rn android 运行失败

https://stackoverflow.com/questions/37900737/make-sure-you-have-an-android-emulator-running-or-a-device-connected-and-have

You might check the permissions on Android/Gradlew They should be 755 not 644.

Run chmod 755 android/gradlew inside your app root folder.

Then run react-native run-android.