I'm having troubles with the error in the question title, followed the official flutter tutorial:

My code:

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
class Cloudtest extends StatefulWidget {
  const Cloudtest({Key? key}) : super(key: key);

  @override
  _CloudtestState createState() => _CloudtestState();
}

class _CloudtestState extends State<Cloudtest> {
  Widget _buildListItem(BuildContext context,DocumentSnapshot document){
    return ListTile(
      title: Text(document['name'])
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: StreamBuilder(
        stream: FirebaseFirestore.instance.collection('todo').snapshots(),
        builder: (context,AsyncSnapshot snapshot){
          if (!snapshot.hasData) return const Text('Loading...');
          return ListView.builder(
              itemCount: snapshot.data!.docs.length,
              itemBuilder: (context,index) =>
            _buildListItem(context,snapshot.data!.docs[index]),
          );
        }
      ),
    );
  }
}

What I expected to get was a list with the elements in the database, I call this page with a button in another flutter page, the rest of the app works fine. Any help aprecciated!

CodePudding user response：

You still need to extract the data out of the DocumentSnapshot, as in:

Widget _buildListItem(BuildContext context,DocumentSnapshot document){
    var data = document.data() as Map<String, dynamic>;
    return ListTile(
      title: Text(data['name'])
    );
  }

Also I don't see the name property in the Firebase document structure, you do have title and description, though.