How to get the orientation from Android?

Now I understand better, thank you very much.
So, basically I'd like to do something like this:

1. add to my ofApp.cpp a snippet of code that calls for a variable in java, e.g. the currentDegree one;
2. insert the main Java code as explained here;

3. compile with:

   ./gradlew assembleDebug

I'm assuming I have already the gradle library inside the project directory.
Is that correct in your opinion?