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$ 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：
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$ 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：
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$ export JAVA_HOME=/Users/xxxx/Library/Java/JavaVirtualMachines/corretto-1.8.0_312/Contents/Home $ flutter doctor --android-licenses |
对于错误
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[!] 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:
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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：
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$ ln -s ~/Library/Application\ Support/Google/AndroidStudio2020.3/plugins ~/Library/Application\ Support/AndroidStudio2020.3 |
更简单的方式是执行
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$ flutter upgrade |
升级到 flutter 2.8.1 以及之后的版本即可。