NetModule.kt

@Module
class NetModule(private val baseUrl: String) {

  @Provides
  @Singleton
  fun providesOkHttpClient(): OkHttpClient = OkHttpClient.Builder().build()

  @Provides
  @Singleton
  fun providesMoshi(): Moshi = Moshi.Builder().add(KotlinJsonAdapterFactory()).build()

  @Provides
  @Singleton
  fun providesRetrofit(okHttpClient: OkHttpClient, moshi: Moshi): Retrofit {
    return Builder().client(okHttpClient).baseUrl(baseUrl)
        .addConverterFactory(MoshiConverterFactory.create(moshi))
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
        .build()
  }

  @Provides
  @Singleton
  fun providesApiInterface(retrofit: Retrofit): ApiInterface = retrofit.create(
      ApiInterface::class.java)
}