>🔧 Fixes</summary> - [[iOS/Mac] FlyoutPage RTL FlowDirection is not working properly](#34830) </details> - [Android] Fix for Android 16 Back button is not working after command from FlyoutPage by @BagavathiPerumal in #35196 <details> <summary>🔧 Fixes</summary> - [Android: BackButton on Android 16 not working after command from FlyOutPage](#33508) </details> ## Gestures - Fix DragGestureRecognizer.DropCompleted event not firing in Android platform by @KarthikRajaKalaimani in #35179 <details> <summary>🔧 Fixes</summary> - [[Android] DragGestureRecognizer.DropCompleted event not firing](#17554) </details> - Windows: Ensure layouts without background participate in hit testing by @jpd21122012 in #34364 <details> <summary>🔧 Fixes</summary> - [[Windows] TapGestureRecognizer does NOT work on a ContentView without Background](#32279) </details> - [iOS] Fix VoiceOver dropping child labels on layouts with SemanticProperties.Hint or TapGestureRecognizer by @Vignesh-SF3580 in #35590 <details> <summary>🔧 Fixes</summary> - [[iOS] VoiceOver does not correctly describe View with GestureRecognizers](#34380) </details> ## Hybridwebview - Fix RemovePossibleQueryString to also strip URL fragments by @kubaflo in #35551 <details> <summary>🔧 Fixes</summary> - [HybridWebViewQueryStringHelper.RemovePossibleQueryString removes '?' but not other special characters e.g. '#'](#31472) </details> - [Revert] - [Windows] Fix WebView blank rendering when used with HybridWebView by @SubhikshaSf4851 in #35814 ## Image - Avoid image source layout invalidation for fixed-size views by @AdamEssenmacher in #35369 <details> <summary>🔧 Fixes</summary> - [Image source swaps thrash layout under fixed constraints, tanking frame rate when scrolling virtualized collections](#32457) </details> - [Windows] Fix Image layout inconsistency caused by async decode race in GetDesiredSize by @praveenkumarkarunanithi in #34699 <details> <summary>🔧 Fixes</summary> - [[Windows] Image cropping produces inconsistent results when window is minimized or resized](#32393) </details> - [Testing] Include more testing around Windows Image Aspect recent fixes by @kubaflo in #35620 <details> <summary>🔧 Fixes</summary> - [[Testing] Include more testing around Windows Image Aspect recent fixes](#31686) </details> - Revert PR #30068 — Fix FontImageSource centering regression on Windows by @Shalini-Ashokan in #35642 <details> <summary>🔧 Fixes</summary> - [[Windows] Image with FontImageSource is not centered and gets clipped when WidthRequest/HeightRequest equals FontImageSource Size](#35618) </details> - [Android] Fix screenshot from WebView content not working by @kubaflo in #35384 <details> <summary>🔧 Fixes</summary> - [[Android] Loading the captured screenshot from webview content to Image control does not visible](#30010) </details> ## Label - Improve label mapping performance and ensure complete coverage including ToPlatform and subsequent property changes by @Tamilarasan-Paranthaman in #31159 - Fix for Label.FormattedText leaks labels when shared FormattedString is stored in Application.Resources by @BagavathiPerumal in #35582 <details> <summary>🔧 Fixes</summary> - [`Label.FormattedText` leaks labels when shared `FormattedString` is stored in `Application.Resources`](#35495) </details> - [iOS] Fix Label Span formatting test failures on candidate branch by @Vignesh-SF3580 in #35815 ## Layout - [iOS, Mac] Fix Item spacing not properly applied between items in Horizontal LinearItemsLayout by @Dhivya-SF4094 in #35445 <details> <summary>🔧 Fixes</summary> - [[CollectionView2] Item spacing not properly applied between items in Horizontal LinearItemsLayout](#35429) </details> - [Windows] Add Automation Id support for Layouts. by @SubhikshaSf4851 in #35562 <details> <summary>🔧 Fixes</summary> - [[Windows] AutomationId does not work for ContentView, Layouts and controls that inherit them](#4715) </details> - Avoid layout diagnostics allocations without listeners by @AdamEssenmacher in #35475 <details> <summary>🔧 Fixes</summary> - [MAUI 10 layout diagnostics no-consumer path is not zero-allocation](#35473) </details> - [Windows/Android] FlexLayout: Fix wrap misalignment due to floating-point precision by @SuthiYuvaraj in #31341 <details> <summary>🔧 Fixes</summary> - [FlexLayout Wrap Misalignment with Dynamically-Sized Buttons in .NET MAUI](#30957) </details> ## Listview - Fix Binding for ListView.IsRefreshing by @bill2004158 in #28516 <details> <summary>🔧 Fixes</summary> - [Bind ListView.IsRefreshing is not work.](#28514) </details> ## Map - Fix iOS/Catalyst MapPool retention with MapElements by @AdamEssenmacher in #35480 <details> <summary>🔧 Fixes</summary> - [iOS/Mac Catalyst MapHandler leaks MAUI Map views and MapElements through MapPool](#35479) </details> - Fix Android map view lifecycle cleanup by @AdamEssenmacher in #35476 <details> <summary>🔧 Fixes</summary> - [Navigating to a page with Maps multiple times Increase RAM Usage but doesn't reduce it back after navigating back](#15257) </details> - Fix Android map element options retention by @AdamEssenmacher in #35634 <details> <summary>🔧 Fixes</summary> - [[Regression] [Android] [Maps] Map locks up after rendering 50 Polylines](#20502) </details> ## Menubar - [MacCatalyst] Fix KeyboardAccelerator with Cmd+Shift modifiers breaks entire MenuBarItem on Mac Catalyst by @KarthikRajaKalaimani in #35318 <details> <summary>🔧 Fixes</summary> - [[Bug] KeyboardAccelerator with Cmd+Shift modifiers breaks entire MenuBarItem on Mac Catalyst](#35279) </details> ## Navigation - [iOS, Mac] Fix OnBackButtonPressed not invoked for NavigationPage and Shell by @Dhivya-SF4094 in #35072 <details> <summary>🔧 Fixes</summary> - [On Screen Back Button Does Not Fire OnBackButtonPressed in Android](#9095) - [ContentPage's OnBackButtonPressed not invoked on iOS and MacCatalyst](#8296) </details> - Fix Android stale ContainerView root leak by @AdamEssenmacher in #35372 <details> <summary>🔧 Fixes</summary> - [Android: Stale ContainerView retains replaced FlyoutPage graph](#35371) </details> - [Android] Fix for predictive back-to-home animation blocked by unconditional back callback registration by @BagavathiPerumal in #35223 <details> <summary>🔧 Fixes</summary> - [OnBackInvokedCallbacks block back-to-home animation](#34594) - [Migrate to OnBackPressedCallback](#24752) </details> - Revert [Android, iOS] - Flyout icon should remain visible when a page is pushed onto a NavigationPage or Shell page with the back button disabled. by @praveenkumarkarunanithi in #35604 ## Picker - [iOS] Fix Picker CharacterSpacing lost after item selection when Title is set by @SyedAbdulAzeemSF4852 in #34974 <details> <summary>🔧 Fixes</summary> - [[iOS] Picker loses CharacterSpacing after item selection when Title is set](#34971) </details> - [iOS] Fix Picker CharacterSpacing ignored on initial load by @SyedAbdulAzeemSF4852 in #34957 <details> <summary>🔧 Fixes</summary> - [[iOS] Picker ignores CharacterSpacing on initial load](#34955) </details> - [Windows] Fix for Picker CharacterSpacing Not Being Applied to Title and Dropdown Items by @SyedAbdulAzeemSF4852 in #30612 <details> <summary>🔧 Fixes</summary> - [[Windows] Picker CharacterSpacing property not applied to Title and PickerItems text](#30464) </details> - Fix Picker SelectedIndex deferred initialization by @AdamEssenmacher in #35629 <details> <summary>🔧 Fixes</summary> - [Picker Attribute "SelectedIndex" Not being respected on page load on Android?](#9150) </details> ## Progressbar - Fix iOS ProgressBar bounding box by @AdamEssenmacher in #35507 <details> <summary>🔧 Fixes</summary> - [[iOS] ProgressBar and Label don't correctly obey height and width at the core level](#7935) </details> ## RadioButton - [Windows, Android] Fix Border Color and Border Width Not applying for Radio Button by @HarishwaranVijayakumar in #35616 <details> <summary>🔧 Fixes</summary> - [[Windows, Android] Border Color and Border Width Not applying for Radio Button.](#35587) </details> - [inflight/current] Fixes a CS0111 build failure in RadioButton.cs caused by a duplicate OnPropertyChanged override by @HarishwaranVijayakumar in #35631 - Revert - Fix TalkBack not correctly narrating RadioButtons with Content by @devanathan-vaithiyanathan in #35625 <details> <summary>🔧 Fixes</summary> - [[Android] MissingMethodException AccessibilityNodeInfoCompat.set_Checked(bool) on 10.0.70 due to AndroidX.Core 1.17 breaking change](#35584) </details> ## Refreshview - [Windows] Fix RefreshView IsRefreshing property not working while binding by @devanathan-vaithiyanathan in #34845 <details> <summary>🔧 Fixes</summary> - [[Windows] RefreshView IsRefreshing property not working while binding](#30535) </details> - [Android] Fix for RefreshView triggering pull-to-refresh when scrolling inside a WebView with internal scrollable content by @BagavathiPerumal in #34614 <details> <summary>🔧 Fixes</summary> - [[Android] RefreshView triggers pull-to-refresh immediately when scrolling up inside a WebView](#33510) </details> ## SafeArea - [Android] Fix bottom safe area padding dropping to zero when keyboard is shown by @praveenkumarkarunanithi in #35084 <details> <summary>🔧 Fixes</summary> - [[Android] Bottom insets issues when keyboard is shown.](#32871) </details> - Gate SafeArea inset listeners in recycler items by @AdamEssenmacher in #35664 <details> <summary>🔧 Fixes</summary> - [[10.0.60] CollectionView scrolling performance regression](#35344) </details> ## ScrollView - [Windows] Fix COMException when restoring a ScrollView as ContentPage.Content after swapping it out by @Vignesh-SF3580 in #35360 <details> <summary>🔧 Fixes</summary> - [COMException when clone a page's content to a object and set it back later in mainthread on Windows](#35277) </details> - Fix - ScrollView.ScrollToAsync(x, y, animated) doesn't work when called from Page.OnAppearing by @Shalini-Ashokan in #35395 <details> <summary>🔧 Fixes</summary> - [[iOS] ScrollView.ScrollToAsync(x, y, animated) doesn't work when called from Page.OnAppearing](#31177) </details> ## Searchbar - [Android] Fix SearchBar IME full-screen extract mode in landscape orientation by @SubhikshaSf4851 in #35197 <details> <summary>🔧 Fixes</summary> - [[Android] Investigate SearchBar presentation in horizontal screen orientation ](#14708) </details> - [iOS 26] Fix SearchBar layout spacing issues for small HeightRequest values by @devanathan-vaithiyanathan in #35347 <details> <summary>🔧 Fixes</summary> - [Spacing problem with maui 10.0.60 iOS](#35286) </details> ## SearchBar - [Windows] Fix SearchHandler does not focus when ShowSoftInputAsync is called by @praveenkumarkarunanithi in #35079 <details> <summary>🔧 Fixes</summary> - [[Windows] SearchHandler.ShowSoftInputAsync() does not focus the SearchHandler](#34930) </details> ## Shell - Fix Android layout jump when navigating with IME open and NavBarIsVisible=false by @jpd21122012 in #34621 <details> <summary>🔧 Fixes</summary> - [Shell page without NavBar jumping when navigating with keyboard open](#34584) </details> - [Android] Add defensive not null check to SearchHandlerAppearanceTracker.FocusChange by @Transis-Felipe in #29939 - [Android] Fix for Shell colors change before navigation completes on Android in .NET 10 by @BagavathiPerumal in #35295 <details> <summary>🔧 Fixes</summary> - [Shell colors change before navigation completes on Android in .NET 10](#35060) </details> - [Windows] Fix Shell FlyoutItem not taking full width by @SubhikshaSf4851 in #35131 <details> <summary>🔧 Fixes</summary> - [MAUI WinUI Grids don't render properly in flyout menu](#19542) - [[Windows] [.NET 8 RC2] FlyoutItem Backgroundcolor Is not fully displaying](#18238) </details> - [Android, iOS, Catalyst] Fix SearchHandler.BackgroundColor cannot be reset to null by @HarishwaranVijayakumar in #35224 <details> <summary>🔧 Fixes</summary> - [[Android, iOS, Catalyst] SearchHandler.BackgroundColor cannot be reset to null](#35088) </details> - Fix for ApplyQueryAttributes being called on non-destination pages during back navigation by @BagavathiPerumal in #35392 <details> <summary>🔧 Fixes</summary> - [ApplyQueryAttributes gets called for not activated (navigated to) page on back](#35183) </details> - [Android] Fix Shell flyout background to follow Material 3 theme colors by @SyedAbdulAzeemSF4852 in #35148 <details> <summary>🔧 Fixes</summary> - [[Android] Shell Flyout ignores Material 3 surface color when UseMaterial3 is enabled](#35147) </details> - [Android] Fix Shell.FlyoutHeader background incorrect by @SyedAbdulAzeemSF4852 in #35489 <details> <summary>🔧 Fixes</summary> - [[Android] Shell.FlyoutHeader background is incorrect](#35416) </details> - [iOS/MacCatalyst] Fix Shell.BackgroundColor not applied to bottom TabBar by @Shalini-Ashokan in #35545 <details> <summary>🔧 Fixes</summary> - [[MacCatalyst] Shell.BackgroundColor not applied to bottom TabBar](#35380) - [[Catalyst] Shell.TabBarBackgroundColor is not applied](#35381) </details> - [Android] Fix Shell FlyoutIcon tint loss after navigation by @SyedAbdulAzeemSF4852 in #35561 <details> <summary>🔧 Fixes</summary> - [[Android] The flyout icon loses colours](#35390) </details> - [iOS] Fix Shell - opened keyboard on modal page shifts parent page/frame behind modal after update to 10.0.60 by @KarthikRajaKalaimani in #35559 <details> <summary>🔧 Fixes</summary> - [[iOS] Shell - opened keyboard on modal page shifts parent page/frame behind modal after update to 10.0.60](#35401) </details> - Fix intermediate pages not receiving query parameters in multi-page Shell navigation by @mattleibow in #35432 <details> <summary>🔧 Fixes</summary> - [Shell GoToAsync: no way to pass query parameters to intermediate pages in multi-segment navigation](#35107) </details> - [Windows] Fix Shell title bar overlap with window controls in RTL mode by @Shalini-Ashokan in #33109 <details> <summary>🔧 Fixes</summary> - [[Windows] Binding RTL FlowDirection in Shell causes Flyout MenuIcon and native window controls to overlap](#32476) </details> - [macOS] Fix IsEnabled property false not working on MenuBarItem by @devanathan-vaithiyanathan in #35546 <details> <summary>🔧 Fixes</summary> - [[macOS] IsEnabled property false not working on MenuBarItem](#34038) </details> - Fix Android Shell top inset when nav bar is hidden by @ne0rrmatrix in #35555 <details> <summary>🔧 Fixes</summary> - [wrong statusbar height when Android device has a notch](#35103) </details> - Fix Changing Content property of ShellContent doesn't change visual content by @devanathan-vaithiyanathan in #34630 <details> <summary>🔧 Fixes</summary> - [Changing Content property of ShellContent doesn't change visual content. ](#12669) </details> - Fixed a NullReferenceException when starting application with empty shell on Windows by @Shalini-Ashokan in #28879 <details> <summary>🔧 Fixes</summary> - [NullReferenceException when starting application with empty shell on Windows](#21562) - [Using SelectionChangedCommand with CollectionView in Shell.FlyoutContent results in Win32 Unhandled Exception](#10041) </details> ## Slider - [iOS] Slider: Scale ThumbImageSource to match default thumb size by @NirmalKumarYuvaraj in #34184 <details> <summary>🔧 Fixes</summary> - [[Slider] MAUI Slider thumb image is big on android](#13258) </details> ## Stepper - Fix iOS 26 Stepper overlap in landscape by @AdamEssenmacher in #35374 <details> <summary>🔧 Fixes</summary> - [[.NET10] D10-The number and buttons overlap after rotating the simulator.](#35211) </details> ## SwipeView - Fix SwipeViews with invoked properties crash the app in Release mode by @BagavathiPerumal in #35208 <details> <summary>🔧 Fixes</summary> - [[iOS/Catalyst] Swipeviews with invoked properties crash the app in Release](#18055) </details> - Fix SwipeItemView command leak by @AdamEssenmacher in #35510 <details> <summary>🔧 Fixes</summary> - [`SwipeItemView.Command` leaks row views and command parameters through `CanExecuteChanged`](#35498) </details> - [iOS/Android] Fix SwipeItem.IsVisible not refreshing native swipe items when binding changes by @SyedAbdulAzeemSF4852 in #35217 <details> <summary>🔧 Fixes</summary> - [SwipeItem.IsVisible doesn't properly refresh the native swipe items when the binding value changes dynamically](#34832) </details> - Fix SwipeView memory leak when SwipeItems are reused or replaced by @Vignesh-SF3580 in #35539 <details> <summary>🔧 Fixes</summary> - [SwipeView leaks when SwipeItems are reused or replaced](#35481) </details> - Fix SwipeItem IconImageSource color handling and rendering across platforms by @Shalini-Ashokan in #35632 <details> <summary>🔧 Fixes</summary> - [[Android] SwipeItem IconImageSource should allow more configuration](#23074) </details> ## Switch - [Android/Windows] Fix RadioButton gradient not clearing when switching background by @Shalini-Ashokan in #34997 <details> <summary>🔧 Fixes</summary> - [RadioButton Background does not reset when set to null at runtime](#34993) </details> - [Windows] Fix "PlatformView cannot be null here" exception during handler disconnect by @kubaflo in #35314 <details> <summary>🔧 Fixes</summary> - ["PlatformView cannot be null here" Exception in Switch control [Windows]](#27101) </details> - [iOS 26] Fix Switch ThumbColor and OffColor not applied on initial load by @SyedAbdulAzeemSF4852 in #35400 <details> <summary>🔧 Fixes</summary> - [iOS 26 Switch default color for Off and On is incorrect + Off Color is not applied at start + Thumb Colors is not applied](#35257) </details> - [Android] Fix AppBar flicker on CheckBox/Switch toggle with Material 3 by @Dhivya-SF4094 in #35181 <details> <summary>🔧 Fixes</summary> - [[Android] AppBar flicker while changing the CheckBox or Switch state after scrolling in Material 3](#35180) </details> - [Android] Fix Switch Shadow Does Not Follow Thumb when Toggle On or Off by @Dhivya-SF4094 in #35623 <details> <summary>🔧 Fixes</summary> - [[Android] Switch Shadow Does Not Follow Thumb when Toggle On or Off](#30046) </details> ## TabbedPage - [Android] Fix TabbedPage truncating tab titles instead of scrolling by @Shalini-Ashokan in #35086 <details> <summary>🔧 Fixes</summary> - [Maui migrating Xamarin to Maui - Tabbed Page Scroll Issue - Tabs are not scrolling](#16470) </details> - [Android] Fix BottomNavigationView remaining visible for TabbedPage inside modal NavigationPage after PushAsync by @Dhivya-SF4094 in #35359 <details> <summary>🔧 Fixes</summary> - [Android TabbedPage inside Modal Navigation does not overlay BottomNavigationView after PushAsync in .NET MAUI 10.0.60](#35331) </details> - [Android & iOS] TabbedPage leaks with shared GradientBrush. by @SubhikshaSf4851 in #35543 <details> <summary>🔧 Fixes</summary> - [TabbedPage leaks renderer/manager when BarBackground uses shared GradientBrush resource](#35469) </details> ## Templates - Bumps Syncfusion.Maui.Toolkit dependency to version 1.0.10 by @PaulAndersonS in #35608 ## Toolbar - Fix Android app bar inset background coloring by @ne0rrmatrix in #35601 <details> <summary>🔧 Fixes</summary> - [Android Edge-to-Edge: Shell and NavigationPage Top Bar colour is not used for status bar.](#35568) </details> ## Tooling - Add default .gitignore to MAUI project templates by @davidortinau in #34862 <details> <summary>🔧 Fixes</summary> - [Add a gitignore file to the Maui template in VS 2022](#4131) </details> - Fix: Propagate AdditionalProperties from ProjectReference in ResizetizeCollectItems by @mattleibow in #35575 <details> <summary>🔧 Fixes</summary> - [Resizetizer GetMauiItems does not propagate ProjectReference AdditionalProperties](#35574) </details> ## WebView - [Windows] Fix WebView blank rendering when used with HybridWebView by @SubhikshaSf4851 in #35092 <details> <summary>🔧 Fixes</summary> - [[Windows] WebView Regression from NET9 to NET10](#34558) </details> - Fix AOT integration test failures: suppress IL3050/IL2026 for HybridWebViewHandler in AddControlsHandlers by @mattleibow via @Copilot in #34868 - Fix Android activity result callback leak by @AdamEssenmacher in #35436 <details> <summary>🔧 Fixes</summary> - [Android WebView file chooser callbacks leak via ActivityResultCallbackRegistry](#35405) </details> - [Windows] Fix WebView Does Not Inherit App Theme by @devanathan-vaithiyanathan in #35037 <details> <summary>🔧 Fixes</summary> - [WebView on Windows Does Not Inherit App Theme](#34823) </details> - Fix for WebView leaks when reusing a shared WebViewSource by @BagavathiPerumal in #35524 <details> <summary>🔧 Fixes</summary> - [WebView leaks when reusing a shared WebViewSource](#35483) </details> - Destroy Android WebView on handler disconnect by @AdamEssenmacher in #35552 <details> <summary>🔧 Fixes</summary> - [Right way to dispose page with WebView](#18021) </details> ## Xaml - Fix: Enable VisualStateManager to set Style property dynamically by @Shalini-Ashokan in #33389 <details> <summary>🔧 Fixes</summary> - [Setting the `Style` property using the `VisualStateManager` within a Style resource does not work](#17175) </details> - Fix Implicit parameter conversion from integer to byte fails with source generated XAML by @KarthikRajaKalaimani in #35444 <details> <summary>🔧 Fixes</summary> - [Implicit parameter conversion from integer to byte fails with source generated XAML](#35396) </details> <details> <summary>🔧 Infrastructure (3)</summary> - Fix: Build fails when appicon is an empty (but valid) SVG by @Shalini-Ashokan in #35305 <details> <summary>🔧 Fixes</summary> - [Build fails when appicon is an empty (but valid) svg after upgrade to 10.0.60](#35293) </details> - [inflight/current] Fix CS0111 duplicate GetNativeCharacterSpacing in PickerHandlerTests.iOS by @SyedAbdulAzeemSF4852 in #35419 - Update WinAppSDK to 1.8.260508005 by @kubaflo in #35678 </details> <details> <summary>🧪 Testing (3)</summary> - Backport Test Fixes and Snapshots from SR to Inflight Branch by @Tamilarasan-Paranthaman in #35499 - Fix hardcoded version of Microsoft.DotNet.XHarness.TestRunners.Xunit in test projects by @akoeplinger in #29905 - [Testing] Fixed Build error on inflight/ candidate PR 35716 by @HarishKumarSF4517 in #35730 </details> <details> <summary>🏠 Housekeeping (1)</summary> - [HouseKeeping] Fix inconsistant namespace in HostApp by @NirmalKumarYuvaraj in #35210 </details> <details> <summary>📦 Other (8)</summary> - Add .cab and ReconnectModal.razor.js to signing config by @jesuszarate in #35026 - Fix typo in Clipboard.shared.cs by @Deadpikle in #35316 - Fix single modifier for NSMenuItem accelerators by @jeremy-visionaid in #35351 - Avoid unnecessary LINQ enumerations by @jeremy-visionaid in #35272 - [Testing] Replace retryDelay with retryTimeout in UI tests by @kubaflo in #35367 - Replace JavaFinalize() with Dispose(bool) in GenericAnimatorListener by @jonathanpeppers in #35548 - Fix incorrect SDK provisioning commands in integration-tests instructions by @davidnguyen-tech in #34992 - Fix VisualElement.ChangeVisualState() gets stuck in Selected state by @Dhivya-SF4094 in #35421 <details> <summary>🔧 Fixes</summary> - [VisualElement's ChangeVisualState gets stuck in Selected state](#35399) </details> </details> <details> <summary>📝 Issue References</summary> Fixes #4131, Fixes #4715, Fixes #5947, Fixes #7150, Fixes #7814, Fixes #7935, Fixes #8296, Fixes #9095, Fixes #9150, Fixes #10041, Fixes #12669, Fixes #13258, Fixes #14708, Fixes #15257, Fixes #16470, Fixes #17175, Fixes #17554, Fixes #17698, Fixes #18021, Fixes #18055, Fixes #18238, Fixes #19542, Fixes #19668, Fixes #20502, Fixes #20615, Fixes #21562, Fixes #22053, Fixes #23074, Fixes #24752, Fixes #27101, Fixes #27627, Fixes #27770, Fixes #27922, Fixes #28514, Fixes #28676, Fixes #28891, Fixes #29411, Fixes #29449, Fixes #30010, Fixes #30046, Fixes #30404, Fixes #30464, Fixes #30535, Fixes #30957, Fixes #31048, Fixes #31177, Fixes #31472, Fixes #31686, Fixes #32279, Fixes #32393, Fixes #32404, Fixes #32457, Fixes #32476, Fixes #32492, Fixes #32731, Fixes #32871, Fixes #33508, Fixes #33510, Fixes #33780, Fixes #34038, Fixes #34104, Fixes #34257, Fixes #34380, Fixes #34522, Fixes #34558, Fixes #34584, Fixes #34594, Fixes #34823, Fixes #34830, Fixes #34832, Fixes #34899, Fixes #34930, Fixes #34955, Fixes #34971, Fixes #34973, Fixes #34993, Fixes #35060, Fixes #35076, Fixes #35088, Fixes #35103, Fixes #35107, Fixes #35113, Fixes #35114, Fixes #35147, Fixes #35180, Fixes #35183, Fixes #35211, Fixes #35214, Fixes #35244, Fixes #35257, Fixes #35277, Fixes #35279, Fixes #35280, Fixes #35286, Fixes #35293, Fixes #35313, Fixes #35326, Fixes #35331, Fixes #35344, Fixes #35354, Fixes #35371, Fixes #35380, Fixes #35381, Fixes #35387, Fixes #35390, Fixes #35396, Fixes #35397, Fixes #35399, Fixes #35401, Fixes #35405, Fixes #35416, Fixes #35429, Fixes #35469, Fixes #35472, Fixes #35473, Fixes #35479, Fixes #35481, Fixes #35483, Fixes #35485, Fixes #35492, Fixes #35495, Fixes #35497, Fixes #35498, Fixes #35513, Fixes #35517, Fixes #35568, Fixes #35573, Fixes #35574, Fixes #35584, Fixes #35587, Fixes #35615, Fixes #35618, Fixes #35651, Fixes #35654 </details> **Full Changelog**: main...inflight/candidate
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Issue details
The predictive back-to-home animation on Android does not play when a
BlazorWebViewis present on screen. On Android 16, swiping back from the root page skips the animation instead of showing the smooth system transition.Root Cause
The issue occurs because BlazorWebViewHandler registers an IOnBackInvokedCallback unconditionally on API 33+, regardless of whether the WebView contains back navigation history. As a result, the callback remains continuously active, preventing the Android system from recognizing when no further back navigation is available, which in turn blocks the predictive back-to-home animation from being triggered.
Description of Change
The fix involves replacing the legacy IOnBackInvokedCallback and AndroidLifecycle.OnBackPressed handling with a unified AndroidX.Activity.OnBackPressedCallback, where the Enabled property serves as the single source of truth for back navigation handling. When the WebView has no navigation history, the callback is disabled (Enabled = false), allowing the Android system to process the back gesture normally and display the predictive back-to-home animation.
To ensure the callback state remains accurate, UpdateBackNavigationState() is invoked after every navigation event from both OnPageFinished and DoUpdateVisitedHistory, covering standard page navigations as well as Blazor SPA route changes. Additionally, a fallback mechanism in HandleOnBackPressed() sets Enabled = false when the WebView is detached or not focused, ensuring the back gesture is correctly delegated to the next available system handler.
Why Tests were not added:
Regarding the test case: This issue is specific to Android 16 (API 36), while the current automated device test coverage does not reliably reproduce this exact platform behavior in CI. Because of that limitation, a deterministic automated repro test could not be added at this time. Validation was performed through manual Android 16 scenario testing focused on root-page predictive back and navigated-page back handling.
Tested the behavior in the following platforms.
Issues Fixed
Fixes #35397
Output
35397-BeforeFix.BlazorWebView.mov
35397-AfterFix.BlazorWebView.mov