react-native开发中错误SDK location not found

react-native开发中错误SDK location not found

遇到的问题：

Scanning folders for symlinks in D:\souece_space\rn\FirstPro\node_modules (175ms)
JS server already running.
Building and installing the app on the device (cd android && gradlew.bat install Debug)…

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 file or with an ANDROID_HOME environment variable.

Try:Run with –stacktrace option to get the stack trace. Run with –info or –debugoption to get more log output.

BUILD FAILED

Total time: 9.439 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

解决方法：

报这个错，是因为创建的React-Native工程少文件,找到你任意能运行的android 项目，把local.properties文件拷贝到\YourProject\android目录下，OK,问题解决。