ViewModel.kt

private val dummyData = arrayOfNulls<DemoData>(DUMMY_ENTRY_COUNT)

val items: LiveData<Resource<List<DemoData?>?>> = repository.getDemoData().map {
    if (it.loading) {
        Resource.Loading(dummyData.toList())
    } else it
}

val itemBinding: ItemBinding<DemoData> = { data, position ->
    when (data) {
        is DemoData.A -> R.layout.list_item_a
        is DemoData.B -> R.layout.list_item_b
        else -> if (position % 2 == 0) { R.layout.list_item_a } else R.layout.list_item_b
    }
}