Demo7不能运行。

[kingctan]

报错： ··· $ react-native run-android Starting JS server... Building and installing the app on the device (cd android && ./gradlew installDebug... 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 ··· 本机环境运行其它RN项目没问题的。谢谢！