Android 许可证状态未知。尝试重新安装或更新您的 Android SDK 管理器答案

【问题标题】：Android license status unknown. Try re-installing or updating your Android SDK ManagerAndroid 许可证状态未知。尝试重新安装或更新您的 Android SDK 管理器
【发布时间】：2020-10-29 12:18:42
【问题描述】：

我的应用程序之前运行得非常好，但后来我不明白问题出在哪里。任何文件中都没有更新。我在 D:\src-flutter\Flutter-Projects\testing_app\android\app\build.gradle 文件中遇到错误。我尝试使用许多链接来解决它。

下面是命令行实现：\

D:\src-flutter\flutter>flutter --version
Flutter 1.17.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 8af6b2f038 (8 days ago) • 2020-06-30 12:53:55 -0700
Engine • revision ee76268252
Tools • Dart 2.8.4

D:\src-flutter\flutter>java -version
java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

D:\src-flutter\flutter>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.17.5, on Microsoft Windows [Version 10.0.18363.900], locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit visit
      https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions.
[√] Android Studio (version 4.0)
[√] Connected device (1 available)

! Doctor found issues in 1 category.

输入 flutter doctor --android-licenses 不起作用。

D:\src-flutter\flutter>flutter doctor --android-licenses
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
        at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
        at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
        at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
        at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
        at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        ... 5 more

隐藏过时的包不会让我选择 Android SDK 工具。

任何帮助将不胜感激。

【问题讨论】：

标签： java android flutter android-sdk-manager

【解决方案1】：

引起：java.lang.ClassNotFoundException

验证指定的类名，检查类路径中是否存在.jar文件。如果它已经存在，请确保它没有在您的程序中被覆盖。如果该文件不存在，则只需在类路径中添加.jar 文件即可。

【讨论】：