Flutter中文网-入门: 在macOS上搭建Flutter开发环境
安装过程中遇到的错误：
- flutter doctor遇到Android SDK is missing command line tools;
[-] Android toolchain - develop for Android devices
• Android SDK at /Users/obiwan/Library/Android/sdk
✗ Android SDK is missing command line tools; download from https://goo.gl/XxQghQ
• Try re-installing or updating your Android SDK,
visit https://flutter.io/setup/#android-setup for detailed instructions.
这个一般是因为Android Studio版本太低或者没有ANDROID_HOME环境变量等。先将Android Studio更新到最新版本，如果还有问题查看下ANDROID_HOME环境变量配置。
export PATH=/Users/用户名/Documents/flutter/flutter/bin:$PATH
export ANDROID_HOME="/Users/用户名/Documents/android_sdk" //android sdk目录，替换为你自己的即可
export PATH=${PATH}:${ANDROID_HOME}/tools
export PATH=${PATH}:${ANDROID_HOME}/platform-tools
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
- 执行/Users/****/Documents/android/sdk/tools/bin/sdkmanager --update 错误
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$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:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 5 more
查询相关资料是因为jdk版本太高，最后重新装了一下1.8的jdk才解决问题。
重新安装jdk:
- 打开Java所在目录；
open /Library/Java/JavaVirtualMachines/
- 删除已安装版本的jdk；
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-13.0.1.jdk
- 下载安装JDK1.8；
- 查找并设置JAVA_HOME，参考：在Mac中如何正确地设置JAVA_HOME；
- 重启终点，重新运行/Users/****/Documents/android/sdk/tools/bin/sdkmanager --update
