我刚开始接触Flutter,在我的web应用程序上的页面导航遇到了困难,特别是当我从页面1导航到页面2时,每当我试图返回(无论是浏览器中的后退按钮还是自动创建的应用程序栏中的后退按钮),我都会得到一个IndexError,应用程序崩溃。我正在尝试使用Navigator.push,但这似乎不起作用。 RangeError (index): Index out of range: index should be less than 6: 6
When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_
我正在让颤振 Stepper,我正在尝试在其中一个步骤中使用TabBar与TabBarView,但是我得到了下面的错误
======== Exception caught by rendering library =====================================================
The following assertion was thrown during performResize():
Horizontal viewport was given unbounded height.
Viewports expand in the cross a
我使用Hive在expenseBox中存储日常开支如下:
final String now = DateFormat('yyyyMMdd').format(DateTime.now());
List<Expense> todaysExpenses = Hive.box<List<Expense>>('expenses').get(now, defaultValue: []) as List<Expense>;
todaysExpenses.add(expense);
expenseBox.put(now, toda
我查看了运球,看到了一个具有全景效果的漂亮的图像显示,我想我应该用carousel_slider插件和全景插件复制相同的效果,令人惊讶的是,它在移动上运行得很好,但在颤振网络上、在网络上、临时开始工作、几秒钟后就变成空白。请查找下面的代码和错误响应。
class _SampleProductCarouselState extends State<SampleProductCarousel> {
final String imagePath = 'assets/carousel/';
int _current = 0;
final CarouselCont
我接管了一个大项目,随着数据库变得越来越大,一些代码停止了工作,
下面的查询用于查找那些最后一个rending_log为pending的rendering_requests,有时有一些日志条目没有状态更改,并且记录为noaction,我们不需要对它们进行计数。这就是我从查询中理解的。
SELECT
COUNT(rr.rendering_id) AS recordCount
FROM
rendering_request rr, rendering_log rl
WHERE
rl.rendering_id = rr.rendering_id
AND rl.status =
我是一个新的颤音,所以我试图创建一个幻灯片在我的列表视图,以允许编辑一些信息。我找到了一个名为flutter_slidable的库,我正在尝试使用它。该代码与可解雇组件工作良好,但我不希望它被丢弃,只是滑动。当我更改组件以使用可滑动组件时,我开始得到以下错误:
======== Exception caught by widgets library =======================================================
The following assertion was thrown building _SizeTransition(animatio
我上传了一个用户的个人资料图片,这是存储在防火墙存储。然后,在我的应用程序中,我使用图像的url从防火墙存储中检索图像,但是图像没有加载,它会抛出异常。
I/flutter (32361): ══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════
I/flutter (32361): The following _Exception was thrown resolving an image codec:
I/flutter (32361): Exc
我想做一个应用程序,显示不同的产品和他们的健康,但遇到了这个问题。Main.dart会显示,但list.dart不会显示。我是在Android编程的,我是初学者,对颤振、Dart或Android不太了解。
错误:
The following assertion was thrown during performLayout():
RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
This probably means that it is a render object that
因此,每当我通过Google登录时,我都会得到以下错误,但我只在第一次登录时才得到它。如果我注销并重新登录,它永远不会出现,应用程序运行良好。
======== Exception caught by widgets library =======================================================
The following StateError was thrown building:
Bad state: field does not exist within the DocumentSnapshotPlatform
When the
我用Python创建了一个游戏,我正在尝试重新创建它。它有一个网格布局板4x3,就像这个图像:
我在想,我想用带有儿童Ink.image的材料来显示棋盘。
我的代码:
/*- Main method --------------------------------------------------- */
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Cat A
我尝试在SingleChildScrollView中使用ReorderableListView,但收到一个错误:
I/flutter ( 9049): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 9049): The following assertion was thrown during performLayout():
I/flutter ( 9049): BoxConstraints forces an i
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
我对自己如此赤裸裸地飞来飞去是很陌生的。
我开始学习颤振,我有以下情况。基于main.dart中给定的值,我想要生成图像。
我现在有以下代码:
import 'package:flutter/material.dart';
class FireChar extends StatelessWidget {
// The amount of Characters are going to be created
final double amount;
FireChar({this.amount});
@override
Widget build(Bui
我有一门课看起来是这样的:
public class Content {
public enum Type {
TEXT, URL, FILE
}
public enum Rendering {
MARKDOWN, HTML, PLAIN, AUTO
}
public final Type type;
public final Rendering rendering;
public final String content;
我正在写一个应用程序使用的要求。我编写的一些模块只是在多个组件中加载,以便更容易地访问。当我通过requirejs优化器运行我的应用程序时,这些模块会导致以下错误:
The following modules share the same URL. This could be a misconfiguration if that URL only has one anonymous module in it:
F:/nemesis/nemesis/src/nemesis.js: nemesis, nemesis
F:/nemesis/nemesis/src/_nemesis.js: _neme
我一直试图将我的firebase数据库中的数据显示到Flutter应用程序中,但总是出错,有人知道原因和解决方案吗?当我添加检查快照是否有数据的检查时,我通常不会得到错误,我编写的程序只在没有数据的情况下显示Container()。但是,当我后来尝试添加orderBy查询时,我意识到出现了这个错误,因为我应该得到一个指向数据库的复合索引的链接的错误,但是没有接收到它,所以尝试了一整天,我认为在它之前一定有一个错误,所以一旦我取消了检查快照是否有数据,这个错误就会显示出来,所以我必须首先修复这个错误,才能转到orderBy部分。谢谢!以下是代码 class ChatBody extends S
我目前正在学习Flutter,我正在尝试使用Stack中的定位小部件在屏幕底部定位一个旋转木马。目前,堆栈是一个地图,其上是旋转木马。当我使用定位的小部件将圆盘传送带移动到底部时,它消失了,我遇到了这个错误。 I/flutter (19228): Another exception was thrown: 'package:flutter/src/rendering/object.dart': Failed assertion: line 1578 pos 12: '!_debugDoingThisLayout': is not true.
I/flu