Android 工具链 - 我为 Android 设备开发（Android SDK 版本 30.0.3）：
X cmdline-tools component is missing
Run `path/to/sdkmanager --install "cmdline-tools;latest"`
See https://developer.android.com/studio/command-line for more details.
我正在构建一个 Flutter 应用程序并且我已经集成了 Firebase，但是当我点击一个按钮来注册、登录或注销时，我不断收到这个错误。我见过其他人问过同样的问题，但似乎没有一个对我有用。我正在使用 Flutter 和Android Studio。我该如何解决这个问题？
这是我的代码的摘录
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.red,
body: Center(
child: Container(
child: RaisedButton(
onPressed: () {
FirebaseAuth.instance.signOut().then((value) {
Navigator.pushReplacement(
context,
MaterialPageRoute(
builder: (context) =>
LoginScreen()));
});
},
child: Text("Logout"),
)
)
)
);
}
}
下面是抛出的异常
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> { …Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 5 more
运行 flutter doctor --android-licenses 时出现上述错误。有谁知道为什么会发生这种情况以及我该如何解决？我已经在颤振控制台上运行它。
我正在使用 flutter、android studio 和 firebase 运行最新的 OSX/Flutter/XCode 版本，1 小时前一切正常。
然后我重新启动了我的 MacBook，当我尝试启动 ios 模拟器时，我收到此错误“无法启动模拟器”。
以下步骤显示无解决方案：
我也在 stackoverflow 上发现了这个问题，但所有建议都不起作用。
有任何想法吗？
我注意到我的项目中出现了新的 lint 问题。
长话短说：
我需要在我的自定义类中使用 BuildContext
flutter lint 工具与 aysnc 方法一起使用时并不满意。
例子：
MyCustomClass{
final buildContext context;
const MyCustomClass({required this.context});
myAsyncMethod() async {
await someFuture();
# if (!mounted) return; << has no effect even if i pass state to constructor
Navigator.of(context).pop(); # << example
}
}
dart flutter flutter-dependencies flutter-state flutter-build
我已经安装了 Android Studio Canary2020.3.1.22并尝试Flutter在Apple Silicon(ARM) Mac. 不幸的是，当我尝试运行default颤振计数器应用程序时，它给了我这个错误。
这是我收到的错误：
Could not open settings generic class cache for settings file '/Users/khamidjonkhamidov/StudioProjects/dummy/android/settings.gradle' (/Users/khamidjonkhamidov/.gradle/caches/6.7/scripts/f0emg6u6oecmxqzgk5g9nn4ui).
> BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 61
Gradle version: 6.7但我尝试了 7+ JDK 版本17
我将衷心感谢您的帮助）
我刚刚将我的 flutter 项目包更新为空安全兼容，现在 Android Studio 希望我更新我的项目以使用最新版本的 Kodling Gradle 插件。但看不出在哪里可以改变这一点。我尝试过改变，"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"但这"org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.10"没有效果。
我的build.grade文件如下所示：
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) …如何在flutter中删除调试横幅？
我正在使用flutter screenshot,我希望屏幕截图没有横幅.现在确实有.
请注意,我收到not supported for emulator了配置文件和发布模式的消息.
我有一个 Flutter 项目，我试图在 iOS 上运行。它在我的基于 Intel 的 Mac 上正常运行，但在我新的基于 Apple Silicon 的 M1 Mac 上它无法安装 pod。
LoadError - dlsym(0x7f8926035eb0, Init_ffi_c): symbol not found - /Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi_c.bundle
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi.rb:6:in `rescue in <top (required)>'
/Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi.rb:3:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/ethon-0.12.0/lib/ethon.rb:2:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/typhoeus-1.4.0/lib/typhoeus.rb:2:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:74:in `cdn_url?'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:36:in `create_source_with_url'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:21:in `find_or_create_source_with_url'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:178:in `block in sources'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:177:in `map'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:177:in `sources'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:1073:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:1072:in `resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer.rb:414:in …突然间，我在我的 Android 项目中遇到了这个构建错误：
unexpected element <queries> found in <manifest>
我如何解决它？
android manifest android-manifest android-gradle-plugin flutter