android - How to pass a parameter to a Koin single{} in a Koin module? - Stack Overflow

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I have Koin in my project, and I instantiate retrofit like this in the appmodule:

single<ApiService> {
    Retrofit.Builder()
        .baseUrl(";)
        .addConverterFactory(JacksonConverterFactory.create())
        .addConverterFactory(ScalarsConverterFactory.create())
        .build()
        .create(ApiService::class.java)
}

The issue is that I need to parametrize the baseUrl to retrofit, because the user can change it with a textfield. How can I tell Koin that must initialize this singleton for retrofit with a dinamically passed variable? I only found very complex samples for doing this using factory instead of singleton, and doing it with field injection instead of constructor injection, so I hope there is a simpler way.

I have Koin in my project, and I instantiate retrofit like this in the appmodule:

single<ApiService> {
    Retrofit.Builder()
        .baseUrl("https://myurl.es")
        .addConverterFactory(JacksonConverterFactory.create())
        .addConverterFactory(ScalarsConverterFactory.create())
        .build()
        .create(ApiService::class.java)
}

The issue is that I need to parametrize the baseUrl to retrofit, because the user can change it with a textfield. How can I tell Koin that must initialize this singleton for retrofit with a dinamically passed variable? I only found very complex samples for doing this using factory instead of singleton, and doing it with field injection instead of constructor injection, so I hope there is a simpler way.

• android
• kotlin
• dependency-injection
• android-jetpack-compose
• koin

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1 Answer 1

Sorted by: Reset to default 0

this is a bit tricky .
we have more than one way to get params in koin .
1- from dependency graph
so you will add your named dependency (because I think will need more than one String)
for me I prefer to do that with annotations

@Named
annotation class YourAnnotation

or in DSL like that

single(named("yourName")) { "what ever string" }

and after that you can get your string from the graph like that

single { ApiService(get(named<YourAnnotation>())) }

or in DSL

single { ApiService(get(named("yourName"))) } 

2- pass it with params

val apiService : APIService by inject { parametersOf(firstParam,secondParam) 

and in your module you can access your params like this

single { params -> Presenter(params[0],params[1]) }

hope this will help you .

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