Android Networking: Beyond the Basics

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

Part 2: Retrofit With Kotlin Coroutines

09. Use Kotlin Coroutines to Shorten API Calls

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Previous episode: 08. Introduction Next episode: 10. Include Built-in Retrofit Support for Coroutines

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Just to show how easy implementing coroutines is, and how the code is more understandable than using callbacks, or some other mechanism, you’ll change the deleteTask API call, to rely on Coroutines. Let’s see how to do just that! :]

Demo

To start implementing coroutines, you need to add their dependency to the project. Open app level build.gradle. Then add the following dependencies to the project:

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.5.1'
fun deleteTask(taskId: String): Result<String> {
}
suspend fun deleteTask(taskId: String) = withContext(Dispatchers.IO) {

}
suspend fun deleteTask(taskId: String) = withContext(Dispatchers.IO) {
  try {
    val data = apiService.deleteNote(taskId).execute().body()

    if (data?.message == null) {
      Failure(NullPointerException("No response!"))
    } else {
      Success(data.message)
    }
  } catch (error: Throwable) {
    Failure(error)
  }
}
viewLifecycleOwner.lifecycleScope.launch {

}
val result = remoteApi.deleteTask(taskId)

if (result is Success) {
  taskOptionSelectedListener?.onTaskDeleted(taskId)
}
dismissAllowingStateLoss()