Oh, I see. I... think I use of as a shared library as well, like I mentioned above it's just my own code that is built on start. I guess you are using something custom then? I went through the install instructions here to get everything going and I ended up with a command that invokes a makefile:
http://openframeworks.cc/setup/android-eclipse/
I'm not sure how long it takes on Android Studio, I'm just blindly assuming that you would be able to disable the build-on-startup behavior!