[BUG] TouchBehavior fails with MethodAccessException when using MAUI 9.0.40

[tranb3r]

Is there an existing issue for this?

• I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

• I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

TouchBehavior throws a System.MethodAccessException at runtime when running against the latest dotnet/maui (9.0.40).

Probably because TouchBehavior.android.cs calls the internal method Microsoft.Maui.Platform.ViewExtensions.GetParentOfType<T>(), but dotnet/maui removed the InternalsVisibleTo attribute for CommunityToolkit assemblies in PR dotnet/maui#33442.

Expected Behavior

No runtime exception.

Stack trace

[System.MethodAccessException]: Method `Microsoft.Maui.Platform.ViewExtensions.GetParentOfType[Android.Views.ViewGroup](Android.Views.View)' is inaccessible from method `CommunityToolkit.Maui.Behaviors.TouchBehavior.OnAttachedTo(Microsoft.Maui.Controls.VisualElement,Android.Views.View)'
 	at CommunityToolkit.Maui.Behaviors.TouchBehavior.OnAttachedTo + 0x16(Unknown Source)
 	at Microsoft.Maui.Controls.PlatformBehavior`2[[Microsoft.Maui.Controls.VisualElement, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null],[Android.Views.View, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].OnLoaded + 0x37(Unknown Source)

Environment

- .NET MAUI CommunityToolkit: 14.0.0
- OS: android
- .NET MAUI: 10.0.40-ci.main.26111.16

[tranb3r]

Also seeing this one:

[System.MethodAccessException]: Method `Microsoft.Maui.JavaObjectExtensions.IsAlive(Java.Lang.Object)' is inaccessible from method `CommunityToolkit.Maui.Behaviors.TouchBehavior.UpdateClickHandler()'

[VladislavAntonyuk]

We don't support preview versions. We'll get a compilation error if we use inaccessible method.

[airtaxi]

This happens even with official MAUI 10.0.40 and CommunityToolkit.MAUI 14.0.0

[airtaxi]

Workaround: Downgrading MAUI version to 10.0.31 works with CommunityToolkit.MAUI version 14.0.0 (13.0.0 with 10.0.40 still crashes the Android application)

[tranb3r]

Closing this issue just a few hours before the release was probably not the smartest thing to do...
@VladislavAntonyuk Could you please reopen this issue?

[StephanArnas]

Hello,
I can confirm that we are experiencing the same issue on our side as well.
I’m available to help if a reproduction example is needed.

System.MethodAccessException: Method `Microsoft.Maui.Platform.ViewExtensions.GetParentOfType[Android.Views.ViewGroup](Android.Views.View)' is inaccessible from method `CommunityToolkit.Maui.Behaviors.TouchBehavior.OnAttachedTo(Microsoft.Maui.Controls.VisualElement,Android.Views.View)'
   at CommunityToolkit.Maui.Behaviors.TouchBehavior.OnAttachedTo(VisualElement bindable, View platformView) in /_/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/Touch/TouchBehavior.android.cs:line 44
   at Microsoft.Maui.Controls.PlatformBehavior`2[[Microsoft.Maui.Controls.VisualElement, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null],[Android.Views.View, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].OnLoaded(Object sender, EventArgs e) in /_/src/Controls/src/Core/Interactivity/PlatformBehavior.cs:line 107
   at Microsoft.Maui.Controls.VisualElement.SendLoaded(Boolean updateWiring) in /_/src/Controls/src/Core/VisualElement/VisualElement.cs:line 2362
   at Microsoft.Maui.Controls.VisualElement.SendLoaded() in /_/src/Controls/src/Core/VisualElement/VisualElement.cs:line 2355
   at Microsoft.Maui.Platform.ViewExtensions.<>c__DisplayClass44_0.<OnLoaded>b__2(Object _, ViewAttachedToWindowEventArgs __) in /_/src/Core/src/Platform/Android/ViewExtensions.cs:line 600
   at Android.Views.View.IOnAttachStateChangeListenerImplementor.OnViewAttachedToWindow(View attachedView)
   at Android.Views.View.IOnAttachStateChangeListenerInvoker.n_OnViewAttachedToWindow_Landroid_view_View_(IntPtr jnienv, IntPtr native__this, IntPtr native_attachedView)

[TheCodeTraveler]

This appears to be a breaking change in the latest version of .NET / .NET MAUI.

I'm looking into it now.

Related Isues:

• [BUG] snackbar.Show fails on Microsoft.Maui.Controls Version="10.0.40" #3093
• [BUG] AppThemeObject<T>.GetBinding calls inaccessible method #3092
• [BUG] TouchBehavior fails with MethodAccessException when using MAUI 9.0.40 #3089