Passing an interceptor to retrofit builder using dagger-hilt

I’m learning about retrofit interceptors, for work purposes I’m using dagger-hilt for the injection of dependencies to fragments etc. I wrote a custom interceptor to check for connection errors and I’m trying to add it to the Retrofit.Builder():

    @Provides
    @Singleton
    fun provideApi(): StoreApi {
        return Retrofit.Builder()
            .baseUrl(Constants.BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJava3CallAdapterFactory.create())
            .build()
            .create(StoreApi::class.java)
    }

however, I have no clue how to pass that:

     val okHttpClient = OkHttpClient()
                .newBuilder()
                .addInterceptor(ConnectivityInterceptor)
                .build()

as a .client() to the retofit builder (even with dagger-hilt), any ideas?

>Solution :

You can setup a module something like this where you provide all the dependency requirements as functions and exposing them to dagger through @Provides then leave dagger to provide the dependencies as function arguments to build the dependency graph :

@Module class ApiModule {

    @Provides
    @Singleton
    internal fun provideApi(retrofit: Retrofit): FakeStoreApi {
        return retrofit
            .create(StoreApi::class.java)
    }

    @Provides
    @Singleton
    internal fun retrofit(client: OkHttpClient): Retrofit =
       Retrofit.Builder()
            .client(client)
            .baseUrl(Constants.BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJava3CallAdapterFactory.create())
            .build()

    @Provides
    @Singleton
    internal fun client(connectivityInterceptor: ConnectivityInterceptor): OkHttpClient =
        OkHttpClient.Builder()
            .addInterceptor(connectivityInterceptor)
            .build()

    @Provides
    @Singleton
    internal fun interceptor(): ConnectivityInterceptor = ConnectivityInterceptor()
}

This is a trivial example based on the supplied code. Also new is not a valid kotlin keyword. Also I assume FakeStoreApi is an interface and parent to StoreApi? Seems the wrong way round, but going based on supplied code..