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ProGuard uses the naming convention of Java bytecode, as seen in class file names and stacktraces. Therefore:

-keep public interface com.somepackage.SomeClass$someInterface {*;}
                I lost an hour because I used above syntax which didn't work for me. The reason was that I define my interfaces without the public accessor (it's obsolete since all interfaces are public). In that case you need to use: -keep interface com.somepackage.SomeClass$someInterface {*;}. I think ProGuard should be "clever" enough to handle his case automatically.
– Emanuel Moecklin
                Jan 30, 2017 at 21:18
For those who are looking for how to keep a custom annotation (which is defined in a @interface in java) retaining its all members,
you should actually use like below to keep it:
-keep @interface com.your.annotation.interface. {*;}
                isnt that you should have it like -keep @interface com.your.annotation.interface.** { *; } or it is the different meaning?
– Emil
                Jul 10, 2022 at 23:15
        
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