Question

Rather than just mindlessly copy and pasting, I decide to understand what I’ve copy and pasted, and I got stuck with R.id.class.getFields()! My initial guess was it would be a static Class variable, but does the id class have such?

R = the R class of R.java

id = the inner id class of R.java

class = ??

getFields() = Class.getFields()

Answer 1

R.java is a class. Auto generated class from the Resources. R.id is accessing to a inner class. The public static final class id. R.id.class will give you a Class object of R.id and getFields method will return all the public fields inside the class R.id . Take a look to the reflection mechanism.

EDIT: reflection.