What is AAPT (Android Asset Packaging Tool) and how does it work?
AAPT allows you to view, create, and update ZIP-compatible archives (ZIP, JAR, and APK). It can also compile resources into binary assets. It is the base builder for Android applications.
Of course you can ship .so files from an application, but if you want to use it, you will need reverse engineering plugins and these are not very recommended because of the complexity. I don't know anyone for Android, but there are a bunch of environments plugins.
Also you can research a bit before posting,
AAPT usages
Reverse engineering for Android
It is the default tool of the Android SDK to pack all classes and resources in an APK file.