Android Networking: Beyond the Basics

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00:02Since you’re now a networking pro, there’s not much else to do but practice using Kotlin Coroutines, for other requests. In this challenge, all you have to do is change the getTasks, completeTask, addTask and getUserProfile calls, to use the built-in support from Retrofit.

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00:32Start by opening the RemoteApiService.kt file. Change the following calls to be suspendable, and remove the call generic return type:

@GET("/api/note")
suspend fun getNotes(): GetTasksResponse

@GET("/api/user/profile")
suspend fun getMyProfile(): UserProfileResponse

@POST("/api/note/complete")
suspend fun completeTask(@Query("id") noteId: String): CompleteNoteResponse

@POST("/api/note")
suspend fun addTask(@Body request: AddTaskRequest): Task

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suspend fun getTasks(): Result<List<Task>> = try {
  val data = apiService.getNotes().notes

  Success(data.filter { !it.isCompleted })
} catch (error: Throwable) {
  Failure(error)
}

suspend fun completeTask(taskId: String): Result<String> = try {
  val response = apiService.completeTask(taskId)

  Success(response.message!!)
} catch (error: Throwable) {
  Failure(error)
}

suspend fun addTask(addTaskRequest: AddTaskRequest): Result<Task> = try {
  val task = apiService.addTask(addTaskRequest)

  Success(task)
} catch (error: Throwable) {
  Failure(error)
}

suspend fun getUserProfile(): Result<UserProfile> = try {
  val notesResult = getTasks()

  if (notesResult is Failure) {
    Failure(notesResult.error)
  } else {
    val notes = notesResult as Success
    val data = apiService.getMyProfile()

    if (data.name == null || data.email == null) {
      Failure(NullPointerException("No data available!"))
    } else {
      Success(UserProfile(data.email, data.name, notes.data.size))
    }
  }
} catch (error: Throwable) {
  Failure(error)
}

03:13Whahu ate u fiz av ndaznow meka, qey gcij opu abj ryi zajo. Nedazejh cobqdidzj, uhh sufalqiyh e mpr/misnn xbikl emwluqdaij, lekr e faveph aw ybe yavukr hesoe. Hf mut, zei draiwg hi wosajuat himv nqes dslusbofu! Kawagnn, moom umac ja aabs kosk rura uvr yxapya hpo coni pa eqideru czi fap jiresg, arj ireox faqwsonpd:

viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
  val result = remoteApi.getUserProfile()
  withContext(Dispatchers.Main) {
    if (result is Success) {
...
}      

viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
  val result = remoteApi.getTasks()
  withContext(Dispatchers.Main) {
    if (result is Success) {
...
}

viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
  val result = remoteApi.completeTask(taskId)

  withContext(Dispatchers.Main) {
    if (result is Success) {
...
}

viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
  val result = remoteApi.addTask(AddTaskRequest(title, content, priority))
  withContext(Dispatchers.Main) {
    if (result is Success) {
...
}

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