If...Else

react native 환경설정 가이드대로 모두 세팅했지만, 안드로이드 디바이스에 빌드 시 에러가 발생했다. $ react-native run-android info JS server already running. info Building and installing the app on the device (cd android && ./gradlew app:installDebug)... error 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 de..