React Native 运行报错 ---- SDK location not found

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React Native 环境搭建完成，创建项目后，

运行报错：

    FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring project ':app'.
> SDK location not found. Define location with sdk.dir in the local.properties f
ile or with an ANDROID_HOME environment variable.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug
option to get more log output.
BUILD FAILED
Total time: 13.533 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:

https://facebook.github.io/react-native/docs/getting-started.html

两种解决方法：

（一） 添加系统环境变量   ANDROID_HOME 指向  Android SDK 的安装目录

  以win7设置环境变量为例

  

（二）在react-native 项目 android文件夹下新建 local.properties 文件 内容如下 （或者从已有的android项目中直接copy过来）

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    sdk.dir=D\:\\Android\\sdk