如何获取android studio实时数据库的所有数据FirebaseRecylerAdapter？

implementation 'com.google.firebase:firebase-database:20.0.0'
implementation 'com.firebaseui:firebase-ui-database:7.2.0'

public class MyAdapter extends FirebaseRecyclerAdapter<DataModel, MyAdapter.ViewHolder> {

    public MyAdapter(@NonNull FirebaseRecyclerOptions<DataModel> options) {
        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull ViewHolder holder, int position, @NonNull DataModel model) {
        // 绑定数据到ViewHolder
        holder.bindData(model);
    }

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

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

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

        public void bindData(DataModel model) {
            // 将数据绑定到视图
            textView.setText(model.getData());
        }
    }
}

FirebaseRecyclerOptions<DataModel> options = new FirebaseRecyclerOptions.Builder<DataModel>()
        .setQuery(databaseReference, DataModel.class)
        .build();

MyAdapter adapter = new MyAdapter(options);
recyclerView.setAdapter(adapter);

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}