Exemplo de adapter para recyclerview

ExemploAdapter.java

public class ExemploAdapter extends RecyclerView.Adapter<ExemploAdapter.ExemploViewHolder> {

    private final ArrayList<Exemplo> exemploArrayList;
    private final Context context;

    private ExemploOnClickListener exemploOnClickListener;

    public ExemploAdapter(Context context, ArrayList<Exemplo> exemploArrayList, ExemploOnClickListener exemploOnClickListener) {
        this.context = context;
        this.exemploArrayList = exemploArrayList;
        this.exemploOnClickListener = exemploOnClickListener;
    }

    @Override
    public int getItemCount() {
        return this.exemploArrayList != null ? this.exemploArrayList.size() : 0;
    }

    @Override
    public ExemploViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.content_exemplo, viewGroup, false);

        ExemploViewHolder holder = new ExemploViewHolder(view);

        return holder;
    }

    @Override
    public void onBindViewHolder(final ExemploViewHolder holder, final int position) {
        //Atualiza a view
        Exemplo e = exemploArrayList.get(position);

        holder.tvExemplo.setText(a.getNome());

        //Click
        if (exemploOnClickListener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    exemploOnClickListener.onClickExemplo(holder.itemView, position);
                }
            });
        }
    }

    public interface ExemploOnClickListener {
        public void onClickExemplo(View view, int idx);
    }

    public class ExemploViewHolder extends RecyclerView.ViewHolder {
        TextView tvExemplo;

        public ExemploViewHolder(View view) {
            super(view);

            tvExemplo = (TextView) view.findViewById(R.id.card_tv_exemplo);
        }
    }
}