为什么我的RecycleView不能正常工作？

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private MyAdapter adapter;
    private List<MyData> dataList;

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

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        dataList = new ArrayList<>();
        // 添加数据到dataList

        adapter = new MyAdapter(dataList);
        recyclerView.setAdapter(adapter);
    }
}

class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private List<MyData> dataList;

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

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.bind(dataList.get(position));
    }

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

    static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

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

        public void bind(MyData data) {
            textView.setText(data.getText());
        }
    }
}