👀 Views: 73 💬 Answers: 1 📅 Created: 2025-07-22

android livedata recyclerview databinding viewmodel kotlin

I've been working on this all day and I'm experiencing an issue where my RecyclerView items are not updating their views when the underlying LiveData changes. I'm using Android 13 with the latest AndroidX libraries. My RecyclerView is set up with a ListAdapter and I'm observing a LiveData list from my ViewModel. Despite the LiveData being updated, the UI does not reflect these changes. Here’s a simplified version of my code: ```kotlin class MyViewModel : ViewModel() { private val _items = MutableLiveData<List<MyItem>>() val items: LiveData<List<MyItem>> = _items fun updateItems(newItems: List<MyItem>) { _items.postValue(newItems) } } class MyAdapter : ListAdapter<MyItem, MyViewHolder>(MyItemDiffCallback()) { override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder { val view = LayoutInflater.from(parent.context).inflate(R.layout.item_view, parent, false) return MyViewHolder(view) } override fun onBindViewHolder(holder: MyViewHolder, position: Int) { holder.bind(getItem(position)) } } class MyActivity : AppCompatActivity() { private lateinit var viewModel: MyViewModel private lateinit var adapter: MyAdapter override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) viewModel = ViewModelProvider(this).get(MyViewModel::class.java) adapter = MyAdapter() recyclerView.adapter = adapter viewModel.items.observe(this) { items -> adapter.submitList(items) } } } ``` I verified that `updateItems` is being called and the LiveData is being updated. However, when I call `adapter.submitList(newItems)`, the UI doesn't reflect these changes as expected. I've tried using `notifyDataSetChanged()` on the adapter after calling `submitList()`, but it didn't help. The `DiffUtil` implementation seems fine since the changes are detected in the log, but the UI remains stale. I also checked that there's no issue with the RecyclerView layout parameters. My layout file is properly set up with data binding, and I'm using `androidx.recyclerview:recyclerview:1.2.1` and `androidx.lifecycle:lifecycle-livedata-ktx:2.5.0`. Has anyone else encountered a similar issue, or does anyone have insight into why the views would not be updating on LiveData changes? What's the correct way to implement this?