👀 Views: 0 💬 Answers: 1 📅 Created: 2025-08-22

android databinding recyclerview diffutil Kotlin

I've been struggling with this for a few days now and could really use some help... I've been struggling with this for a few days now and could really use some help. I'm facing an issue with DataBinding in a RecyclerView when using DiffUtil to update the list of items. The UI updates aren't applying as expected when there are changes in the underlying data model. I have implemented a custom adapter that takes advantage of DiffUtil for performance reasons, but sometimes the RecyclerView doesn't reflect the changes in the data set correctly. Here's a simplified version of my adapter code: ```kotlin class MyAdapter : ListAdapter<MyItem, MyViewHolder>(MyDiffCallback()) { override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder { val binding = DataBindingUtil.inflate<ItemBinding>( LayoutInflater.from(parent.context), R.layout.item_layout, parent, false ) return MyViewHolder(binding) } override fun onBindViewHolder(holder: MyViewHolder, position: Int) { holder.bind(getItem(position)) } } class MyViewHolder(private val binding: ItemBinding) : RecyclerView.ViewHolder(binding.root) { fun bind(item: MyItem) { binding.item = item binding.executePendingBindings() } } ``` I've noticed that when updating the list with `submitList(newList)`, sometimes the changes are not rendered correctly. For example, if I update one item in the list, other items might not refresh at all, or I see the previous state of items flickering on the screen. I've tried calling `notifyDataSetChanged()` after `submitList()` to force an update, but this negates the performance benefits of using DiffUtil. Here’s how I update the list: ```kotlin fun updateItems(newList: List<MyItem>) { submitList(newList) } ``` I am running this on Android 14, and I suspect there might be some threading issues or perhaps caching behavior causing these inconsistencies. The logs show no relevant errors, and I am using the latest versions of DataBinding and RecyclerView libraries. Is there a best practice for ensuring that the UI properly reflects the new state of the data? Any insights would be greatly appreciated! What's the best practice here? I'm working on a application that needs to handle this. Am I missing something obvious? I recently upgraded to Kotlin LTS. What are your experiences with this? Cheers for any assistance!