Step #5: Injecting Into the Worker

To do the import, we need:

• The PrefsRepository, to get the URL to use; and
• The ToDoRepository, to perform the actual import

Elsewhere in the app, we get those from Koin. However, elsewhere in the app, we tend to be working with either Koin-defined objects (e.g., repositories) or common Android/Jetpack classes (Fragment, ViewModel, etc.). A CoroutineWorker is none of those.

However, Koin still supports classes like CoroutineWorker (and our ImportWorker subclass). To do this, just add KoinComponent as an interface to ImportWorker:

class ImportWorker(context: Context, params: WorkerParameters) :
  CoroutineWorker(context, params), KoinComponent {

This lets us use by inject() property delegates to retrieve objects from Koin. So, add these two properties to ImportWorker to pull in our repositories:

  private val repo: ToDoRepository by inject()
  private val prefs: PrefsRepository by inject()

At runtime, by inject() will reach into the Koin object manager and retrieve our desired objects.