Android OnRedraw exception - not on the UI thread

[johncdoherty]

I am receiving the following error on Android fromLiteHtmlMaui.Handlers.AndroidLiteHtmlView.OnRedraw() in a .NET9 MAUI application when attempting to utilize the LiteHtml.MAUI from within a collection view. This results in an application crash, instability, and/or rendering issues in other pages. I believe the AndroidLiteHtmlView.OnRedraw() should be implemented in the same fashion as it is on iOS, usingInvokeOnMainThread.

Exception: AggregateException
Message: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Only the original thread that created a view hierarchy can touch its views. Expected: main Calling: Thread-13)
Stack Trace: 
Inner Exception: AndroidRuntimeException
Inner Message: **Only the original thread that created a view hierarchy can touch its views. Expected: main** Calling: Thread-13
Inner Stack Trace:    at Java.Interop.JniEnvironment.InstanceMethods.CallNonvirtualVoidMethod(JniObjectReference instance, JniObjectReference type, JniMethodInfo method, JniArgumentValue* args) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/obj/Release/net8.0/JniEnvironment.g.cs:line 20831
   at Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeVirtualVoidMethod(String encodedMember, IJavaPeerable self, JniArgumentValue* parameters) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:line 75
   at Android.Views.View.RequestLayout() in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net9.0/android-35/mcw/Android.Views.View.cs:line 21496
   at **LiteHtmlMaui.Handlers.AndroidLiteHtmlView.OnRedraw()**
   at LiteHtmlMaui.Handlers.Native.LiteHtmlDocumentView`3.<>c__DisplayClass20_0.<<LoadImageCb>b__0>d[[Android.Graphics.Canvas, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065],[Android.Graphics.Bitmap, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065],[Android.Graphics.Typeface, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].MoveNext()

Usage:

<CollectionView ItemsSource="{Binding GuideData}" x:Name="GuideDataCollectionView">
	<CollectionView.ItemTemplate>
		<DataTemplate x:DataType="scg:KeyValuePair(sys:String,sys:String)">
			<VerticalStackLayout Spacing="2" Margin="0,8,0,8">
				<Label Text="{Binding Key}" Style="{StaticResource SubTitleLabel}" />
				<html:LiteHtml Html="{Binding Value}" TextColor="{AppThemeBinding Light={StaticResource LightColorText1}, Dark={StaticResource DarkColorText1}}"/>
			</VerticalStackLayout>
		</DataTemplate>
	</CollectionView.ItemTemplate>
</CollectionView>