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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
可以先检查adb是否连接：
adb devices列表出现类似这样的表示连接成功：
List of devices attached
emulator-5554 device如果没解决再检查 sdk
命令行定位到当前RN项目目录：在运行前执行
ANDROID_HOME=/Users/apple/Library/Android/sdk手动设置 android sdk 目录.
设置完后再执行
react-native run-android