解决flutter doctor出现Android license status unknown或cmdline-tools component is missing

原创已于 2022-09-01 10:12:19 修改 · 4.2k 阅读

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#android #flutter #toolchain #android sdk #android license

于 2021-10-13 17:00:16 首次发布

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本文讲述了开发者在使用Flutter进行环境检查时遇到的Android SDK问题，包括`cmdline-tools`组件缺失和Java异常。通过在Android Studio中安装SDK命令行工具并接受许可，成功解决了这些问题，确保了开发环境的完整。

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问题描述

使用flutter doctor检查开发环境，出现以下问题

wangyangyangdeMacBook-Pro:~ wangyang$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.2.1, on Mac OS X 10.15.7 19H2 darwin-x64, locale
    zh-Hans-US)
[!] Android toolchain - develop for Android devices (Android SDK version 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.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.2)
[✓] VS Code (version 1.61.0)
[✓] Connected device (2 available)

! Doctor found issues in 1 category.

根据错误提示运行flutter doctor --android-licenses，出现以下Java异常。

wangyangyangdeMacBook-Pro:~ wangyang$ flutter doctor --android-licenses
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:522)
	... 5 more

虽然这个错误不影响在Android上的编译和运行，但是本人是个强迫症，必须消灭掉！！！

解决方案

根据上面的错误显示，猜测难道是Android SDK的问题？

打开Android Studio, Preferences-Appearance & Behavior- System Settings- Android SDK-SDK Tools

发现SDK的命令行工具没有安装。
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勾选，然后选择Apply，会出现安装提示.

在这里插入图片描述
点击OK，会出现安装进度。

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安装完成后，再次运行flutter doctor，已经没有错误了。OK 完美！

wangyangyangdeMacBook-Pro:~ wangyang$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.2.1, on Mac OS X 10.15.7 19H2 darwin-x64, locale
    zh-Hans-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.2)
[✓] VS Code (version 1.61.0)
[✓] Connected device (2 available)

• No issues found!