Observable

Class Overview

Provides methods for registering or unregistering arbitrary observers in an


        
         ArrayList

. This abstract class is intended to be subclassed and specialized to maintain a registry of observers of specific types and dispatch notifications to them.

Summary

Fields
protected final ArrayList <T>	mObservers	The list of observers.

Fields

protected final ArrayList <T>

mObservers

The list of observers.

Public Constructors
	Observable ()

Public Constructors

Observable ()

Public Methods
void	registerObserver (T observer) Adds an observer to the list.
void	unregisterAll () Remove all registered observers.
void	unregisterObserver (T observer) Removes a previously registered observer.

Public Methods

void

registerObserver (T observer)

Adds an observer to the list.

void

unregisterAll ()

Remove all registered observers.

void

unregisterObserver (T observer)

Removes a previously registered observer.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone () Creates and returns a copy of this `Object` .
boolean	equals ( Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize () Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class <?>	getClass () Returns the unique instance of `Class` that represents this object's class.
int	hashCode () Returns an integer hash code for this object.
final void	notify () Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll () Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString () Returns a string containing a concise, human-readable description of this object.
final void	wait () Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait (long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait (long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Fields

protected final ArrayList <T> mObservers

Added in API level 1

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

Public Methods

public void registerObserver (T observer)

Added in API level 1

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 unregisterAll ()

Added in API level 1

Remove all registered observers.

public void unregisterObserver (T observer)

Added in API level 1

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

Results

Interfaces

Classes

Enums

Exceptions

Class Overview

Summary

Fields

protected final ArrayList <T> mObservers

Public Constructors

public Observable ()

Public Methods

public void registerObserver (T observer)

Parameters

Throws

public void unregisterAll ()

public void unregisterObserver (T observer)

Parameters

Throws

java.lang.Object
↳	android.database.Observable<T>