implementing LiveData implementation guide UI After Database Changes in Room with Kotlin Coroutines
I'm working on a personal project and I'm working with an scenario where my UI is not updating after changes in the Room database while using LiveData and Kotlin Coroutines. I have set up a simple DAO with a method to insert data and observe changes from the database using LiveData, but after inserting a new entry, the UI does not refresh as expected. Here's a snippet of my DAO: ```kotlin @Dao interface UserDao { @Insert(onConflict = OnConflictStrategy.REPLACE) suspend fun insertUser(user: User) @Query("SELECT * FROM users") fun getAllUsers(): LiveData<List<User>> } ``` In my ViewModel, I am launching a coroutine to insert a user: ```kotlin class UserViewModel(application: Application) : AndroidViewModel(application) { private val userDao: UserDao = UserDatabase.getDatabase(application).userDao() val users: LiveData<List<User>> = userDao.getAllUsers() fun addUser(user: User) { viewModelScope.launch { userDao.insertUser(user) } } } ``` Finally, in my Activity, I observe the LiveData: ```kotlin class UserActivity : AppCompatActivity() { private lateinit var viewModel: UserViewModel override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_user) viewModel = ViewModelProvider(this).get(UserViewModel::class.java) viewModel.users.observe(this, Observer { userList -> // Update UI with the userList }) } } ``` The question is, when I call `addUser(user)` from my Activity after clicking a button, the UI does not reflect the new user until I restart the app. I've confirmed that the user is actually being inserted into the database by querying it directly. I suspect this might have something to do with threading or how LiveData is being observed, but I can’t figure out what’s wrong. I'm using Room version 2.4.3 and Kotlin Coroutines version 1.6.0. Any suggestions on what could be going wrong here? I'm working on a web app that needs to handle this. Any ideas what could be causing this?