Android Networking: Beyond the Basics

Sep 8 2022 · Kotlin 1.7.10, Android 12, Android Studio Chipmunk

Part 1: Implement Advanced Retrofit

04. Challenge: Error Handling

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Previous episode: 03. Implement Logging Interceptors & Error Handling Next episode: 05. Intercept Authentication

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Now that you’ve added a few new concepts to your API calls, it’s time to practice them, in a challenge! :] In this challenge, you have to use the Result class, refactor a few API calls, and utilize better error handling!


Alright, let’s start with the registerUser call:

fun registerUser(userDataRequest: UserDataRequest, onUserCreated: (Result<String>) -> Unit)
remoteApi.registerUser(UserDataRequest(email, password, username)) { result ->
  if (result is Success) {
  } else {
fun getTasks(onTasksReceived: (Result<List<Task>>) -> Unit)
fun addTask(addTaskRequest: AddTaskRequest, onTaskCreated: (Result<Task>) -> Unit)

fun getUserProfile(onUserProfileReceived: (Result<UserProfile>) -> Unit)

getTasks { result ->
  if (result is Failure && result.error !is NullPointerException) {
  val tasks = result as Success
remoteApi.getTasks { result ->
  if (result is Success) {
  } else {
remoteApi.getUserProfile { result ->
  if (result is Success) {
    userEmail.text =
    userName.text = getString(R.string.user_name_text,
    numberOfNotes.text = getString(R.string.number_of_notes_text,