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

My app were running absolutely fine before and I do not get what was the problem later on. There were no updates in any files. I got an error in D:\src-flutter\Flutter-Projects\testing_app\android\app\build.gradle file. I tried solving it using many links.

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Here is the command line implementation: \

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.

Typing flutter doctor --android-licenses does not work.

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

Hiding the obsolete packages does not give me an option of Android SDK tools.

Any help would be appreciated.

Answer 1

Caused by: java.lang.ClassNotFoundException

Verify the specified class name and check whether or not the .jar file exists in the classpath. If it already exists, then make sure that it is not overridden in your program. If the file does not exist, then simply add the .jar file in the classpath.