I had the same issue, I resolved it a bit differently. After
importing the project, go to Project Properties > Android >
and Scroll Down to "Library" the package "com.facebook.android"
should be listed there, select it and click on "Apply" and "OK".
This will build the R.java for the facebook api, as the API
generates a dialog the R.java is required.
If you dont see the package as said above, then the project was
added as an External Jar. This will list it under "Referenced
Libraries" in your Explorer.
Doar importați-o ca proiect și urmați așa cum am menționat mai