for medium article

network_resolver.kt

object NetworkResolver {
    // step 1, you first need to resolve Api Manager
    fun provideApiManager() = ApiManager(??)
    
    // step 2 Api manager requires retrofit Instance, provide it 
    // from parameter dependency
    fun provideApiManager(retrofit: Retrofit) = ApiManager(retrofit)
    
    // step 3 We haven't created a resolving function that provides
    // a retrofit instance, hence
    fun provideRetrofitClient() : Retrofit{
       return Retrofit.Builder()
          .baseUrl(??)
          .addConverterFactory(GsonConverterFactory.create()) 
          .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
          .client(??)
          .build()
    }
    
    // step 4 dependencies for retrofit can be passed from parameter
    fun provideRetrofitClient(baseURl:String, okHttpClient : OkHttpClient) : Retrofit{
       return Retrofit.Builder()
          .baseUrl(baseURL)
          .addConverterFactory(GsonConverterFactory.create()) 
          .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
          .client(okHttpClient)
          .build()
    }

    // step 5, similarly add okhttp and baseUrl
    fun provideBaseURl():String = "http://www.someURL.com"
    fun provideOkHttpClient() : OkHttpClient = OkHttpClient
            .Builder()
            .build()
}