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dart - 如何在返回上一屏幕时捕捉值(value)?

这是我的第二堂课classSecondClassextendsStatefulWidget{_SecondClassStatecreateState()=>_SecondClassState();}class_SecondClassStateextendsState{@overrideWidgetbuild(BuildContextcontext){ReturnContainer(RaisedButton(onPressed:Navigator.of(context).pop('loremipsum),child:Text('Backandgetdata')));}}这是我的第一个类c

dart - 如何在返回上一屏幕时捕捉值(value)?

这是我的第二堂课classSecondClassextendsStatefulWidget{_SecondClassStatecreateState()=>_SecondClassState();}class_SecondClassStateextendsState{@overrideWidgetbuild(BuildContextcontext){ReturnContainer(RaisedButton(onPressed:Navigator.of(context).pop('loremipsum),child:Text('Backandgetdata')));}}这是我的第一个类c

flutter - RangeError(索引): Invalid value: Not in range 0. .8,包括 : 9 in Gridview. 计数

我找到了解决方案ListView.builder“您应该将itemCount参数传递给ListView.builder以允许它知道项目计数”但不适用于GridView.count。抛出另一个异常:RangeError(index):Invalidvalue:Notinrange0..8,inclusive:9import'package:thunder_mobile/screens/dashboard-page/common-list-page/common_list.dart';import'package:thunder_mobile/screens/dashboard-page/

flutter - RangeError(索引): Invalid value: Not in range 0. .8,包括 : 9 in Gridview. 计数

我找到了解决方案ListView.builder“您应该将itemCount参数传递给ListView.builder以允许它知道项目计数”但不适用于GridView.count。抛出另一个异常:RangeError(index):Invalidvalue:Notinrange0..8,inclusive:9import'package:thunder_mobile/screens/dashboard-page/common-list-page/common_list.dart';import'package:thunder_mobile/screens/dashboard-page/

python selenium报错ValueError: Timeout value connect was <...>, but it must be an int, float or None.

pythonselenium报错ValueError:Timeoutvalueconnectwas<…>,butitmustbeanint,floatorNone.因更换系统,重新安装了selenium。命令:pipinstallselenium默认版本为selenium4,版本不太兼容,所以卸载:pipuninstallselenium更换为旧版本:pipinstallselenium==3.141.0安装完以后显示:Successfullyinstalledselenium-3.141.0urllib3-2.0.2(坑出现了)运行一下代码以后报错:fromseleniumimportweb

firebase - flutter + 火力地堡 | java.lang.IllegalStateException : FirebaseApp with name [DEFAULT] doesn't exist 错误

我正在尝试通过连接我的基本Flutter应用到CloudFirestore(在Firebase中)来完成一个非常简单的练习。我已按照有关设置的说明进行操作。但是,我收到以下错误。E/MethodChannel#plugins.flutter.io/cloud_firestore(13217):FailedtohandlemethodcallE/MethodChannel#plugins.flutter.io/cloud_firestore(13217):java.lang.IllegalStateException:FirebaseAppwithname[DEFAULT]doesn't

firebase - flutter + 火力地堡 | java.lang.IllegalStateException : FirebaseApp with name [DEFAULT] doesn't exist 错误

我正在尝试通过连接我的基本Flutter应用到CloudFirestore(在Firebase中)来完成一个非常简单的练习。我已按照有关设置的说明进行操作。但是,我收到以下错误。E/MethodChannel#plugins.flutter.io/cloud_firestore(13217):FailedtohandlemethodcallE/MethodChannel#plugins.flutter.io/cloud_firestore(13217):java.lang.IllegalStateException:FirebaseAppwithname[DEFAULT]doesn't

flutter - 未处理的异常 : RangeError (index): Invalid value: Valid value range is empty: 0

此方法始终运行。我检查了API。如果API值发生变化,我会删除我的数据库并重新插入。像这种情况那样使用是正确的方法吗?(可以使用streamWidget还是FutureWidget?如果可以怎么办?)错误信息:[ERROR:flutter/lib/ui/ui_dart_state.cc(148)]UnhandledException:RangeError(index):Invalidvalue:Validvaluerangeisempty:0checkQuick(Stringurl,Stringtoken)async{result=(awaitHelperDatabase1().dis

flutter - 未处理的异常 : RangeError (index): Invalid value: Valid value range is empty: 0

此方法始终运行。我检查了API。如果API值发生变化,我会删除我的数据库并重新插入。像这种情况那样使用是正确的方法吗?(可以使用streamWidget还是FutureWidget?如果可以怎么办?)错误信息:[ERROR:flutter/lib/ui/ui_dart_state.cc(148)]UnhandledException:RangeError(index):Invalidvalue:Validvaluerangeisempty:0checkQuick(Stringurl,Stringtoken)async{result=(awaitHelperDatabase1().dis

RabbitMQ消费端报:delivery acknowledgement on channel 5 timed out. Timeout value used: 1800000 ms. This t

场景:消费端日志控制台报如下错误:2022-11-2513:18:29.354ERROR13368---[.15.178.36:5672]o.s.a.r.c.CachingConnectionFactory:1575-Channelshutdown:channelerror;protocolmethod:#method(reply-code=406,reply-text=PRECONDITION_FAILED-deliveryacknowledgementonchannel5timedout.Timeoutvalueused:1800000ms.Thistimeoutvaluecanbecon