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DataSetObservable
open class DataSetObservable : Observable<DataSetObserver!>
A specialization of Observable for DataSetObserver that provides methods for sending notifications to a list of DataSetObserver objects.
Summary
| Inherited functions |
From class Observable
Unit |
registerObserver(observer: T)
Adds an observer to the list. The observer cannot be null and it must not already be registered.
|
Unit |
unregisterAll()
Remove all registered observers.
|
Unit |
unregisterObserver(observer: T)
Removes a previously registered observer. The observer must not be null and it must already have been registered.
|
|
Public constructors
DataSetObservable
DataSetObservable()
Public methods
notifyChanged
open fun notifyChanged(): Unit
Invokes DataSetObserver.onChanged on each observer. Called when the contents of the data set have changed. The recipient will obtain the new contents the next time it queries the data set.
notifyInvalidated
open fun notifyInvalidated(): Unit
Invokes DataSetObserver.onInvalidated on each observer. Called when the data set is no longer valid and cannot be queried again, such as when the data set has been closed.
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# DataSetObservable\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)\n\nDataSetObservable\n=================\n\n*** ** * ** ***\n\nKotlin \\|[Java](/reference/android/database/DataSetObservable \"View this page in Java\") \n\n```\nopen class DataSetObservable : Observable\u003cDataSetObserver!\u003e\n```\n\n|---|---|-----------------------------------------|\n| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) |||\n| ↳ | [android.database.Observable](/reference/kotlin/android/database/Observable)\\\u003c[android.database.DataSetObserver](/reference/kotlin/android/database/DataSetObserver)\\\u003e ||\n| | ↳ | [android.database.DataSetObservable](#) |\n\nA specialization of [Observable](/reference/kotlin/android/database/Observable) for [DataSetObserver](/reference/kotlin/android/database/DataSetObserver) that provides methods for sending notifications to a list of [DataSetObserver](/reference/kotlin/android/database/DataSetObserver) objects.\n\nSummary\n-------\n\n| Public constructors ||\n|------------------------------------------------------|---|\n| [DataSetObservable](#DataSetObservable())`()` \u003cbr /\u003e |\n\n| Public methods ||\n|-----------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| open [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [notifyChanged](#notifyChanged())`()` Invokes [DataSetObserver.onChanged](/reference/kotlin/android/database/DataSetObserver#onChanged()) on each observer. |\n| open [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [notifyInvalidated](#notifyInvalidated())`()` Invokes [DataSetObserver.onInvalidated](/reference/kotlin/android/database/DataSetObserver#onInvalidated()) on each observer. |\n\n| Inherited functions ||\n|---|---|\n| From class [Observable](/reference/kotlin/android/database/Observable) |------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [registerObserver](/reference/kotlin/android/database/Observable#registerObserver(android.database.Observable.T))`(`observer:` `T`)` Adds an observer to the list. The observer cannot be null and it must not already be registered. \u003cbr /\u003e | | [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [unregisterAll](/reference/kotlin/android/database/Observable#unregisterAll())`()` Remove all registered observers. \u003cbr /\u003e | | [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [unregisterObserver](/reference/kotlin/android/database/Observable#unregisterObserver(android.database.Observable.T))`(`observer:` `T`)` Removes a previously registered observer. The observer must not be null and it must already have been registered. \u003cbr /\u003e | ||\n\n| Inherited properties ||\n|---|---|\n| From class [Observable](/reference/kotlin/android/database/Observable) |--------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ArrayList](../../java/util/ArrayList.html#)\u003cT\u003e! | [mObservers](/reference/kotlin/android/database/Observable#mObservers:java.util.ArrayList) The list of observers. An observer can be in the list at most once and will never be null. \u003cbr /\u003e | ||\n\nPublic constructors\n-------------------\n\n### DataSetObservable\n\n```\nDataSetObservable()\n```\n\nPublic methods\n--------------\n\n### notifyChanged\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun notifyChanged(): Unit\n```\n\nInvokes [DataSetObserver.onChanged](/reference/kotlin/android/database/DataSetObserver#onChanged()) on each observer. Called when the contents of the data set have changed. The recipient will obtain the new contents the next time it queries the data set. \n\n### notifyInvalidated\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun notifyInvalidated(): Unit\n```\n\nInvokes [DataSetObserver.onInvalidated](/reference/kotlin/android/database/DataSetObserver#onInvalidated()) on each observer. Called when the data set is no longer valid and cannot be queried again, such as when the data set has been closed."]]
