How to disable recyclerview scroll to top (1st item) on notifyDataSetChanged

Question

I have fixed number of items in recycler view, but I update data every 10 seconds and calling notifyDataSetChanged();

When I scrolled to Nth item (EX:20th item) and on notifyDataSetChanged() called recycler view getting refreshed and auto-scroll back to 1st item. How can I stop scrolling and update the recycler view? Thanks in advance.

I don't have any special index... I have a fixed number of items. Do I need to use the maximum index? — ChandraMouli Poreddy, Dec 27 '19 at 12:32
Most of us do `adapter.notifyDataSetChanged()` once list object is update. You can also try by creating a method to in `RecyclerAdapter` class which will update the list object of adapter class and then just calls `notifyDataSetChanged()` within it. — Harpreet, Dec 27 '19 at 12:59

score 0 · Answer 1 · answered Dec 27 '19 at 12:38

0

You can create a view type and holder for your first item then set setIsRecyclable

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
    if (holder instanceof HeaderViewHolder ) {
        ((HeaderViewHolder ) holder).setIsRecyclable(false);
        ((HeaderViewHolder ) holder).bind(mData.get(position));
    }
}

answered Dec 27 '19 at 12:38

ysfcyln

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What is HeaderViewHolder here? – ChandraMouli Poreddy Dec 27 '19 at 12:45
It is a normal `ViewHolder`. You should use two different `ViewHolder`. One is for header and the other is for normal items. Then disable `recycle` for your header type. You can check [this question](https://stackoverflow.com/questions/36313079/i-want-my-recyclerview-to-not-recycle-some-items) – ysfcyln Dec 27 '19 at 12:55

score 0 · Answer 2 · edited Dec 15 '22 at 13:13

Using onSaveInstanceState you will save the state or current position of your recyclerview.Just like this.

Create variable in your activity

Parcelable recylerViewList; //this will store the position

then create this method to fetch recyclerview state

void storeInstance() {
    AttachmentsActivity.recylerViewList=mRecyclerView?.layoutManager?.onSaveInstanceState()
}// call this method before notifyDataSetChanged()

Create method to restore the state

    void restore() //call this method after notifyDataSetChanged()
    {
     mRecyclerView?.layoutManager?.onRestoreInstanceState(recylerViewList)
    }

Make sure you call this methods in activity or through activity object.

score 0 · Answer 3 · edited Oct 06 '22 at 10:28

0

You should find which items changed and use adapter.notifyItemChanged(itemChangedPosition) instead of notifyDatasetChanged()

edited Oct 06 '22 at 10:28

Syscall

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answered Oct 06 '22 at 09:13

Na Pro

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How to disable recyclerview scroll to top (1st item) on notifyDataSetChanged

3 Answers3