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

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