如何在flutter中显示firestore数据中的文本？

import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

Firebase.initializeApp();
final firestoreInstance = FirebaseFirestore.instance;

StreamBuilder<QuerySnapshot>(
  stream: firestoreInstance.collection('collectionName').snapshots(),
  builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
    if (snapshot.hasError) {
      return Text('获取数据出错: ${snapshot.error}');
    }

    if (snapshot.connectionState == ConnectionState.waiting) {
      return Text('加载中...');
    }

    return ListView(
      children: snapshot.data.docs.map((DocumentSnapshot document) {
        return ListTile(
          title: Text(document.data()['text']),
        );
      }).toList(),
    );
  },
)