How to call Mono for Android class from within Android application?

If I'm understanding correctly what you're trying to do, this isn't really possible. As the error message you got implies, an Activity within a Mono for Android application relies on the Mono runtime in order to function properly. The callable wrapper isn't useful on its own in this case, since it's just a thin Java wrapper class that calls into the Mono runtime.

You can actually see the generated callable wrappers yourself if you look in the obj/Debug/android/src folder after you build your project. For example.

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