如何在android studio中使用recyclerview展示我的数据库？

implementation 'androidx.recyclerview:recyclerview:1.2.1'

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<DataItem> mDataList;

    public MyAdapter(List<DataItem> dataList) {
        mDataList = dataList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull 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(@NonNull ViewHolder holder, int position) {
        DataItem item = mDataList.get(position);
        holder.textView.setText(item.getText());
    }

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

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

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

public class DataItem {
    private String text;

    public DataItem(String text) {
        this.text = text;
    }

    public String getText() {
        return text;
    }
}

RecyclerView recyclerView = findViewById(R.id.recyclerView);
List<DataItem> dataList = getDataFromDatabase(); // 从数据库获取数据
MyAdapter adapter = new MyAdapter(dataList);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));