👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-08

android recyclerview databinding mvvm kotlin

I just started working with After trying multiple solutions online, I still can't figure this out. I'm facing an issue with data binding in a RecyclerView where the UI does not update when the underlying data changes. My setup uses Android 14 with data binding enabled, and I'm trying to update a list of user profiles when a new profile is added. I've implemented a `ListAdapter` for better performance, but the views are not reflecting the updates despite the data being correctly modified. Here's a simplified version of my adapter: ```kotlin class UserProfileAdapter : ListAdapter<UserProfile, UserProfileViewHolder>(UserProfileDiffCallback()) { override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): UserProfileViewHolder { val binding = ItemUserProfileBinding.inflate(LayoutInflater.from(parent.context), parent, false) return UserProfileViewHolder(binding) } override fun onBindViewHolder(holder: UserProfileViewHolder, position: Int) { val userProfile = getItem(position) holder.bind(userProfile) } } class UserProfileViewHolder(private val binding: ItemUserProfileBinding) : RecyclerView.ViewHolder(binding.root) { fun bind(userProfile: UserProfile) { binding.userProfile = userProfile binding.executePendingBindings() // Ensures immediate binding } } ``` I update my list in the ViewModel using a `MutableLiveData`: ```kotlin class UserProfileViewModel : ViewModel() { private val _userProfiles = MutableLiveData<List<UserProfile>>(emptyList()) val userProfiles: LiveData<List<UserProfile>> get() = _userProfiles fun addUserProfile(profile: UserProfile) { val currentList = _userProfiles.value ?: emptyList() _userProfiles.value = currentList + profile } } ``` In my Fragment, I'm observing the LiveData: ```kotlin viewModel.userProfiles.observe(viewLifecycleOwner) { profiles -> adapter.submitList(profiles) // This should trigger an update, right? } ``` Despite this, when I add a new `UserProfile`, the RecyclerView does not update visually. I confirmed that the list in the ViewModel contains the new profile, but the UI remains stale. I also ensured that the new list is distinct from the previous one, as required by `submitList`. I've tried the following: - Calling `submitList` with a new instance of the list. - Ensuring that the binding is not being interfered with by any other UI logic. - Verifying that the `ItemUserProfileBinding` layout is properly set up with data binding. Any insights on what could be causing the data binding not to update the RecyclerView correctly? I'm working on a CLI tool that needs to handle this. Am I missing something obvious? I'm developing on Windows 11 with Kotlin. Thanks in advance!