android - How do I create a circular (endless) RecyclerView?

Question

I am trying to make my RecyclerView loop back to the start of my list.

I have searched all over the internet and have managed to detect when I have reached the end of my list, however I am unsure where to proceed from here.

This is what I am currently using to detect the end of the list (found here):

 @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

        visibleItemCount = mLayoutManager.getChildCount();
        totalItemCount = mLayoutManager.getItemCount();
        pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();

        if (loading) {
            if ( (visibleItemCount+pastVisiblesItems) >= totalItemCount) {
                loading = false;
                Log.v("...", ""+visibleItemCount);
            }
        }
 }

When scrolled to the end, I would like to views to be visible while the displaying data from the top of the list or when scrolled to the top of the list I would display data from the bottom of the list.

For example:

View1 View2 View3 View4 View5

View5 View1 View2 View3 View4

Answer 1

There is no way of making it infinite, but there is a way to make it look like infinite.

1. in your adapter override getCount() to return something big like Integer.MAX_VALUE:

   @Override
   public int getCount() {
       return Integer.MAX_VALUE;
   }
   

2. in getItem() and getView() modulo divide (%) position by real item number:

   @Override
   public Fragment getItem(int position) {
       int positionInList = position % fragmentList.size();
       return fragmentList.get(positionInList);
   }
   

3. at the end, set current item to something in the middle (or else, it would be endless only in downward direction).

   // scroll to middle item
   recyclerView.getLayoutManager().scrollToPosition(Integer.MAX_VALUE / 2);