Good Morning. did anybody faced an issue in Inject...

# koin

[Saher Al-Sous]

Good Morning.
did anybody faced an issue in Injecting Context from Android into SqlDelight Driver using koin for a KMP project?
I have a Kotlin Multi-platform project, that has iOS, Android and Desktop in it, and I wanted to use SqlDelight to store data. however I'm using Koin as a DI.
Since I have several platforms, I made the commonMain to startKoin.
This file contains the expect value that will return the SqlDriver for each platform, and the needed implementation to communicate with the database from commonMain.

expect val dbModule: Module

val repoModel = module {
    single<DbRepository> {
        DbRepository(get<SqlDriver>())
    }
}

fun initKoin() = startKoin {
    modules(
        dbModule,
        repoModel
    )
}

I found out that each platform have an Issue, so I decided to focus on one platform at a time.
the problem of the Android platform is that you can't get the context needed for the AndroidSqliteDriver.

actual val dbModule: Module = module {
    single<SqlDriver> {
        AndroidSqliteDriver(Kos.Schema, androidContext(), "Kos")
    }
}

for Android, you need the context to initialize the driver, but you have no way to inject it. since I'm starting Koin from commonMain, I couldn't find a way to get the android context from the Application class. I tried this way:

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        startKoin {
            androidContext(this@MyApp)
        }
    }
}

also this way

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        koinApplication {
            androidContext(this@MyApp)
        }
    }
}

and even this way

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        loadKoinModules(
            module { 
                single { this@MyApp }
            }
        )
    }
}

and I always get an error...

Caused by: org.koin.core.error.KoinAppAlreadyStartedException: A Koin Application has already been started

Caused by: org.koin.android.error.MissingAndroidContextException: Can't resolve Context instance. Please use androidContext() function in your KoinApplication configuration.

how is it possible to get android context for SqlDelight driver within kmp using Koin?

[Saher Al-Sous]

probably should get the context manually outside Koin?

[arnaud.giuliani]

in your start for Koin on Android, you need to add androiContext() to your startKoin section

[Saher Al-Sous]

I did that in one of the things I tried...
'androidContext(this@MyApp)' but that didn't work, simply because I can't start koin from 2 places.
I can start it from android and get the context but it won't be okey for other platforms, I think the only way I have now is manually with 'lateinit' value that captures the context on startup.

[arnaud.giuliani]

start can be different depending on your native target. You can reuse a common shared module

[Saher Al-Sous]

I think i will use the lateinit for now. without Koin inside Android.

[arnaud.giuliani]

you can reuse Koin instance and use declare() to add an object inside the current context

[Saher Al-Sous]

Thank you so much for telling me about this, never heard of it before...
I think I'm not sure how to implement it:
I did like this:

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        val module = module {
            single { applicationContext }
        }
        getKoin().declare(
            module
        )
    }
}

and this

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        getKoin().declare(
            applicationContext
        )

but I got same error on both ways:

java.lang.IllegalStateException: KoinApplication has not been started

[arnaud.giuliani]

use it with the target object, here your context: koin.declare(context)

[arnaud.giuliani]

or koin.declare(this) for your appContext

[Saher Al-Sous]

I tried that. it didn't work as well...
the only thing that worked for me is doing it like this:

@SuppressLint("StaticFieldLeak")
lateinit var androidContext: Context

actual val dbModule: Module = module {
    single<Context> { androidContext }
    single<SqlDriver> {
        AndroidSqliteDriver(ReminderDb.Schema, get(), "ReminderDb")
    }
}

class MyApp: Application() {
    override fun onCreate() {
        super.onCreate()
        androidContext = applicationContext
    }
}