missing the “.project” file in
OF/addons/ofxAndroid/ofAndroidLib
from this link on the download page
http://www.openframeworks.cc/versions/preRelease-v0.07/of-preRelease-v007-android.tar.gz
The project file appears to be on github. The preRelease tar should really be updated for this. I had the same problem and it’s required to compile it seems.