如何从activity类更新recyclerview

RecyclerView recyclerView;

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

    recyclerView = findViewById(R.id.recyclerView);

    // 设置recyclerview的布局管理器和适配器
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setAdapter(adapter);
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    // 数据集合
    private List<String> data;

    // 构造方法
    public MyAdapter(List<String> data) {
        this.data = data;
    }

    // 创建ViewHolder
    @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);
    }

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

    // 返回数据集合大小
    @Override
    public int getItemCount() {
        return data.size();
    }

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

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

private void updateRecyclerView(List<String> newData) {
    // 更新数据集合
    adapter.setData(newData);
    // 刷新视图
    adapter.notifyDataSetChanged();
}