Android Studio don't generate R.java for my import project

Question

I import a project to Android Studio , but the R.java is always empty.

public final class R {
}

I have tried:

1. Make project,ma

Answer 1

I had a similar problem within my project using Android Studio 1.5.1. For me, bulding the project from command line by using following command resolved the problem:

gradle assembleRelease