Added in API level 1
Deprecated in API level 33

Observer

interface Observer
java.util.Observer

A class can implement the Observer interface when it wants to be informed of changes in observable objects.

Summary

Public methods
abstract Unit
update(o: Observable!, arg: Any!)

This method is called whenever the observed object is changed.

Public methods

update

Added in API level 1
abstract fun update(
    o: Observable!, 
    arg: Any!
): Unit

Deprecated: Deprecated in Java.

This method is called whenever the observed object is changed. An application calls an Observable object's notifyObservers method to have all the object's observers notified of the change.

Parameters
o Observable!: the observable object.
arg Any!: an argument passed to the notifyObservers method.