react native 错误：Make sure you have an Android emulator running or a device connected and have set up

最近研究 react native ，在mac 上配置android 环境时，遇到一个问题：

在执行 react native run-android 时报错：

react native 错误：
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/android-setup.html

查了好多解决方案：最后找到一个有效的，记录下：

中文

我找到解决方法了
首先 确定 是用 brew install android-sdk
安装后 会在 /usr/local/Cellar/android-sdk 这个目录
同时 /usr/local/var/lib/android-sdk 这个目录也会存在一部分 源
前者 一部分 以 link 后者的
最后 要把 前者目录里的 platform-tools build-tools 拷贝到 /usr/local/var/lib/android-sdk
ANDROID_HOME=/usr/local/var/lib/android-sdk

react-native run-android

English

I found a solution
First determine with brew install android-sdk
In / usr / local / Cellar / android-sdk directory after installation
While / usr / local / var / lib / android-sdk directory will be present as part of the source
In the latter part of the former link
Finally,should the former platform-tools build-tools copied to / usr / local / var / lib / android-sdk
ANDROID_HOME = / usr / local / var / lib / android-sdk
it’s ok

解决方案参考地址
react native 配置教程