android { ... sourceSets { main.java.srcDirs += '../../MyExtraCode/src'; } }This will only pull in the .java files. If they have any dependencies they need to be added to your client app's gradle files.
Programming Tips - Android Studio: symbolic link to shared code folder
Date: 2020apr14
Language: gradle
Q. Android Studio: symbolic link to shared code folder
A. Add to your app gradle.build