Horizontal RecyclerView inside ViewPager is not scrolling

Question

I have a horizontal RecyclerView inside a Complex hierarchy that looks like this -

<ViewPager id="+@id/first">
    <ViewPager id="+@id/second"> this viewpager is taking away the scroll event
        <SwipeToRefreshLayout>
            <RecyclerView> //this one is vertical
                <RecyclerView id="@id/rv1"> //this one is horizontal
                <RecyclerView id="@id/rv2"> //this one is working fine (different type)
            </RecyclerView>
        </SwipeToRefreshLayout>
    </ViewPager>
</ViewPager>

Now the problem is that the second ViewPager is hijacking the scroll from Horizontal RV. There are 2 type of Horizontal RV (RV1 and RV2) in that vertical RV. But only one of them (RV1) is facing this problem. The second one (RV2) is working properly. Also when I press and hold then the scrolling is working fine. And when RV1 is already scrolling and has not settle, then also scrolling works fine. I have referred to other answers talking about setting nestedScrolling false. Nothing seems to be working.

Answer 1

You can achieve this by overriding onInterceptTouchEvent method:

 mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            @Override
            public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent event) {
                int action = event.getAction();
               
                switch (action) {
                    case MotionEvent.ACTION_DOWN:
                        rv.getParent().requestDisallowInterceptTouchEvent(true);

                        break;
                
                }
                return false;
            }

            @Override
            public void onTouchEvent(@NonNull RecyclerView view, @NonNull MotionEvent event) {

            }

            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });

Answer 2

This answer is Kotlin version of @Astril Veliu's answer

yourRecyclerView.addOnItemTouchListener(object : RecyclerView.OnItemTouchListener {
            
            override fun onTouchEvent(view: RecyclerView, event: MotionEvent) {}
            
            override fun onInterceptTouchEvent(view: RecyclerView, event: MotionEvent): Boolean {
                when (event.action) {
                    MotionEvent.ACTION_DOWN -> {
                        yourRecyclerView.parent?.requestDisallowInterceptTouchEvent(true)
                    }
                }
                return false
            }
            
            override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {}
        })