Flutter开发-flutter安装其他依赖遇到的问题（Windows）

运行 flutter doctor 

Flutter 提供了一个 flutter doctor 命令协助我们安装 Flutter 的依赖。它会检查本地是否有 iOS 和 Android 的开发环境。如果检测到依赖缺失，它还会给出对应依赖的安装方法

运行以下命令查看是否需要安装其它依赖项来完成安装：

flutter doctor --verbose

简写

flutter doctor --v

该命令检查您的环境并在终端窗口中显示报告

C:\Users\tong>flutter doctor -v

[√] Flutter (Channel beta, v0.5.1, on Microsoft Windows [Version 10.0.16299.125], locale zh-CN)

    • Flutter version 0.5.1 at D:\Program\flutter

    • Framework revision c7ea3ca377 (7 weeks ago), 2018-05-29 21:07:33 +0200

    • Engine revision 1ed25ca7b7

    • Dart version 2.0.0-dev.58.0.flutter-f981f09760

 

[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)

    • Android SDK at D:\Program\Android\Sdk

    • Android NDK location not configured (optional; useful for native profiling support)

    • Platform android-27, build-tools 27.0.3

    • ANDROID_HOME = D:\Program\Android\Sdk

    • Java binary at: D:\Program\Android\Android Studio\jre\bin\java

    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

 

[√] Android Studio (version 3.1)

    • Android Studio at D:\Program\Android\Android Studio

    • Flutter plugin version 26.0.1

    • Dart plugin version 173.4700

    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

 

[√] Connected devices (1 available)

    • MI 4LTE • 6127b114 • android-arm • Android 6.0.1 (API 23)

 

! Doctor found issues in 1 category.

 

上面有三个地方打叉 一个感叹号,iOS 那部分按照提示做就ok,最下面感叹号电脑连接上 android 手机就好 ,下面记录一下 android 那部分 

✗ Android license status unknown. 

下面就是记录解决问题所执行的命令

C:\Users\tong>flutter doctor --android-licenses

A newer version of the Android SDK is required. To update, run:

D:\Program\Android\Sdk\tools\bin\sdkmanager --update

 

C:\Users\tong>D:\Program\Android\Sdk\tools\bin\sdkmanager --update

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema

at com.android.repository.api.SchemaModule$SchemaModuleVersion.(SchemaModule.java:156)

at com.android.repository.api.SchemaModule.(SchemaModule.java:75)

at com.android.sdklib.repository.AndroidSdkHandler.(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:582)

at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)

at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)

... 5 more

最终找到原因是使用Java9的原因

解决方案：

    使用文本编辑器打开sdkmanager.bat文件，找到DEFAULT_JVM_OPTS属性，在其最后添加‘--add-modules java.xml.bind’

(参考https://stackoverflow.com/questions/47345147/android-sdk-manager-throw-exception-with-java-9)

 

重新打开命令号执行flutter doctor -v，此时依旧会提示之前的错误， 接着执行flutter doctor --android-licenses

C:\Users\tong>flutter doctor --android-licenses

                                                                                Warning: File C:\Users\tong\.android\repositories.cfg could not be loaded.

5 of 6 SDK package licenses not accepted. 100% Computing updates...

Review licenses that have not been accepted (y/N)? y

多输几次 y, 最后就是

---------------------------------------

Accept? (y/N): y

All SDK package licenses accepted

 

C:\Users\tong>flutter doctor --verbose

[√] Flutter (Channel beta, v0.5.1, on Microsoft Windows [Version 10.0.16299.125], locale zh-CN)

    • Flutter version 0.5.1 at D:\Program\flutter

    • Framework revision c7ea3ca377 (7 weeks ago), 2018-05-29 21:07:33 +0200

    • Engine revision 1ed25ca7b7

    • Dart version 2.0.0-dev.58.0.flutter-f981f09760

 

[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)

    • Android SDK at D:\Program\Android\Sdk

    • Android NDK location not configured (optional; useful for native profiling support)

    • Platform android-27, build-tools 27.0.3

    • ANDROID_HOME = D:\Program\Android\Sdk

    • Java binary at: D:\Program\Android\Android Studio\jre\bin\java

    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

    • All Android licenses accepted.

 

[√] Android Studio (version 3.1)

    • Android Studio at D:\Program\Android\Android Studio

    • Flutter plugin version 26.0.1

    • Dart plugin version 173.4700

    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

 

[√] Connected devices (1 available)

    • MI 4LTE • 6127b114 • android-arm • Android 6.0.1 (API 23)

 

• No issues found!