👀 Views: 50 💬 Answers: 1 📅 Created: 2025-06-14

android recyclerview livedata kotlin

I'm experiencing a crash in my app when trying to bind data to a RecyclerView's ViewHolder. I'm using Android 13 (API level 33) along with ViewModel and LiveData. The crash occurs intermittently and the error log shows `java.lang.IndexOutOfBoundsException: Index: 5, Size: 5` which leads me to believe that the data might not be in sync with the RecyclerView's adapter. Here is the code snippet where I set up my RecyclerView and observe the LiveData: ```kotlin class MyFragment : Fragment() { private lateinit var viewModel: MyViewModel private lateinit var adapter: MyAdapter override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { val view = inflater.inflate(R.layout.fragment_my, container, false) adapter = MyAdapter() val recyclerView: RecyclerView = view.findViewById(R.id.recycler_view) recyclerView.adapter = adapter recyclerView.layoutManager = LinearLayoutManager(context) viewModel = ViewModelProvider(this).get(MyViewModel::class.java) viewModel.myData.observe(viewLifecycleOwner) { dataList -> adapter.submitList(dataList) } return view } } ``` And my adapter looks like this: ```kotlin class MyAdapter : ListAdapter<MyDataClass, MyViewHolder>(DIFF_CALLBACK) { 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) { val item = getItem(position) holder.bind(item) } } ``` I've tried using `submitList` with a new list each time, and even verified that the size of the incoming list matches the expected size in the adapter. Still, the crash occurs, but only when I perform rapid updates to the LiveData. Could this be an issue with how `submitList` handles updates or a potential threading issue? Any insights or suggestions would be appreciated.