【Flutter】运行安卓报错：flutter doctor -

1、flutter doctor --android-licenses报错

odd@Mac-mini flutterdemo % flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 2.1.0-11.0.pre.145, on macOS 12.0.1 21A559 darwin-x64, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    ✗ 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
[✓] Chrome - develop for the web
[!] Android Studio (version 2020.3)
    ✗ Unable to find bundled Java version.
[✓] IntelliJ IDEA Ultimate Edition (version 2020.1)
[✓] VS Code (version 1.62.3)
[✓] Connected device (3 available)

! Doctor found issues in 2 categories.
odd@Mac-mini flutterdemo % 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:522)
        ... 5 more

解决方式：Install Android SDK Command-line tools
MAC上： Android Studio->Preference

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2、Unable to find bundled Java version.

路径不对，需要调整
在安装的flutter路径里：flutter/packages/flutter_tools/lib/src/android/android_studio.dart

android_studio.dart代码里加载设置如下：

final String javaPath = globals.platform.isMacOS ?
        globals.fs.path.join(directory, 'jre', 'jdk', 'Contents', 'Home') :
        globals.fs.path.join(directory, 'jre');

Android Studio的路径里，没有jdk文件，如下：

1、在Find里的应用程序里，选中Android Studio, 然后右键显示包内容；
2、Contents->jre->Contents,
3、发现jre文件夹里没有jdk这个文件夹，
4、在jre文件夹里新建jdk文件，并把jre中的Contents文件夹整个复制添加到jdk里，
5、添加后jre下有两个文件Contents，jdk, 路径：
Contents->jre->Contents,
Contents->jre->jdk->Contents,

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