Observable

Kotlin |Java

abstract class Observable<T : Any!>

kotlin.Any
↳	android.database.Observable

Known Direct Subclasses

ContentObservable, DataSetObservable

ContentObservable	A specialization of `Observable` for `ContentObserver` that provides methods for sending notifications to a list of `ContentObserver` objects.
DataSetObservable	A specialization of `Observable` for `DataSetObserver` that provides methods for sending notifications to a list of `DataSetObserver` objects.

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

Public constructors
`Observable()`

Public methods
open Unit	`registerObserver(observer: T)` Adds an observer to the list.
open Unit	`unregisterAll()` Remove all registered observers.
open Unit	`unregisterObserver(observer: T)` Removes a previously registered observer.

Properties
ArrayList<T>!	`mObservers` The list of observers.

Public constructors

Observable

Observable()

Public methods

registerObserver

Added in API level 1

open fun registerObserver(observer: T): Unit

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

Exceptions
`java.lang.IllegalArgumentException`	the observer is null
`java.lang.IllegalStateException`	the observer is already registered

unregisterAll

Added in API level 1

open fun unregisterAll(): Unit

Remove all registered observers.

unregisterObserver

Added in API level 1

open fun unregisterObserver(observer: T): Unit

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

Exceptions
`java.lang.IllegalArgumentException`	the observer is null
`java.lang.IllegalStateException`	the observer is not yet registered

Properties

mObservers

Added in API level 1

protected val mObservers: ArrayList<T>!

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