TabbedPage running on Android Emulator - Unhandled Exception

[Cywizz]

Description

I am getting a System.NullReferenceException using a TabbedPage on the Android Emulator.
Windows Machine works fine.
First time using TabbedPage in MAUI so not sure if or in which version this worked before.

Steps to Reproduce

1.Create a new .Net MAUI app
2. Change the MainPage.xaml from ContentPage to TabbedPage
3. Wrap the template's ScrollView in a ContentPage
4. Change MainPage class to inherit from TabbedPage
5. Run using Android Emulator (I used Pixel 5 - API 30(Android 11)
6. Unhandled Exception thrown

Version with bug

Release Candidate 1 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 11 - API 30

Did you find any workaround?

No

Relevant log output

System.NullReferenceException: 'Object reference not set to an instance of an object.'

[XamlTest]

Verified this issue with Visual Studio Enterprise 17.3.0 Preview 1.0 [32414.199.main]. Repro on Android, not repro on Windows. Sample Project: 6349.zip

[jsuarezruiz]

Thread started: <Thread Pool> #6
Thread started: .NET ThreadPool Gate #7
[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object.
[mono-rt]    at Microsoft.Maui.Controls.Handlers.TabbedPageManager.SetTabLayout() in D:\a\_work\1\s\src\Controls\src\Core\Platform\Android\TabbedPageManager.cs:line 238
[mono-rt]    at Microsoft.Maui.Controls.Handlers.TabbedPageManager.SetElement(TabbedPage tabbedPage) in D:\a\_work\1\s\src\Controls\src\Core\Platform\Android\TabbedPageManager.cs:line 160
[mono-rt]    at Microsoft.Maui.Controls.TabbedPage.CreatePlatformView() in D:\a\_work\1\s\src\Controls\src\Core\HandlerImpl\TabbedPage\TabbedPage.Android.cs:line 23
[mono-rt]    at Microsoft.Maui.Controls.TabbedPage.OnCreatePlatformView(ViewHandler`2 arg) in D:\a\_work\1\s\src\Controls\src\Core\HandlerImpl\TabbedPage\TabbedPage.Android.cs:line 30
[mono-rt]    at Microsoft.Maui.Handlers.ViewHandler`2[[Microsoft.Maui.ITabbedView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Android.Views.View, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].OnCreatePlatformView() in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:line 72
[mono-rt]    at Microsoft.Maui.Handlers.ViewHandler.OnCreatePlatformElement() in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandler.cs:line 121
[mono-rt]    at Microsoft.Maui.Handlers.ElementHandler.CreatePlatformElement() in D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:line 96
[mono-rt]    at Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(IElement view) in D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:line 52
[mono-rt]    at Microsoft.Maui.Handlers.ViewHandler.SetVirtualView(IElement element) in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandler.cs:line 127
[mono-rt]    at Microsoft.Maui.Handlers.ViewHandler`2[[Microsoft.Maui.ITabbedView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Android.Views.View, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].SetVirtualView(IView view) in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:line 53
[mono-rt]    at Microsoft.Maui.Handlers.ViewHandler`2[[Microsoft.Maui.ITabbedView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Android.Views.View, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].SetVirtualView(IElement view) in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:line 56
[mono-rt]    at Microsoft.Maui.Controls.Element.SetHandler(IElementHandler newHandler) in D:\a\_work\1\s\src\Controls\src\Core\HandlerImpl\Element\Element.Impl.cs:line 64
[mono-rt]    at Microsoft.Maui.Controls.Element.set_Handler(IElementHandler value) in D:\a\_work\1\s\src\Controls\src\Core\HandlerImpl\Element\Element.Impl.cs:line 20
[mono-rt]    at Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler(IElementHandler value) in D:\a\_work\1\s\src\Controls\src\Core\HandlerImpl\VisualElement\VisualElement.Impl.cs:line 295
[mono-rt]    at Microsoft.Maui.Platform.ElementExtensions.ToHandler(IElement view, IMauiContext context) in D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 96
[mono-rt]    at Microsoft.Maui.Platform.ViewExtensions.ToHandler(IView view, IMauiContext context) in D:\a\_work\1\s\src\Core\src\Platform\ViewExtensions.cs:line 44
[mono-rt]    at Microsoft.Maui.Controls.Platform.Compatibility.ShellFragmentContainer.OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) in D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Shell\Android\ShellFragmentContainer.cs:line 41
[mono-rt]    at AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_inflater, IntPtr native_container, IntPtr native_savedInstanceState) in C:\a\_work\1\s\generated\androidx.fragment.fragment\obj\Release
et6.0-android\generated\src\AndroidX.Fragment.App.Fragment.cs:line 1999

[PureWeen]

#6389