Should I strictly avoid using enums on Android?

Question

I used to define a set of related constants like Bundle keys together in an interface like below:

public interface From{
    String LOGIN_SCREEN         


        

Answer 1

I like to add, that you can not use @Annotations when you declare a List<> or Map<> where either key or value is of one of your annotation interfaces. You get the error "Annotations are not allowed here".

enum Values { One, Two, Three }
Map myMap;    // This works

// ... but ...
public static final int ONE = 1;
public static final int TWO = 2;
public static final int THREE = 3;

@Retention(RetentionPolicy.SOURCE)
@IntDef({ONE, TWO, THREE})
public @interface Values {}

Map myMap;    // *** ERROR ***

So when you need to pack it into a list/map, use enum, as they can be added, but @annotated int/string groups can not.