I work on a small android project that uses the unity-clases.jar generated by Unity. Some (not all) of the files/classes in the .jar can't be resolved when compiling the android project and I don't understand why.
I've unzipped the .jar files, it contains these files :
I ran the javap utility on some of these files, they are generated with java 17, and they all have a strange warning "Warning: File ./Xxxx.class does not contain class Xxxx" that I don't understand because each Xxxx.class file actually contains the definition of the class Xxxx, as shown by the same utility javap output. See example below with class "IUnityPlayerLifecycleEvents".
When I try to compile my android project, I get this kind of Unresolved reference errors :
When I open the project on Android Studio (Narwhal), I can see that some of the classes defined in the unity-classes.jar are recognized, and some are not. Here is an example screenshot of a kotlin file in Android Studio.
When I try to autocomplete com.unity3d.player on Android Studio, I can see the list of classes in unity-classes.jar that are recognized, see screenshot below.
Something else I don't understand, when displaying one of the recognised unity-classes.jar classes in Android Studio (via right click and "go to definition"), it says it's java 8 bytecode. But when unzipping my self the unity-classes.jar files and opening the same file/class in Android Studio, it says it is java 17 bytecode (consistent with javap utility output previously seen). See screenshots below.
