日期: 2021 年 12 月 24 日

macOS Big Sur(11.6.2) Android Studio (version 2020.3) 执行 flutter doctor 报错

$ flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.22.5, on macOS 11.6.2 20G314 darwin-x64, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    ✗ 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 (Xcode 13.2.1)
[!] Android Studio (version 2020.3)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    ✗ Unable to find bundled Java version.
[!] IntelliJ IDEA Ultimate Edition (version 2018.3.6)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] VS Code (version 1.63.2)
[✓] Connected device (1 available)

! Doctor found issues in 3 categories.

在执行 flutter doctor --android-licenses 的时候报错：

$ 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

原因为 Java 版本太高，Flutter 1.22.5 只能使用 Java 1.8版本：

$ export JAVA_HOME=/Users/xxxx/Library/Java/JavaVirtualMachines/corretto-1.8.0_312/Contents/Home

$ flutter doctor --android-licenses

对于错误

[!] Android Studio (version 2020.3)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    ✗ Unable to find bundled Java version.

原因:

Plugin folder has changed in 4.1 version;
From : ~/Library/Application\ Support/AndroidStudio4.1
To: ~/Library/Application\ Support/Google/AndroidStudio4.1/plugins

Android Studio(4.1)后，安装插件的位置发生了变化，但是flutter doctor还是去原先的位置找，导致的安装过插件还报错。

解决方法：

$ ln -s ~/Library/Application\ Support/Google/AndroidStudio2020.3/plugins ~/Library/Application\ Support/AndroidStudio2020.3

更简单的方式是执行

$ flutter upgrade

升级到 flutter 2.8.1 以及之后的版本即可。

参考链接