如何根据所选项目更改RecyclerView下的信息？

// 1. 创建适配器类
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<String> dataList;

    public MyAdapter(List<String> dataList) {
        this.dataList = dataList;
    }

    // 2. 创建ViewHolder
    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }

    // 3. 实现必要的方法
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        String data = dataList.get(position);
        holder.textView.setText(data);
    }

    @Override
    public int getItemCount() {
        return dataList.size();
    }
}

// 在Activity或Fragment中使用RecyclerView
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private MyAdapter adapter;
    private List<String> dataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化RecyclerView
        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        // 初始化数据集合
        dataList = new ArrayList<>();
        dataList.add("Item 1");
        dataList.add("Item 2");
        dataList.add("Item 3");

        // 初始化适配器
        adapter = new MyAdapter(dataList);
        recyclerView.setAdapter(adapter);
    }

    // 当所选项目发生变化时，更新数据集合中的数据
    private void updateData() {
        dataList.clear();
        dataList.add("New Item 1");
        dataList.add("New Item 2");
        dataList.add("New Item 3");

        // 通知适配器数据发生变化
        adapter.notifyDataSetChanged();
    }
}