gistfile1.txt

// Defining a cache of 5 MB size
val cacheSize = (5 * 1024 * 1024).toLong()

//Initializing instance of Cache class
val myCache = Cache(context.cacheDir, cacheSize)

//defining okhttpclient instance
val okHttpClient = OkHttpClient.Builder()
            .cache(myCache)
            .addInterceptor { chain ->
                var request = chain.request()
                request = if (hasNetwork(context))
                    request
                        .newBuilder()
                        .cacheControl(
                            CacheControl.Builder()
                                .maxAge(30, TimeUnit.MINUTES)
                                .build()
                        )
                        .build()
                else
                    request
                        .newBuilder()
                        .cacheControl(
                            CacheControl.Builder()
                                .maxStale(1, TimeUnit.DAYS)
                                .build()
                        )
                        .build()
                chain.proceed(request)
            }
            .build()

Please change the .txt to .kt, for better readability in the article