Registering a class instance that is dependent on the MainActivity

[MartinRobins]

On Android, Xamarin Forms was supported (is that really the right word) by the FormsAppCompatActivity and in my XF application I have an enhanced FormsAppCompatActivity that provides access to the barcode scanning hardware on Zebra scanners (via their EMDK), the implementation of this being dependent on a number of events and properties of the Activity.

I am able to then register the activity as an implementation of an interface using the IPlatformInitializer callback.

With MAUI, the application is now the base (MauiApplication) and at the time that CreateMauiApp is created the activity does not appear to exist - in fact, it seems to be being created some time later in the process.

I still need to use that functionality in my MAUI application and would like some suggestion as to how and when I can register the instance into the IContainerRegistry? I have already recreated the IPlatformInitializer interface and implemented it for the MauiApplication as I have to have different implementations for different devices and as such have different projects to generate the device specific outputs (despite them all being Android, the hardware is different on each device and I am interacting specifically with that hardware along with needing to intercept keyboard events (OnKeyDown/OnKeyUp).

I guess what I am asking here is how I can register the instance of the MainActivity into the IContainerRegistry once it has been created (which of course is after the MauiAppBuilder.Build and PrismAppBuilder.RegisterTypes have been called).

Thoughts?

[MartinRobins]

I have a work around; though it feels dirty (so still looking for better ideas)...

In my MainApplication (MauiApplication)...

• I have an IPlatformInitializer callback already; within this, I save the instance of the IContainerRegistry provided by the PrismAppBuilder.RegisterTypes method.
• I have implemented IActivityLifecycleCallbacks, and within my OnActivityCreated I use the saved IContainerRegistry to then register the Activity instance.

It is of course dependent on my not trying to use the functionality within the MauiApplication before the Activity is created!

M.