Hi everyone, I'm working on my KMP project and I'v...

# multiplatform

[Paolo Pasianot]

Hi everyone,
I'm working on my KMP project and I've run into an issue with initializing classes via Koin when they have different constructor requirements based on the platform.
For example, imagine I have a class that needs an Android Context in its constructor for the Android target, but obviously not for the iOS target.
How can I inject the same object (defined by an interface) using Koin, while delegating the actual implementation and its specific constructor dependencies to each individual platform (Android and iOS)?
Thanks

[Olivier Patry]

Maybe you can follow the pattern used by Room.
On Android you need to provide a context, not for desktop for instance.

[Olivier Patry]

(not for iOS either obviously)

[QWQ]

I typically implement one of these two solutions:
1. Declare a singleton or static variable to store the current context. Instead of passing the context around, directly access it via this variable when needed.
2. Define an interface class in commonMain, then have androidMain, iosMain, or even Swift code in iosApp implement it separately, and pass the implementation to Kotlin for invocation.

[Vidmantas Kerbelis]

This is more of a #C67HDJZ2N question as far as I see.
Specifically with Koin, you can create an expect/actual module that creates said interface:

commonMain:
expect fun createPlatformModule(): Module

androidMain:
actual fun createPlatformModule(): Module = module {
    single<Foo> { AndroidFoo(context = get()) }
}

iosMain:
actual fun createPlatformModule(): Module = module {
    single<Foo> { IosFoo() }
}

Dont' forget to pass the androidContext in startKoin on the Android's side.

startKoin {
    androidContext(...)
}

If you have startKoin in a shared place, expose a lambda KoinApplication.() -> Unit to be able to add additional modules for a specific platform.

fun initialize(action: KoinApplication.() -> Unit) {
    startKoin {
        action()
        modules(
            listOf(createPlatformModule(), ...)
        )
    }
}

[Paolo Pasianot]

Ohh thanks a lot of all of u. Cool solution