Using Recyclerview with DiffUtil.ItemCallback doesn't scroll to top?

Question

I do search of items and every time I fetch from server When I search "o" it works and then "ot" it works again and as a result of "o" search I have let's say 20 items and in case "ot" I have 10 items which are part of that 20 items and I do remove t in EditText it shows 20 items only the recyclerview scroll indicator is in the middle Here is my Code for diffUtil

ListAdapter<Asset, SearchAdapter.ViewHolder>(object : DiffUtil.ItemCallback<Asset>() {

    override fun areItemsTheSame(oldItem: Asset, newItem: Asset): Boolean {
        return oldItem.assetId == newItem.assetId && oldItem.originalTitle ==newItem.originalTitle
    }

    override fun areContentsTheSame(oldItem: Asset, newItem: Asset): Boolean {
        return oldItem == newItem
    }

}




  viewModel.searchAssets.observe(viewLifecycleOwner, Observer {
      searchAdapter.submitList(it)
    })

Here you can see the video I have filmed https://drive.google.com/drive/folders/1ia5y9TtL0PSAM1M4hVBILWcdSK1BDyKI?usp=sharing

Artem Mostyaev · Accepted Answer · 2021-05-07 16:25:35Z

6

I want to answer my own question as I got an answer from Yiğit

submit list has another overload which receives a callback when list applied you can use that one and just call rv.scrollToPosition(0)

Here is my code:

searchAdapter.submitList(it) {
   viewBinding.searchList.scrollToPosition(0)
}

edited May 7, 2021 at 16:25

Artem Mostyaev

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answered Aug 27, 2019 at 20:08

I.S

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PPartisan · Accepted Answer · 2019-08-27 13:45:15Z

1

This is expected behaviour for DiffUtil. If you want to scroll to the top of your RecyclerView after the result have been updated, you can call layoutManager.scrollToPositionWithOffset(0, 0), or recyclerView.smoothScrollToPosition(0)

answered Aug 27, 2019 at 13:45

PPartisan

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5 Comments

I.S Over a year ago

where should I call layoutManager.scrollToPositionWithOffset(0, 0) ?

PPartisan Over a year ago

After your recyclerview's adapter has been updated (i.e. notifyDataSetChanged()), or after you've called dispatchUpdatesTo(...) on your DiffResult

I.S Over a year ago

I don't call notifyDataSetChanged() and I have submitList() in adapter and DiffUtil.ItemCallback<>() and my Adapter extends ListAdapter<Asset, SearchAdapter.ViewHolder>(diffCallback)

PPartisan Over a year ago

I'm not familiar with this SearchAdapter, is it part of a library? Try calling scrollTo... after you've called submitList(...)?

I.S Over a year ago

SearchAdapter is my adapter

Konstantin Konopko · Accepted Answer · 2025-05-02 14:53:29Z

0

You can just wait until a list view updated then scroll:

listAdapter.update(data) // update() method proceed data with DiffUtil
binding.listView.post {
    binding.listView.scrollToPosition(0)
}

answered May 2 at 14:53

Konstantin Konopko

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