如何使用Flutter从Firebase数据库查询打印列表？

import 'package:flutter/material.dart';
import 'package:firebase_database/firebase_database.dart';

class FirebaseQueryList extends StatefulWidget {
  @override
  _FirebaseQueryListState createState() => _FirebaseQueryListState();
}

class _FirebaseQueryListState extends State<FirebaseQueryList> {
  final databaseReference = FirebaseDatabase.instance.reference();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firebase Query List'),
      ),
      body: FutureBuilder(
        future: databaseReference.child('your_collection').once(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            if (snapshot.hasData) {
              // 将查询结果转换为列表
              List<dynamic> dataList = snapshot.data.value;
              return ListView.builder(
                itemCount: dataList.length,
                itemBuilder: (context, index) {
                  // 构建列表项并打印数据
                  return ListTile(
                    title: Text(dataList[index]['title']),
                    subtitle: Text(dataList[index]['description']),
                  );
                },
              );
            } else {
              return Text('No data available');
            }
          } else {
            return CircularProgressIndicator();
          }
        },
      ),
    );
  }
}