Unexpected Behavior When Using Room with Coroutines and Flow in Android 14
I'm facing an issue when trying to use Room with Kotlin Coroutines and Flow in my Android app targeting API level 34 (Android 14)... I have a DAO set up to fetch a list of items, and I'm using a Flow to observe changes in the database. However, I'm getting unexpected results where the flow emits an empty list even when there are items present in the database. Here’s the DAO method I’m using: ```kotlin @Dao interface ItemDao { @Query("SELECT * FROM items") fun getAllItems(): Flow<List<Item>> } ``` In my ViewModel, I collect this flow in a coroutine: ```kotlin class ItemViewModel(private val itemDao: ItemDao) : ViewModel() { val items: LiveData<List<Item>> = itemDao.getAllItems().asLiveData() } ``` I observe the `items` LiveData in my Fragment: ```kotlin class ItemFragment : Fragment() { private val viewModel: ItemViewModel by viewModels() override fun onViewCreated(view: View, savedInstanceState: Bundle?) { viewModel.items.observe(viewLifecycleOwner) { itemList -> if (itemList.isEmpty()) { Log.d("ItemFragment", "No items found") } else { // Update the UI with the list } } } } ``` I have confirmed that the database does have items in it when I run the query directly through the Room inspector. I've also tried checking for `Database` migrations and ensured that the version is correct. The issue seems to stem from the fact that the flow emits an empty list on the first collection, but when I perform another database operation (like adding a new item), the flow correctly emits the updated list. Could this be related to how the database is initialized or maybe a timing issue when observing the flow? I'm using Room version 2.4.0 and Kotlin Coroutines version 1.6.0. Any insights or recommendations on how to handle this behavior would be greatly appreciated! I'm developing on Linux with Kotlin. Thanks in advance!