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DataSetObserver
abstract class DataSetObserver
Known Direct Subclasses
| AlphabetIndexer |
A helper class for adapters that implement the SectionIndexer interface.
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Receives call backs when a data set has been changed, or made invalid. The typically data sets that are observed are Cursors or android.widget.Adapters. DataSetObserver must be implemented by objects which are added to a DataSetObservable.
Summary
| Public methods |
| open Unit |
This method is called when the entire data set has changed, most likely through a call to Cursor.requery() on a Cursor.
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| open Unit |
This method is called when the entire data becomes invalid, most likely through a call to Cursor.deactivate() or android.
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Public constructors
DataSetObserver
DataSetObserver()
Public methods
onChanged
open fun onChanged(): Unit
This method is called when the entire data set has changed, most likely through a call to Cursor.requery() on a Cursor.
onInvalidated
open fun onInvalidated(): Unit
This method is called when the entire data becomes invalid, most likely through a call to Cursor.deactivate() or android.database.Cursor#close() on a Cursor.
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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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10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,["# DataSetObserver\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)\n\nDataSetObserver\n===============\n\n*** ** * ** ***\n\nKotlin \\|[Java](/reference/android/database/DataSetObserver \"View this page in Java\") \n\n```\nabstract class DataSetObserver\n```\n\n|---|---------------------------------------|\n| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||\n| ↳ | [android.database.DataSetObserver](#) |\n\n|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| Known Direct Subclasses [AlphabetIndexer](../widget/AlphabetIndexer.html#) |----------------------------------------------------|--------------------------------------------------------------------------| | [AlphabetIndexer](../widget/AlphabetIndexer.html#) | A helper class for adapters that implement the SectionIndexer interface. | |\n\nReceives call backs when a data set has been changed, or made invalid. The typically data sets that are observed are [Cursor](/reference/kotlin/android/database/Cursor)s or [android.widget.Adapter](../widget/Adapter.html#)s. DataSetObserver must be implemented by objects which are added to a DataSetObservable.\n\nSummary\n-------\n\n| Public constructors ||\n|--------------------------------------------------|---|\n| [DataSetObserver](#DataSetObserver())`()` \u003cbr /\u003e |\n\n| Public methods ||\n|-----------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| open [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onChanged](#onChanged())`()` This method is called when the entire data set has changed, most likely through a call to [Cursor.requery()](/reference/kotlin/android/database/Cursor#requery()) on a [Cursor](/reference/kotlin/android/database/Cursor). |\n| open [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onInvalidated](#onInvalidated())`()` This method is called when the entire data becomes invalid, most likely through a call to [Cursor.deactivate()](/reference/kotlin/android/database/Cursor#deactivate()) or android. |\n\nPublic constructors\n-------------------\n\n### DataSetObserver\n\n```\nDataSetObserver()\n```\n\nPublic methods\n--------------\n\n### onChanged\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun onChanged(): Unit\n```\n\nThis method is called when the entire data set has changed, most likely through a call to [Cursor.requery()](/reference/kotlin/android/database/Cursor#requery()) on a [Cursor](/reference/kotlin/android/database/Cursor). \n\n### onInvalidated\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun onInvalidated(): Unit\n```\n\nThis method is called when the entire data becomes invalid, most likely through a call to [Cursor.deactivate()](/reference/kotlin/android/database/Cursor#deactivate()) or android.database.Cursor#close() on a [Cursor](/reference/kotlin/android/database/Cursor)."]]
