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Added in API level 1

Summary: Fields | Ctors | Methods | Inherited Methods | [Expand All]

Observable

public abstract class Observable
extends Object

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

Known Direct Subclasses

ContentObservable, DataSetObservable

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.

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.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Fields

mObservers

Added in API level 1

ArrayList<T> mObservers

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

Public constructors

Observable

Added in API level 1

Observable ()

Public methods

registerObserver

Added in API level 1

void registerObserver (T observer)

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

Parameters
`observer`	`T`: the observer to register

Throws
`IllegalArgumentException`	the observer is null
`IllegalStateException`	the observer is already registered

unregisterAll

Added in API level 1

void unregisterAll ()

Remove all registered observers.

unregisterObserver

Added in API level 1

void unregisterObserver (T observer)

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

Parameters
`observer`	`T`: the observer to unregister

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