[feat] Android plugins should be able to call our own MainActivity functions

[NyaomiDEV]

Describe the problem

I am writing this app here and I wanted to implement a Splash Screen retention mechanism using the Android 12 API.

https://developer.android.com/develop/ui/views/launch/splash-screen#suspend-drawing

Thing is, plugins get initialized way after TauriActivity.onCreate() gets called, so I cannot put a stop on frame drawing from within the plugin; I have to do it in my MainActivity.

The second problem I face, then, is that there's no way to perform a Kotlin-to-Kotlin call, even if I do have the Activity object, because from my plugin there's no way to import MainActivity.

Describe the solution you'd like

There should be some kind of way to register native plugins early, so that we can manipulate the Activity before the WebView gets mounted.

Alternatives considered

Event passing, Kotlin reflection, or telling Gradle to import my entire application as a dependency. I am not knowledgeable enough, probably.

Additional context

No response

[NyaomiDEV]

For now I declared a singleton on the plugin which holds my OnPreDrawListener callback. I then register it from MainActivity.onCreate() and unregister it through a command.

NyaomiDEV/Ampersand@93fa3ce