Retrofit+Rx+Moshi+Log sample.

ServiceGenerator.kt

object ServiceGenerator {

    private lateinit var moshi: Moshi
    private lateinit var retrofit: Retrofit

    /**
     * Initialize{@link Moshi}and{@link Retrofit}
     */
    fun init(context: Context?) {
        moshi = Moshi.Builder()
                .add(KotlinJsonAdapterFactory())
                .build()

        val httpClientBuilder = OkHttpClient.Builder()
                .connectTimeout(30, TimeUnit.SECONDS) // Modify as necessary

        // log
        val logInterceptor = HttpLoggingInterceptor()
                .setLevel(HttpLoggingInterceptor.Level.BODY)
        if (!httpClientBuilder.interceptors().contains(logInterceptor)) {
            httpClientBuilder.addInterceptor(logInterceptor)
        }

        retrofit = Retrofit.Builder()
                .baseUrl(context?.getString(R.string.base_url) ?: "") // Modify as necessary
                .addConverterFactory(MoshiConverterFactory.create(moshi))
                .addCallAdapterFactory(RxJava2CallAdapterFactory.createWithScheduler(Schedulers.io()))
                .client(httpClientBuilder.build())
                .build()
    }

    fun <T> createService(serviceClass: Class<T>): T
        = retrofit.create(serviceClass)
}