Android Networking: Fundamentals

Sep 6 2022 · Kotlin 1.6, Android 12, Android Studio Chipmunk | 2021.2.1 Patch 1

Part 2: Implement Retrofit Basics

11. Build Retrofit Components

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Notes: 11. Build Retrofit Components

The student materials have been reviewed and are updated as of July 2022.

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As you’ve learned, to use Retrofit, you need to first build a Retrofit client, providing the Base URL, and other configuration you might need. Let’s see how to do that!

implementation 'com.squareup.retrofit2:retrofit:2.7.2'
compileOptions {
  sourceCompatibility JavaVersion.VERSION_1_8
  targetCompatibility JavaVersion.VERSION_1_8
fun buildClient(): OkHttpClient = 
fun buildRetrofit(): Retrofit {
  return Retrofit.Builder()
interface RemoteApiService {
fun buildApiService(): RemoteApiService = 
class RemoteApi(private val apiService: RemoteApiService) {
private val apiService by lazy { buildApiService() }

val remoteApi by lazy { RemoteApi(apiService) }