Conditional include for files inside ANDROID_PACKAGE_SOURCE_DIR?

[Wiru]

Is there a way to conditionally include files from the ANDROID_PACKAGE_SOURCE_DIR?
Currently I have all the jni, jar, so files inside /android folder which is then provided to ANDROID_PACKAGE_SOURCE_DIR, this results in all the files always being included in the project, which sometimes shouldn't be the case.

I'm not fully sure how the ANDROID_PACKAGE_SOURCE_DIR works and how it affects the final .apk, which files are mandatory and which ones I can move out.

For iOS I put the includes in separate blocks and add them with CONFIG += when needed, and I'd like to do the same for android.

If anyone had a similar case how did you solve it?