我想做一个页面,显示一个2分钟的计时器,然后用户可以点击按钮,然后转到下一页。为此,我使用了TweenAnimationBuilder,只要定时器不是0,它就能正常工作。一旦它变为零,它就会给出以下错误。
======== Exception caught by widgets library =======================================================
The following _CastError was thrown building TweenAnimationBuilder<num>(duration: 120000ms
你好,当我试图运行代码时,我收到了这个错误
以下是完整的错误:
======== Exception caught by widgets library =======================================================
The following NoSuchMethodError was thrown building LoginScreen(dirty):
Closure call with mismatched arguments: function 'LoginScreen.build.<anonymous closu
我有一个子字符串命令,我想用手机号码的0替换前4位数字。
final String _cellPhone;
@override
Widget build(BuildContext context) {
final _cellPhoneShort = '0' '${_cellPhone.substring(4)}';
这也是string.dart当前文档中包含的内容。
/// The substring of this string from [start],inclusive, to [end], exclusive.
///
Another exception was thrown: Assertion failed:
Another exception was thrown: Assertion failed: file:///home/builder/hotbuilder/packages/flutter/lib/src/widgets/navigator.dart:4564:12
Another exception was thrown: Assertion failed: file:///home/builder/hotbuilder/packag
最近我一直在更新个人资料。下面是一个场景,HomePage => => Profile => HomePage。当我回来的时候,这就是我得到的错误。
⡿flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following assertion was thrown building BlocListener<HomeBloc, HomeState>(dirty, state
在过去的两天里,我在flutter项目中看到了这个错误'_elements.contains(element)': is not true.,它从一开始就工作得很好。我很抱歉这么说,但我对这个错误一无所知,但我想我遗漏了一些导致这个错误的东西。此外,当我热重载同一页面时,布局会被填充,但会抛出异常。
有时也会显示检测到重复的GlobalKeys(),但一开始并不是这样。
如果他们之前偶然发现了这些错误,请谁来帮助我。我真的不能写一个例子来重现同样的问题。非常感谢。
我给出的错误详细信息如下:
Performing hot reload...
I/flutter (22248):
我希望你们今天都过得很愉快!每当我在Flutter中的Messenger应用程序的搜索栏中搜索用户时,我都会得到以下错误: ======== Exception caught by widgets library =======================================================
The following StateError was thrown building:
Bad state: field does not exist within the DocumentSnapshotPlatform
When the exceptio
我有一个计时器,它有一个小动画,它周围是一个圆圈。定时器是从另一个启动路由(ExamTimer(size: 40.0),)调用的。当我导航到另一条路径时,会出现以下错误:
════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown while finalizing the widget tree:
ExamTimerState#c1b45(tickers: tracking 1 tic
我正在尝试检查用户是在Iphone上还是在Android上 我正在关注这篇文章来查看 How do you detect the host platform from Dart code? 在我的initState中,我添加了以下检查 typeOfDevice = Theme.of(context).platform == TargetPlatform.iOS
? "1"
: "2"; 但是,每当我尝试使用它时,我都会得到以下错误 I/flutter (22330): ══╡ EXCEPTION CAUGHT BY WIDGET
根据此实现颤振的Firebase
在“使用AnimatedList”步骤之后,我遇到了一个错误。一切似乎都符合教程- Firebase数据库插件中的版本差异是否会导致这种情况?
代码:
new Flexible(
child: new FirebaseAnimatedList(
query: reference,
sort: (a, b) => b.key.compareTo(a.key),
padding: new EdgeInsets
当我从一个小部件导航到另一个小部件时,我遇到了这个问题,我搜索了一下,我发现我应该用(FloatActionButton)添加(heroTag),但我没有这个小部件,这是问题消息:
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
There are multiple heroes that share the sam
我的代码: import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:multi_select_flutter/multi_select_flutter.dart';
import 'package:shared_preferences/shared_preferences.dart';
class Item {
final int id;
final String name;
Item({
this.i