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错误示例：
env: bash\r: No such file or directory
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如果是本地创建的项目遇到类似错误，请参考：
ReactNative运行Could not install the app on the device, read the error above for details错误
如果是从通过git clone下来的项目
请先检查android 目录下是否存在 local.properties 文件，因为在执行 git init 初始化本地仓库的时候，默认会生成 .gitignore 忽略文件，查看里面的忽略配置发现该文件是被忽略的，所在在执行 react-native run-android 的时候，无法加载SDK。