android - RecyclerView ScrollListener inside NestedScrollView

Question

I have an EndlessRecyclerView at the end of a NestedScrollView. EndlessRecyclerView means: when user scrolls to the bottom of the recyclerView it loads more data. This is already implemented and working elsewhere but when I put the recyclerView inside the NestedScrollView the OnScrollListener events doesn't fire.

XML design:

<NestedScrollView>

     <Other views/>

     <EndlessRecyclerView/>

</NestedScrollView >

Code:

recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            // This is never fired! Here is where I implement the logic of EndlessRecyclerView
        }
    });

How do I get scroll event for above case?

I know that is not good to have two scrollable views inside each other. But, how do I have the above case without having two scrollable views?

I already followed this link but it doesn't work: scroll event for recyclerview inside scrollview android

question from:https://stackoverflow.com/questions/39894792/recyclerview-scrolllistener-inside-nestedscrollview

Answer 1

To achieve endless scrolling for recycler view which is under NestedScrollView, you can use "NestedScrollView.OnScrollChangeListener"

nestedScrollView.setOnScrollChangeListener((NestedScrollView.OnScrollChangeListener) (v, scrollX, scrollY, oldScrollX, oldScrollY) -> {
            if(v.getChildAt(v.getChildCount() - 1) != null) {
                if ((scrollY >= (v.getChildAt(v.getChildCount() - 1).getMeasuredHeight() - v.getMeasuredHeight())) &&
                        scrollY > oldScrollY) {
                        //code to fetch more data for endless scrolling
                }
            }
        });

Here v.getChildCount() -1 should give you the recycler view for which you be implementing endless scrolling.

Also scrollY > oldScrollY confirms that the page is being scrolled down.

Reference: NestedScrollView.OnScrollChangeListener