I am developing a word game. My aim is to have 90% of the code in pure Java, which is then referenced by Android Studio for an android app, by GWT to make a web solution and exported into objective C for iOS for the small amount of UI coding needed.
I have written all the code and I am only able to do this by manually copying the java classes between the projects. Clearly it must be possible as this seems such an obvious use case, but there does not seem to be a straightforward solution.
I realise I may be missing something. I have searched extensively, in particular the following:
Import source java project in Android project
Android studio add external project to build.gradle
Any help would be much appreciated.