Recyclerview fully scroll to position

Question

My recyclerview should open the first item closed. To this end, I wrote these lines.

 LinearLayoutManager llm = new LinearLayoutManager(getActivity());
 llm.scrollToPosition(1);
 paletteRecyclerView.setLayoutManager(llm);

I want to check if it is possible to scroll to position 1 fully. If my recyclerview is small I must open it without closing the first item. How can I check it?

check if `recyclerView.getHeight() > recyclerView.computeVerticalScrollRange` and if this is true then do not scroll to position 1. — Akshay Bhat 'AB', Dec 07 '16 at 08:59
I've checked these two parameters returning 0. What can be the reason? — Butterfly, Dec 07 '16 at 10:05

score 0 · Answer 1 · answered Dec 07 '16 at 09:04

0

Try with below code...

LinearLayoutManager llm = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(llm);

RecyclerView.Adapter adapter = new YourAdapter();
recyclerView.setAdapter(adapter);

recyclerView.scrollToPosition(position);

answered Dec 07 '16 at 09:04

Priyank Patel

12,244
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score 0 · Accepted Answer · answered Dec 07 '16 at 09:15

0

I assume that you want to know if there are items to scroll in RecyclerView. So you can check as below after setting the adapter to the recyclerView.

recyclerView.post(new Runnable() {
        @Override
        public void run() {
            int recyclerViewheight = recyclerView.getHeight();
            int totalChildViewsHeight = recyclerView.computeVerticalScrollRange();
            if (recyclerViewheight > totalChildViewsHeight) {
                //there is no scroll (there are no more items to scroll)
            } else {
                //there is scroll (there are items to scroll)
            }
        }
    });

answered Dec 07 '16 at 09:15

Akshay Bhat 'AB'

2,690
3
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I've checked these two parameters returning 0. What can be the reason? – Butterfly Dec 07 '16 at 10:05
are you doing it on `recyclerView.post()` and after setting adapter? – Akshay Bhat 'AB' Dec 07 '16 at 10:29
No, Why I must do recyclerView.post()? – Butterfly Dec 07 '16 at 10:46
Because at the time of your call, the recyclerView will not be rendered on screen so you can't get the height. If you do it on `post()`, the operation in runnable will be done in the next pass after rendering. – Akshay Bhat 'AB' Dec 07 '16 at 10:48
Thank you so much for your help :) – Butterfly Dec 07 '16 at 11:01

Recyclerview fully scroll to position

2 Answers2