我正在尝试安装flutter,并在visual studio代码上运行基本的flutter示例。我在命令行中使用了flutter doctor,并安装了所有缺少的要求,现在我尝试在flutter中运行一个基本程序,但在visual studio代码输出中,我得到以下错误
[Running] dart "c:\fluttercode\mobile_test1\lib\main.dart"
'dart' is not recognized as an internal or external command,
operable program or batch f
我正在使用flutter_bloc & bloc包来管理状态。 在子页面中,我正在初始化bloc &而在返回父页面时,我释放了bloc对象。 当我立即返回父页面时,阻塞抛出错误Unhandled Exception: Bad state: Cannot add new events after calling close,因为在加载时,在子页面上,我正在阻塞中调用api。api完成后的触发状态。此时已经阻止了对象的释放。 [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Bad state: C
我无法在VS Code中启动Dart Dev工具,当我在调试模式下启动时,它会打开一个chrome窗口,显示为Connect to a running app Enter a port or URL to a running Dart or Flutter application.
当我将鼠标悬停在Dart DevTools按钮上时,它显示了一个端口,但我仍然无法连接到它。
有什么想法吗?
嗨,我正在尝试读取QR代码并将QR代码中的数据发送到我的服务器。但是在运行flutter build ios时,我在启动应用程序时会看到xcode中的错误:
LateInitializationError: Field '_channel@598294394' has not been initialized.
#0 _QRViewState._channel (package:qr_code_scanner/src/qr_code_scanner.dart)
#1 _QRViewState.updateDimensions (package:qr_code
这里我要做的是使用VS Code构建我的flutter应用程序。当我运行以下命令flutter build apk时
FAILURE: Build failed with an exception.
* Where:
Build file 'F:\year-03\SEM2\events\GSOC\LabelLab\labellab_mobile\android\build.gradle' line: 27
* What went wrong:
A problem occurred evaluating root project 'android'.
>
代码:无法在web中创建数据库 var dbPath = p.current;
var dir = await Directory(dbPath).create(recursive: true);
var pa = p.join(dir.path, 'my_database.db');
DatabaseFactory dbFactory = databaseFactoryIo;
Database db = await dbFactory.openDatabase(pa);
var store = StoreRef.main();
await sto
为什么默认情况下ios/build不包括在gitignore中?
Untracked files:
(use "git add <file>..." to include in what will be committed)
ios/build/
/.gitignore文件
# Miscellaneous
*.class
*.log
*.pyc
*.swp
.DS_Store
.atom/
.buildlog/
.history
.svn/
# IntelliJ related
*.iml
*.ipr
*.iws
.idea/
# The .
我创建了一个flutter项目,并运行flutter packeages get,输出如下: second flutter packages get等待另一个flutter命令释放启动锁定……在秒内运行"flutter packages get“...当前的Dart SDK版本是2.0.0-dev.63.0.flutter-4c9689c1d2。
Because second depends on flutter_test any from sdk which requires SDK version <2.0.0, version solving failed.
pub get
我第一次尝试用默认的颤振项目启动Windows应用程序,但是它显示了这个错误,
Launching lib\main.dart on Windows in debug mode...
lib\main.dart:1
Can't load AOT data from {#project-path}\build\windows\runner\Debug\data\app.so; no such file.
Unable to start engine without AOT data.
Failed to create view controller.
Error waiting for
https://github.com/parse-community/Parse-SDK-Flutter 我正在尝试使用DART中的解析服务器Dart/Flutter SDK。在github页面上,字面上写着:“用于解析服务器的Dart或Flutter插件...享受吧!”\ 当我尝试导入依赖项并运行从github页面截取的简单代码时,我在vscode中得到以下依赖项错误: [test_parsie] pub get
Resolving dependencies...
Because every version of parse_server_sdk depends on flutter an
这两个插件都已安装,但无法访问android studio中的插件。即使已安装,也会显示以下错误
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 1.22.1, on Microsoft Windows [Version 10.0.18362.1082], locale en-IN)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[!] Androi
我更新了以下软件包:
firebase_core:从^0.5.0+1到^1.2.0
cloud_firestore:从0.14.1+3到^2.2.0
firebase_auth:从^0.18.0+1到^1.2.0
更新包后,我将得到以下错误:
═══════ Exception caught by widgets library ═══════════════════════════════════
The following StateError was thrown building StreamBuilder<QuerySnapshot<Object?&g