Android Studio cannot resolve R in imported project?

Question

I\'m trying the new Android Studio. I\'ve exported a project from eclipse, using the build gradle option. I\'ve then imported it in Android Studio. The R.java file under gen

Answer 1

This issue starting occurring for me when I started working with build.gradle to incorporate the data necessary (signingConfigs) to build a signed .apk. After what appeared to be a successful build from the command line, I discovered that going into any class using R.* that all R.* references were unresolved.

The answers here didn't help me. I decided to re-import the project and it magically fixed the issue. File/Import Project... and select the build.gradle file in my apps root folder. I would love to know why re-import fixed this :)