Test

gistfile1.txt

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {

    private List<Model> items = new ArrayList<>();
    SparseBooleanArray itemStateArray= new SparseBooleanArray();
    Adapter() {
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        int layoutForItem = R.layout.list_item;
        LayoutInflater inflater = LayoutInflater.from(context);
        View view = inflater.inflate(layoutForItem, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.bind(position);
    }

    @Override
    public int getItemCount() {
        if (items == null) {
            return 0;
        }
        return items.size();
    }

    void loadItems(List<Model> tournaments) {
        this.items = tournaments;
        notifyDataSetChanged();
    }


    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        CheckedTextView mCheckedTextView;

        ViewHolder(View itemView) {
            super(itemView);
            mCheckedTextView = (CheckedTextView) itemView.findViewById(R.id.checked_text_view);
            itemView.setOnClickListener(this);
        }

        void bind(int position) {
            // use the sparse boolean array to check
            if (!itemStateArray.get(position, false)) {
                mCheckedTextView.setChecked(false);}
            else {
                mCheckedTextView.setChecked(true);
            }
            mCheckedTextView.setText(String.valueOf(items.get(position).getPosition()));
        }

        @Override
        public void onClick(View v) {
            int adapterPosition = getAdapterPosition();
            if (!itemStateArray.get(adapterPosition, false)) {
                mCheckedTextView.setChecked(true);
                itemStateArray.put(adapterPosition, true);
            }
            else  {
                mCheckedTextView.setChecked(false);
                itemStateArray.put(adapterPosition, false);
            }
        }

    }
}