Flutter 颤振:确保首先调用FirebaseApp.initializeApp(上下文)
我正在编写一个flatter应用程序,并试图在Firebase存储上上载一个图像。这是我创建的一个简单的测试应用程序,用于重现错误Flutter 颤振:确保首先调用FirebaseApp.initializeApp(上下文),flutter,firebase-storage,Flutter,Firebase Storage,我正在编写一个flatter应用程序,并试图在Firebase存储上上载一个图像。这是我创建的一个简单的测试应用程序,用于重现错误 import 'dart:io'; import 'package:flutter/material.dart'; import 'package:flutter/services.dart' show rootBundle; import 'package:path_provider/path_provider.dart'; import 'package:fi
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'package:path_provider/path_provider.dart';
import 'package:firebase_storage/firebase_storage.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
File image;
Future<File> getImageFileFromAssets(String path) async {
final byteData = await rootBundle.load('assets/$path');
final file = File('${(await getTemporaryDirectory()).path}/$path');
await file.writeAsBytes(byteData.buffer
.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));
return file;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Test App'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
height: 300,
width: 450,
child: image == null ? null : Image.file(image),
),
RaisedButton(
child: Text('Submit'),
onPressed: () async {
final fileName = 'imageName';
final firebaseStorageRef =
FirebaseStorage.instance.ref().child('userFolder');
final uploadTask =
firebaseStorageRef.child(fileName).putFile(image);
await uploadTask.onComplete;
},
),
RaisedButton(
child: Text('Load immagine'),
onPressed: () async {
image = await getImageFileFromAssets('test.jpg');
setState(() {});
},
),
],
),
),
);
}
}
数据库的规则是公共规则:
rules_version = '2';
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write;
}
}
}
有人能告诉我我做错了什么吗?对于来到这里的人,我解决了这个问题。有很多事情要做,比如将你的应用程序添加到你的Firebase项目和编辑一些文件。 唯一要做的是更好地阅读文档并遵循所有步骤:
根据文档,只需更改您的主要方法:
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
Future main()异步{
WidgetsFlutterBinding.ensureInitialized();
等待Firebase.initializeApp();
runApp(MyApp());
}
导入“包:firebase_core/firebase_core.dart” 所有Firebase版本都已更新,现在您必须在使用任何Firebase产品之前调用Firebase.initializeApp(),例如:
首先,所有Firebase产品现在都依赖于Firebase_核心版本(0.5.0+),因此您需要将其添加到pubspec.yaml文件中:
dependencies:
flutter:
sdk: flutter
firebase_core : ^0.5.0
然后必须调用Firebase.initializeApp():
在main.dart中:
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(); //Make sure you imported firebase_core
runApp(MaterialApp(
home: GettingStartedPage(),
));
}
Future main()异步{
WidgetsFlutterBinding.ensureInitialized();
等待Firebase.initializeApp();//确保已导入Firebase_核心
runApp(材料应用程序)(
主页:GettingStartedPage(),
));
}
谢谢!我有这个,但我忘了等待!Lol将一个已经在工作的项目中的代码复制到一个新的应用程序中,却忘了重新设置所有内容。谢谢虽然此代码可能会回答此问题,但提供有关如何和/或为什么解决此问题的附加上下文将提高答案的长期价值。所有Firebase版本都已更新,现在您必须在使用任何Firebase产品之前调用Firebase.initializeApp(),例如:First,所有Firebase产品现在都依赖于Firebase_核心版本(0.5.0+),因此您需要将其添加到pubspec.yaml文件中
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(); //Make sure you imported firebase_core
runApp(MaterialApp(
home: GettingStartedPage(),
));
}