无法显示使用Listview.Builder和ListTile从Firestore下载的数据

import 'package:cloud_firestore/cloud_firestore.dart';

final FirebaseFirestore firestore = FirebaseFirestore.instance;

Stream<QuerySnapshot> getData() {
  return firestore.collection('your_collection').snapshots();
}

StreamBuilder<QuerySnapshot>(
  stream: getData(),
  builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
    if (snapshot.hasError) {
      return Text('Error: ${snapshot.error}');
    }

    if (snapshot.connectionState == ConnectionState.waiting) {
      return CircularProgressIndicator();
    }

    return ListView.builder(
      itemCount: snapshot.data.docs.length,
      itemBuilder: (BuildContext context, int index) {
        DocumentSnapshot document = snapshot.data.docs[index];
        return ListTile(
          title: Text(document['title']),
          subtitle: Text(document['subtitle']),
        );
      },
    );
  },
);