File	Doc	Category	Size	Date	Package
Observable.java	API Doc	Android 1.5 API	2676	Wed May 06 22:41:54 BST 2009	android.database

Observable

• java.lang.Object

Fields Summary
protected final ArrayList	mObservers The list of observers. An observer can be in the list at most once and will never be null.

Constructors Summary

Methods Summary
public void	registerObserver(T observer) Adds an observer to the list. The observer cannot be null and it must not already be registered. param observer the observer to register throws IllegalArgumentException the observer is null throws IllegalStateException the observer is already registered if (observer == null) { throw new IllegalArgumentException("The observer is null."); } synchronized(mObservers) { if (mObservers.contains(observer)) { throw new IllegalStateException("Observer " + observer + " is already registered."); } mObservers.add(observer); }
public void	unregisterAll() Remove all registered observer synchronized(mObservers) { mObservers.clear(); }
public void	unregisterObserver(T observer) Removes a previously registered observer. The observer must not be null and it must already have been registered. param observer the observer to unregister throws IllegalArgumentException the observer is null throws IllegalStateException the observer is not yet registered if (observer == null) { throw new IllegalArgumentException("The observer is null."); } synchronized(mObservers) { int index = mObservers.indexOf(observer); if (index == -1) { throw new IllegalStateException("Observer " + observer + " was not registered."); } mObservers.remove(index); }