👀 Views: 46 💬 Answers: 1 📅 Created: 2025-06-10

android room coroutines flow viewmodel Kotlin

I'm reviewing some code and I'm getting frustrated with I've been banging my head against this for hours. I'm working on a project and hit a roadblock. I'm experiencing unexpected behavior when trying to observe a database using Room and Flow within my ViewModel. On Android 14, I have set up a repository pattern that exposes a Flow from a Room database. However, it seems the Flow doesn't emit updates as expected after the initial emission. Here's a simplified version of my implementation: In my Data Access Object (DAO): ```kotlin @Dao interface UserDao { @Query("SELECT * FROM users") fun getAllUsers(): Flow<List<User>> } ``` In my Repository: ```kotlin class UserRepository(private val userDao: UserDao) { val allUsers: Flow<List<User>> = userDao.getAllUsers() } ``` In my ViewModel: ```kotlin class UserViewModel(private val repository: UserRepository) : ViewModel() { val users: LiveData<List<User>> = repository.allUsers.asLiveData() } ``` In my Fragment, I'm observing the LiveData: ```kotlin class UserFragment : Fragment() { private lateinit var viewModel: UserViewModel override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel = ViewModelProvider(this).get(UserViewModel::class.java) viewModel.users.observe(viewLifecycleOwner) { userList -> // Update UI } } } ``` The scenario I'm working with is that when I add or delete users from the database, the `observe` block does not get triggered. I've confirmed that the database operations are working correctly, as I can see changes in the database when querying it directly. I'm using Room version 2.5.0 and Kotlin Coroutines version 1.6.0. I've also tried adding a manual refresh by re-querying the database after performing insert/delete operations, but it feels unnecessary. Are there any known issues with Flow and Room in Android 14, or could there be a question with my setup? Any insights would be greatly appreciated! Is there a better approach? My development environment is macOS. Thanks in advance! I'm coming from a different tech stack and learning Kotlin. Is this even possible? Could this be a known issue?