RecyclerView inside NestedScrollView does not give correct visible item position

Question

I have a RecyclerView inside a NestedScrollView and I'm trying to get the position of the last visible list item during scroll events using. The following code allows me to reliably detect scroll events:

val recyclerView = nestedScrollView.getChildAt(0) as RecyclerView

nestedScrollView.setOnScrollChangeListener { v: NestedScrollView?, scrollX: Int, scrollY: Int, oldScrollX: Int, oldScrollY: Int ->
    val layoutManager = recyclerView?.layoutManager as? LinearLayoutManager
    val lastVisiblePosition = layoutManager?.findLastVisibleItemPosition()
}

The problem however is that here lastVisiblePosition always ends up being the last item in the list whether this is actually on scree or not. Where could I be going wrong?

I tried both wrap_content and match_parent. First visible item is always the first list item and last is always the last item. — Spaci Tron, Jan 24 '18 at 18:28

score 15 · Answer 1 · answered Jan 24 '18 at 19:53

15

If you put a RecyclerView inside a scrollable container—a NestedScrollView in your case—it will basically become a fancy LinearLayout, inflating and showing all the items at once. You get the first and last item as the first and last one visible because—to the RecyclerView—they are. All the items got inflated and added, so all of them are "visible on screen" inside the scrollable view.

The easy solution would be to just not nest the RecyclerView inside the NestedScrollView. A RecyclerView can scroll already, so you could just put whatever header or footer you need inside the RecyclerView as well. Nesting scrollable views always has drawbacks and you should try to avoid it whenever possible.

answered Jan 24 '18 at 19:53

David Medenjak

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So, there is no way to stop recyclerview from inflating all items at a time when it is inside nestedscrollview? – Jaydip Kalkani Oct 23 '18 at 06:35
what if we want to implement collapsing app bar @David – Parth Anjaria Jan 15 '19 at 07:54
@ParthAnjaria then you use a CoordinatorLayout with the AppBarLayout & RecyclerView. There should be plenty of examples online – David Medenjak Jan 15 '19 at 08:59
what if I want to add swipe to refresh with recyclerview? @DavidMedenjak – Nevil Ghelani Jun 01 '19 at 08:50
@NevilGhelani SwipeRefreshLayout doesn't interfere with RVs recycling – David Medenjak Jun 01 '19 at 10:56
@DavidMedenjak You are right but I want to make an app that can refresh recycler view on swipe. Is there any way to do? – Nevil Ghelani Jun 01 '19 at 10:58
@NevilGhelani I'm not sure what you are asking. Just put RV into a SwipeRefreshLayout? `` – David Medenjak Jun 01 '19 at 12:31

score 0 · Answer 2 · answered May 26 '21 at 09:54

0

After researching a lot of sites and can not find a solution for using findLastVisibleItemPosition method. I used another solution and answered it in there:
Can't find RecyclerView visible item position inside NestedScrollView

answered May 26 '21 at 09:54

NhatVM

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RecyclerView inside NestedScrollView does not give correct visible item position

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