Android ProGuard Learning

• if all public methods may be callback methods

-keep class mypackage.MyCallbackClass {
    public <methods>;
}

• For native methods: ProGuard manual > Examples > Processing native methods

-keepclasseswithmembernames class * {
    native <methods>;
}

• In this case, for callback methods: ProGuard manual > Examples > Processing callback methodss

-keep class mypackage.MyCallbackClass {
    void myCallbackMethod(java.lang.String);
}

https://stackoverflow.com/questions/7880107/in-proguard-how-to-preserve-a-set-of-classes-method-names
https://www.guardsquare.com/en/products/proguard/manual/