【发布时间】：2020-10-03 16:11:30
【问题描述】：
** 我收到此错误**
Closure call with mismatched arguments: function '[]'
Receiver: Closure: (dynamic) => dynamic from Function 'get':.
Tried calling: []("url")
Found: [](dynamic) => dynamic
我从 Firestore 接收数据的代码是这样的..
import 'package:flutter/material.dart';
import 'package:riyazat_quiz/services/database.dart';
import 'package:riyazat_quiz/views/create_quiz.dart';
import 'package:riyazat_quiz/widgets/widgets.dart';
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
Stream quizStream;
DatabaseService databaseService = DatabaseService(); // this is to call the getQuizData() async{
return await FirebaseFirestore.instance.collection("Quiz").snapshots();
}
Widget quizList(){
return Container(
child: StreamBuilder(
stream:quizStream ,
builder: (context,snapshort){
return snapshort.data == null ? CircularProgressIndicator(): ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount : snapshort.data.documents.length ,
itemBuilder : (context,index){ return QuizTile(url:snapshort.data.documents[index].get['url'],
title:snapshort.data.documents[index].get['title'] ,
desc: snapshort.data.documents[index].get['desc'],);}
);
}
),
);
}
@override
void initState() {
databaseService.getQuizData().then((val){
setState(() {
quizStream =val;
});
});
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Center(
child: appBar(context),
),
backgroundColor: Colors.transparent,
elevation: 0.0,
brightness: Brightness.light,
),
body:
Column(
children: [
quizList(),
FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => CreateQuiz()));
},
),
],
),
);
}
}
class QuizTile extends StatelessWidget {
final String url,title,desc;
QuizTile({@required this.url,@required this.title,@required this.desc});
@override
Widget build(BuildContext context) {
return Container(
child: Stack(
children: [
Image.network(url),
Container(
child: Column(
children: [
Text(title),
Text(desc),
],
),
)
],
),
);
}
}
谁能告诉我哪里出错了
ps：这是一个测验应用程序，我从 Firestore 获取数据， 使用流。 保存在 firestore 上的数据有“url”、“title”、“desc”三个字段。 我想在下面的小部件中检索它们并希望将它们显示在堆栈中，但是这个错误让我陷入了两者之间。
【问题讨论】：
标签： firebase flutter dart google-cloud-firestore