class MySection extends Section {
    List<String> itemList = Arrays.asList("Item1", "Item2", "Item3");

    public MySection() {
        // call constructor with layout resources for this Section header and items
        super(SectionParameters.builder()
                .itemResourceId(R.layout.section_item)
                .headerResourceId(R.layout.section_header)
                .build());
    }

    @Override
    public int getContentItemsTotal() {
        return itemList.size(); // number of items of this section
    }

    @Override
    public RecyclerView.ViewHolder getItemViewHolder(View view) {
        // return a custom instance of ViewHolder for the items of this section
        return new MyItemViewHolder(view);
    }

    @Override
    public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
        MyItemViewHolder itemHolder = (MyItemViewHolder) holder;

        // bind your view here
        itemHolder.tvItem.setText(itemList.get(position));
    }
    
    @Override
    public RecyclerView.ViewHolder getHeaderViewHolder(View view) {
        // return an empty instance of ViewHolder for the headers of this section
        return new EmptyViewHolder(view);
    }
}

class MyItemViewHolder extends RecyclerView.ViewHolder {
    private final TextView tvItem;

    public MyItemViewHolder(View itemView) {
        super(itemView);

        tvItem = (TextView) itemView.findViewById(R.id.tvItem);
    }
}

// Create an instance of SectionedRecyclerViewAdapter
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();

// Add your Sections
sectionAdapter.addSection(new MySection());

// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);