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

Go to File → Settings → Editor → Auto Import and at java tab you should have:

Insert imports on paste: ASK.
If you have import for ALL, then Android Studio import other file.