Nested RecyclerView expand/collapse function is not responding

Question

I have 2 RecyclerView (Vertical) one inside the other. Outer RecyclerView is having a List of Child and within this Inner, RecyclerView is having list of devices available to the specific child. The inner RecyclerView is having a condition that it should show 2 items for the first time and these are having a button on this button click the entire list of inner RecyclerView will be visible for the particular position(child). I have easily implemented the above scenario but facing 2 problems:

1. In Outer Recyclerview item click - only the last position item is expanding, on clicking to other position the item remain collapsed.
2. After scrolling expanded view automatically collapsed itself.

Below I am sharing my code :

1. Sending complete Child list to Outer Adapter.

   adapterHomeChildList.setList(responseChildList); // send list to the adapter.

2.Set list function and BindViewHolder of Outer Adapter

public void setList(List<UserWithDeviceListResponse> mChildLists) {
    childLists = new ArrayList<>();
    childLists = mChildLists;

    notifyDataSetChanged();
}

onBindViewHolder(....)

AdapterHomeDeviceList adapterHomeDeviceList = new AdapterHomeDeviceList(context);
    adapterHomeChildListBinding.setAdapter(adapterHomeDeviceList); // set inner device list adapter

    if (childLists.get(position).getDeviceList() != null && !childLists.get(position).getDeviceList().isEmpty()) {
        if (childLists.get(position).isExpanded()) {
            adapterHomeChildListBinding.setIsSeeMore(false);  // set see more button visibility
            adapterHomeDeviceList.setList(childLists.get(position).getDeviceList());
        } else {
            if (childLists.get(position).getDeviceList().size() > 2) {
                adapterHomeChildListBinding.setIsSeeMore(true);
                filter(childLists.get(position).getDeviceList(), adapterHomeDeviceList); // show top 2 item only
            } else {
                adapterHomeDeviceList.setList(childLists.get(position).getDeviceList());
            }
        }
    }

3. Item click interface handle

   private void setRecyclerViewExpanding(int position) { for (int i = 0; i < responseChildList.size(); i++) { if (position == i) { if (responseChildList.get(i).isExpanded()) { responseChildList.get(i).setExpanded(false); } else { responseChildList.get(i).setExpanded(true); } } else { responseChildList.get(i).setExpanded(false); } } adapterHomeChildList.notifyDataSetChanged(); }

I have searched so many questions related to this but mostly answers are using expandable listview but I am not using an expandable view. Please do help me. Any help will be really grateful.