如何将firebase云数据显示为表格并显示图像

Question

[！[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

但我做不到。我试过一些东西，但不起作用。下面是我的主页。我创建了showImage方法来显示图像，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]),
);
}),
);
}
}

Answer 1

您的url变量是否显示任何值？像这样调用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