sample.kt

class ListItemViewModel(val skillDescription: String): BaseObservable {
  // Needs to be @Bindable?
  var isChecked: Boolean = false
}

...

list_item.xml

<checkbox
    android:id="@+id/skill_selected_checkbox"
    android:checked="@={viewModel.isChecked}"
    ... />
    
...

Adapter's data structure is now a List<ListItemViewModel> which means that list_item's data binder expects a
ListItemViewModel to bind. Because this model is mutable, we can retrieve the isChecked states when the submit
button is clicked.

To automatically change the enabled state of the submit button, we could either use a Listener from ListItemViewModel
or an observer on it. Conceivably, there's a recyclerview view model that we're using as well:

class RecyclerViewParentViewModel: Observer @Inject constructor() {
  val adapterData: List<ListItemViewModel> by lazy { createListItemViewModel() }
  // Bindable?
  val canContinue: Boolean = false
  
  override fun update(Observable o, Object arg) {
    val listItemViewModel = o as ListItemViewModel
    canContinue = canContinue || listItemViewModel.isChecked // Automatically notifies observers if changes
  }
  
  private fun createListItemViewModel(): List<ListItemViewModel> {
    val items: List<ListItemViewModel> = ...
    // WARNING: we have to remove the observer otherwise it creates a cycle in the reference graph which will leak all
    // the item views.
    items.forEach { it.addObserver(RecyclerViewParentViewModel::this) }
  }
}