Endless Scrolling RecyclerView — Easiest Approach

Activity.java

@Override
        public void onBindViewHolder(final ViewHolder holder, final int position) {

            ...

            // Load more - Endless Scrolling
            if(position == this.getItemCount() - 1)
            {
                // Add a progress bar.
                ProgressBar progressBar = new ProgressBar(context);
                progressBar.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
                linearLayout.addView(progressBar);

                // add more


                // Remove the progressbar.


                Toast.makeText(getApplicationContext(), "Loading", Toast.LENGTH_SHORT).show();
            }
          
          ...


        }