问题描述
[![在此处输入图像描述][1]][1] 我需要在这里这样做: [1]:https://i.stack.imgur.com/bNdZ3.png
但是我做不到。我尝试了一些东西,但它不起作用。下面是我的 main.dart。我创建了用于显示图像的 showImage 方法,我也通过 Image.network(url) 应用了它;代码但它不起作用,所以我评论了它。
import 'package:firebase_storage/firebase_storage.dart';
import 'package:Flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',theme: ThemeData(
primarySwatch: Colors.red,visualDensity: VisualDensity.adaptivePlatformDensity,),home: MyHomePage(title: 'Flutter Demo Home Page'),);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key,this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
var url;
void _incrementCounter() {
setState(() {
_counter++;
});
}
void showImage() async {
final ref = FirebaseStorage.instance.ref().child('erkekyuz');
// no need of the file extension,the name will do fine.
url = await ref.getDownloadURL();
print(url);
}
Widget _buildListItem(BuildContext context,DocumentSnapshot document) {
String mezunD;
if (document.data()['mezunDurumu'] == false) {
mezunD = "mezun değil";
}
if (document.data()['mezunDurumu'] == true) {
mezunD = "mezun değil";
}
var listTile = ListTile(
title: Column(
children: [
Expanded(
child: Text(
"Ad Soyad: " + document.data()['adSoyad'],Expanded(
child: Text(
"Yaş: " + document.data()['yas'].toString(),Expanded(
child: Text(
"Doğum Tarihi: " + document.data()['dogumTarihi'],Expanded(
child: Text("Mezun Durumu: " + mezunD),//Image.network(url),//this didn't work somehow.
],);
return listTile;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Öğrenci Durumu"),body: StreamBuilder(
stream: FirebaseFirestore.instance.collection('tablolar').snapshots(),builder: (context,snapshot) {
if (!snapshot.hasData) return const Text('Loading...');
return ListView.builder(
itemExtent: 100.0,itemCount: snapshot.data.documents.length,itemBuilder: (context,index) =>
_buildListItem(context,snapshot.data.documents[index]),);
}),);
}
}
解决方法
您的 url 变量是否显示任何值? 像这样调用你的 showImage() 方法来加载图像。
@override
void initState() {
super.initState();
showImage();
}
用于显示图像,您可以使用:https://pub.dev/packages/cached_network_image