【发布时间】：2020-08-07 17:59:10
【问题描述】：
我是 Flutter 开发的新手。我刚刚开始。我参加了 App Brewery 的 Flutter 简介课程。我按照课程中给出的说明以及flutter.dev网站上的说明执行了所有步骤。运行后
C:\Users\hashim irfan>flutter doctor
在命令提示符下。给出的输出是
[√] Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [Version 10.0.18363.752], locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
X Android license status unknown.
Try re-installing or updating your Android SDK Manager.
See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.
[√] Android Studio (version 3.6)
[√] VS Code (version 1.44.1)
[!] Connected device
! No devices available
! Doctor found issues in 2 categories.
我该如何解决这个问题？
我还附上了 cmd 屏幕截图以供参考。 Error:flutter doctor
更新#1： 我也尝试执行此命令：
C:\Users\hashim irfan>flutter doctor --android-licenses
我得到的输出是
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 5 more
我在这里附上了那个错误：Error:flutter doctor --android-licenses
【问题讨论】：
标签： flutter