Stop entering ad-hoc magic constants or 1,2,3,... sequences in your intent request codes, or build scripts to generate random translation keys.
Some people argue that if you do not intend to produce javadoc for your project, you should not clutter your comments with unnecessary <pre>, <blockquote>s and the likes
So you find yourself calling values() lots in your code.
Enums have a name() method. And it has a very precise meaning.
is it: Days day = MONDAY; or is it: Days days = MONDAY;