How do I create a circular (endless) RecyclerView?

The other solutions i found for this problem work well enough, but i think there might be some memory issues returning Integer.MAX_VALUE in getCount() method of recycler view.

To fix this, override getItemCount() method as below :

@Override
public int getItemCount() {
    return itemList == null ? 0 : itemList.size() * 2;
}

Now wherever you are using the position to get the item from the list, use below

position % itemList.size()

Now add scrollListener to your recycler view

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
        super.onScrolled(recyclerView, dx, dy);
        int firstItemVisible = linearLayoutManager.findFirstVisibleItemPosition();
        if (firstItemVisible != 0 && firstItemVisible % itemList.size() == 0) {
            recyclerView.getLayoutManager().scrollToPosition(0);
        }
    }
});

Finally to start auto scrolling, call the method below

public void autoScroll() {
    final Handler handler = new Handler();
    final Runnable runnable = new Runnable() {
        @Override
        public void run() {
            recyclerView.scrollBy(2, 0);
            handler.postDelayed(this, 0);
        }
    };
    handler.postDelayed(runnable, 0);
}

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);