当我启动我的Flutter应用时,我得到了以下错误: ══╡ EXCEPTION CAUGHT BY FLUTTER FRAMEWORK ╞═════════════════════════════════════════════════════════
The following message was thrown:
Could not navigate to initial route.
The requested route name was: "/animals/cats/lolcats"
The following routes were therefore at
我正在实现一个api,它需要递归调用来获取所有数据。我已经实现了一个具有recursive transformer的Bloc组件。但是,在递归调用中,转换器似乎一直在返回一个空累加器。
comments_bloc.dart
class CommentsBloc {
final _repository = Repository();
final _commentsFetcher = PublishSubject<int>();
final _commentsOutput = BehaviorSubject<Map<int, Future<ItemMode
我正在使用authStateChanges().listen来查看用户何时登录或注销,以及应用程序应该将它们带到何处。但出于某种原因,我得到了以下错误。
E/flutter (29194): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: This widget has been unmounted, so the State no longer has a context (and should be considered defunct).
E/flutter (29194): Consider cance
在我点击按钮一次,然后再试着点击它,我会得到他的错误。请告诉我我做错了什么。谢谢!
import "package:flutter/material.dart";
import "historicalfigureinfo.dart";
void main() {
runApp(const MaterialApp(home: Hwk3()));
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widg
今天我更新了我经常使用的android模拟器,由于某种原因,我得到了这个错误。我已经更新了所有可能的依赖项和包。
I/FirebaseAuth(11346): [FirebaseAuth:] Preparing to create service connection to fallback implementation
W/System (11346): Ignoring header X-Firebase-Locale because its value was null.
E/flutter (11346): [ERROR:flutter/lib/ui/ui_dart_state.cc
启动后,我正在尝试处理我的应用程序的屏幕。
预期的路线是:
boot -> check if is logged in -> if yes -> navigator.push() to MainWindow.
boot -> check if is logged in -> no snapshot data -> navigator.push() to LoadingScreen.
boot -> check if is logged in -> if no -> navigator.push() to LoginScreen.
函数在Ma
在我的颤振应用程序(运行在Android模拟器上)的appBar中添加资产映像时,终端中反复出现以下异常:
══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════
The following assertion was thrown resolving an image codec:
Unable to load asset: /assets/images/small.png
When the exception was thrown, this
我刚刚开始学习flutter,并决定遵循一个教程。视频说我必须在路由工厂中使用MaterialPageRoute,并为我的路由声明全局常量,但我得到了这个错误 The following assertion was thrown building Builder(dirty):
The builder for route "/" returned null. 以下是我的代码 import 'package:flutter/material.dart';
import 'package:layout_in_flutter/screens/loca
当网络关闭时,我会收到以下消息。
E/flutter (26162): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: This widget has been unmounted, so the State no longer has a context (and should be considered defunct).
E/flutter (26162): Consider canceling any active work during "dispose" or using the &
我对flutter和firebase还是个新手,我一直在关注Reed Barger的指南“用Flutter和Firebase构建社交网络”。我已经成功地完成了与Google的身份验证,但我在Firestore中创建用户时遇到了问题。为此,方法是
createUserInFirestore() async {
//1) check if user exists in user's collection in database (according to their id)
final GoogleSignInAccount user = googleSignIn.curr
由于以下错误,我的应用程序停留在HandleMainScreen。它第一次导航正常,但在控制台中出现错误,但当我热重新启动它时,导航不起作用,应用程序停留在HandleMainScreen。 E/flutter ( 8785): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'findAncestorStateOfType' was called on null.
E/flutter ( 8785): Receiver: null