[Bug] MissingMethodException: AccessibilityNodeInfoCompat.set_Checked with AndroidX.Core 1.17.0

[RaFaGG]

Current behavior

On Android, when the UnoSKCanvasView receives an accessibility focus change, a MissingMethodException is thrown:

System.MissingMethodException: Method not found: void AndroidX.Core.View.Accessibility.AccessibilityNodeInfoCompat.set_Checked(bool)

   at void UnoSKCanvasView.OnFocusChanged(bool gainFocus, FocusSearchDirection direction, Rect previouslyFocusedRect)
   at void ExploreByTouchHelper.OnFocusChanged(bool, int, Rect)
   at void ExploreByTouchHelper.n_OnPopulateNodeForVirtualView_ILandroidx_core_view_accessibility_AccessibilityNodeInfoCompat_(IntPtr, IntPtr, int, IntPtr)

The error is caught and logged (non-crashing), but accessibility for toggle/check state is broken.

Expected behavior

No exception. The accessibility node should correctly report checked state.

How to reproduce

1. Use Uno Platform with SkiaRenderer on Android
2. Have a dependency that pulls in Xamarin.AndroidX.Core >= 1.17.0 (e.g., Sentry >= 6.2.0 with Sentry.Bindings.Android for net10.0-android36.0)
3. Navigate to any page and trigger accessibility focus on the canvas view

Root cause

In UnoExploreByTouchHelper.cs line ~211, the code uses:

node.Checked = peer is IToggleProvider toggleProvider && toggleProvider.ToggleState == On;

Xamarin.AndroidX.Core 1.17.0 renamed the Checked property to IsChecked on AccessibilityNodeInfoCompat, so set_Checked(bool) no longer exists at runtime.

Suggested fix

Replace node.Checked with node.IsChecked in UnoExploreByTouchHelper.cs.

Environment

• Uno.Sdk: 6.5.31 (also affects 6.6.0-dev.180, file unchanged since July 2025)
• .NET: 10.0
• Target: net10.0-android36.0
• Xamarin.AndroidX.Core: 1.17.0 (pulled by Sentry.Bindings.Android 6.3.0)
• Device: Samsung SM-S947B, Android 16 (API 36)
• Affected users: 9 (18 occurrences in Sentry)

[JeremyBP]

Same here and Google keep rejecting aab while publishing because of ANR and crashes due to this exception !

The root cause is not a rename but a binary breaking change in AndroidX Core.

In Xamarin.AndroidX.Core ≥ 1.17 binding package, some methods changed their return type from boolean to int, following java changes. However, Uno.UI.Runtime.Skia.Android currently depends (via Xamarin.AndroidX.AppCompat) on Core 1.16.x.

This creates a runtime signature mismatch:

• Uno is compiled against boolean
• runtime may provide int
  → leading to MissingMethodException

Possible approaches

1. Upgrade AndroidX dependencies in Uno Directory.Build.targets (preferred clean fix)

   • Move to AppCompat ≥ 1.7.1.2 (instead of current 1.7.0.7)
   • Update Uno code to use new AndroidX signatures
   • No backward compatibility, but clean and future-proof

2. Add runtime compatibility layer

   • Handle both signatures dynamically (e.g., reflection)
   • Normalize int → bool
   • Keeps compatibility with both 1.16 and 1.17+

3. Force dependency alignment (workaround)

   • Pin all AndroidX packages to 1.16.x
   • Avoids the issue but blocks upgrades

This cannot be solved reliably with compile-time changes only, as the issue is ABI-level, not just API-level.