Flutter以列表的形式从firestore中检索数据

import 'package:cloud_firestore/cloud_firestore.dart';

// 获取Firestore实例
final FirebaseFirestore firestore = FirebaseFirestore.instance;

// 检索数据
Future<List<DocumentSnapshot>> fetchData() async {
  List<DocumentSnapshot> documents = [];
  
  try {
    // 执行查询操作
    QuerySnapshot querySnapshot = await firestore.collection('your_collection').get();
    
    // 获取查询结果
    documents = querySnapshot.docs;
  } catch (e) {
    print('Error retrieving data: $e');
  }
  
  return documents;
}

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<DocumentSnapshot>>(
      future: fetchData(),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return CircularProgressIndicator();
        } else if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          List<DocumentSnapshot> documents = snapshot.data;
          
          return ListView.builder(
            itemCount: documents.length,
            itemBuilder: (context, index) {
              DocumentSnapshot document = documents[index];
              
              // 在列表中显示数据
              return ListTile(
                title: Text(document['title']),
                subtitle: Text(document['subtitle']),
              );
            },
          );
        }
      },
    );
  }
}