Exporting Google Android project from Unity 4 to Android Studio issue

Greetings.

My project uses Unity4.7 for a multitude of reasons, and I need to export it as an Android Studio project so I can add a custom Facebook SDK code. (Since the FB SDK plugin isn't compatible with Unity4)

But the problem is that when I export the project as a Google Android project from Unity in the build settings, and import it from Android Studio (ver. 2.2) the project doesn't build a proper APK file of the project, instead making what seems to be an empty one of about 2 MB in size, whereas if I were to build the APK directly from the Unity Editor I'd get a filesize of about 60MB.

I'm unsure what I'm doing wrong or what's going wrong in this case, any insight would be apprecciated. Thanks in advance.