How to get Context when using Koin in an Android library?

Hi,

I’m creating an android library that contains UI components and I’ve managed to use Koin by implementing a custom KoinComponent:

KoinKomponent.kt

import org.koin.android.ext.koin.androidLogger
import org.koin.core.Koin
import org.koin.core.KoinComponent
import org.koin.dsl.koinApplication

private val koinInstance = koinApplication {
    androidLogger()
    modules(modules)
}

interface CustomKoinComponent : KoinComponent {
    override fun getKoin(): Koin = koinInstance.koin
}

And this is my modules list so far:

KoinModule.kt

import com.google.firebase.analytics.FirebaseAnalytics
import com.google.firebase.perf.FirebasePerformance
import org.koin.android.ext.koin.androidContext
import org.koin.dsl.module

private val firebaseModule = module {
    single { FirebasePerformance.getInstance() }
    single { FirebaseAnalytics.getInstance(get()) } // Can't resolve Context instance.
}

val modules = listOf(
    firebaseModule
)

But then I get an error Caused by: org.koin.core.error.NoBeanDefFoundException: No definition found for 'android.content.Context' has been found. Check your module definitions.. What is fair since I’m not starting Koin from an Application nor declaring a context instance.

My question is, how do I get Context in this scenario? Is there a proper way using Koin or should I find a way to parametrize the context from the main module?

I’m using org.koin:koin-android:2.0.1.

Thanks!

[pawelmarchewka]

Hi @cassioso

Yes, I use it that way in commercially available SDK and it works 🙂

object TcxKoinContext {
    private lateinit var appContext: Context

    val koin: Koin by lazy {
        koinApplication {
            androidContext(appContext)
            if (Log.ON) androidLogger()
            modules(KoinModules.all())
        }.koin
    }

    @Synchronized
    fun init(context: Context) {
        check(!::appContext.isInitialized) { "Already initialized!" }

        appContext = context.applicationContext
    }
}

and

interface TcxKoinComponent : KoinComponent {
    override fun getKoin(): Koin = TcxKoinContext.koin
} 

[ThePredators]

Hi @cassioso

Yes, I use it that way in commercially available SDK and it works 🙂

object TcxKoinContext {
    private lateinit var appContext: Context

    val koin: Koin by lazy {
        koinApplication {
            androidContext(appContext)
            if (Log.ON) androidLogger()
            modules(KoinModules.all())
        }.koin
    }

    @Synchronized
    fun init(context: Context) {
        check(!::appContext.isInitialized) { "Already initialized!" }

        appContext = context.applicationContext
    }
}

and

interface TcxKoinComponent : KoinComponent {
    override fun getKoin(): Koin = TcxKoinContext.koin
} 

that worked for me pretty well !!

from the application that use the AAR containing Koin, you just need to call : TcxKoinContext.init(context) // where context is application context. and of course do not forget to extend the TcxKoinComponent in your Class that use injections !