Invalid [Register] for nested default interface method invokers

[VladislavAntonyuk]

Steps to Reproduce

1. Create default Xamarin Forms app
2. Set TargetFramework to 10.0.0.99 and sdk to 30
3. run app

System.TypeLoadException: 'Could not load type 'Android.App.Application.IActivityLifecycleCallbacks' from assembly 'Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.'

[jpobst]

Thanks for the report! We were just in the middle of trying to track this down. Turns out it's a generator bug, so moving this to Java.Interop repo.

[jpobst]

The issue is that when we [Register] the invoker for a default method in a nested class, we are using . to denote a nested class, when it should be a /.

For example, in:

[Register ("onActivityPostCreated", "(Landroid/app/Activity;Landroid/os/Bundle;)V", "GetOnActivityPostCreated_Landroid_app_Activity_Landroid_os_Bundle_Handler:Android.App.Application.IActivityLifecycleCallbacks, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null", ApiSince = 29)]

Android.App.Application.IActivityLifecycleCallbacks should be Android.App.Application/IActivityLifecycleCallbacks.

This is causing the nested type to not be found.

[jpobst]

The fix for this should be in VS2019 16.7 Preview 4.

[brendanzagaeski]

Release status update

A new Preview version of Xamarin.Android has now been published that includes the fix for this item. The fix is not yet included in a Release version. I will update this again when a Release version is available that includes the fix.

Fix included in Xamarin.Android 11.0.0.3.

Fix included on Windows in Visual Studio 2019 version 16.7 Preview 4. To try the Preview version that includes the fix, check for the latest updates in Visual Studio Preview.

Fix included on macOS in Visual Studio 2019 for Mac version 8.7 Preview 4. To try the Preview version that includes the fix, check for the latest updates on the Preview updater channel.

[brendanzagaeski]

Release status update

A new Release version of Xamarin.Android has now been published that includes the fix for this issue.

Fix included in Xamarin.Android SDK version 11.0.0.3.

Fix included on Windows in Visual Studio 2019 version 16.7. To get the new version that includes the fix, check for the latest updates or install the most recent release from https://visualstudio.microsoft.com/downloads/.

Fix included on macOS in Visual Studio 2019 for Mac version 8.7. To get the new version that includes the fix, check for the latest updates on the Stable updater channel.