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

Question

我的应用之前运行得非常好，后来我再也没发现问题所在。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。

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这是命令行实现：\

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.

键入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

隐藏过时的软件包不会给我提供Android SDK工具的选项。

任何帮助将不胜感激。

Answer 1

原因：java.lang.ClassNotFoundException

验证指定的类名，并检查类路径中是否存在.jar文件。如果已经存在，请确保它在程序中没有被覆盖。如果该文件不存在，则只需在类路径中添加.jar文件即可。