NetworkModule.kt

@Module
@InstallIn(SingletonComponent::class)
object NetworkModule {
    @JvmStatic
    @Provides
    @Singleton
    fun provideApiInterface(): ApiService {
        val retrofit = getRetrofit(okHttpClient)
        return retrofit.create(ApiService::class.java)
    }

    @JvmStatic
    @Provides
    @Singleton
    fun getRetrofit(okHttpClient: OkHttpClient?): Retrofit {
        return Retrofit.Builder()
                .baseUrl(APIConstants.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(okHttpClient!!)
                .build()
    }

    @JvmStatic
    @get:Singleton
    @get:Provides
    val okHttpClient: OkHttpClient
        get() {
            val okHttpClientBuilder = OkHttpClient.Builder()
            okHttpClientBuilder.connectTimeout(APIConstants.CONNECT_TIMEOUT, TimeUnit.MILLISECONDS)
            okHttpClientBuilder.readTimeout(APIConstants.READ_TIMEOUT, TimeUnit.MILLISECONDS)
            okHttpClientBuilder.writeTimeout(APIConstants.WRITE_TIMEOUT, TimeUnit.MILLISECONDS)
            okHttpClientBuilder.addInterceptor(RequestInterceptor())
            okHttpClientBuilder.addInterceptor(HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
            return okHttpClientBuilder.build()
        }
}