Android - An Open Handset Alliance Project

android.database
public abstract class

android.database.Observable

java.lang.Object
	android.database.Observable

Provides methods for (un)registering arbitrary observers in an ArrayList.

Known Direct Subclasses

ContentObservable, DataSetObservable

Summary

Fields

protected final ArrayList mObservers The list of observers.

Public Constructors

Observable()

Public Methods

				void	registerObserver(T observer)
					Adds an observer to the list.
				void	unregisterObserver(T observer)
					Removes a previously registered observer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

	Object	clone()
		Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
	boolean	equals(Object o)
		Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
	void	finalize()
		Called by the virtual machine when there are no longer any (non-weak) references to the receiver.
final	Class	getClass()
		Answers the unique instance of java.lang.Class which represents the class of the receiver.
	int	hashCode()
		Answers an integer hash code for the receiver.
final	void	notify()
		Causes one thread which is `wait` ing on the receiver to be made ready to run.
final	void	notifyAll()
		Causes all threads which are `wait` ing on the receiver to be made ready to run.
	String	toString()
		Answers a string containing a concise, human-readable description of the receiver.
final	void	wait(long time, int frac)
		Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final	void	wait(long time)
		Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final	void	wait()
		Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by `notify` or `notifyAll`).

Details

Fields

protected final ArrayList mObservers

The list of observers. An observer can be in the list at most once and will never be null.

Public Constructors

public Observable()

Public Methods

public void registerObserver(T observer)

Adds an observer to the list. The observer cannot be null and it must not already be registered.

Parameters

observer	the observer to register

Throws

IllegalArgumentException	the observer is null
IllegalStateException	the observer is already registered

public void unregisterObserver(T observer)

Removes a previously registered observer. The observer must not be null and it must already have been registered.

Parameters

observer	the observer to unregister

Throws

IllegalArgumentException	the observer is null
IllegalStateException	the observer is not yet registered

Android - An Open Handset Alliance Project

Documentation

Goodies

android.database.Observable

Known Direct Subclasses

Summary

Fields

Public Constructors

Public Methods

Methods inherited from class java.lang.Object

Details

Fields

protected final ArrayList mObservers

Public Constructors

public Observable()

Public Methods

public void registerObserver(T observer)

Parameters

Throws

public void unregisterObserver(T observer)

Parameters

Throws

ContentObservable	A specialization of Observable for ContentObserver that provides methods for invoking the various callback methods of ContentObserver.
DataSetObservable	A specialization of Observable for DataSetObserver that provides methods for invoking the various callback methods of DataSetObserver.


e.g. "intent" or "activity"