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Extender
interface Extender
Extender interface for use with Builder.extend. Extenders may be used to add metadata or change options on a notification builder.
Summary
Public methods
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Last updated 2025-08-20 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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-20 UTC."],[],[],null,["# Notification.Extender\n\nAdded in [API level 20](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)\n\nExtender\n========\n\n*** ** * ** ***\n\nKotlin \\|[Java](/reference/android/app/Notification.Extender \"View this page in Java\") \n\n```\ninterface Extender\n```\n\n|----------------------------------------|\n| [android.app.Notification.Extender](#) |\n\n|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| Known Direct Subclasses [Notification.CarExtender](/reference/kotlin/android/app/Notification.CarExtender), [Notification.TvExtender](/reference/kotlin/android/app/Notification.TvExtender), [Notification.WearableExtender](/reference/kotlin/android/app/Notification.WearableExtender) |----------------------------------------------------------------------------------------------|---------------------------------------------------------------| | [Notification.CarExtender](/reference/kotlin/android/app/Notification.CarExtender) | Helper class to add Android Auto extensions to notifications. | | [Notification.TvExtender](/reference/kotlin/android/app/Notification.TvExtender) | Helper class to add Android TV extensions to notifications. | | [Notification.WearableExtender](/reference/kotlin/android/app/Notification.WearableExtender) | Helper class to add wearable extensions to notifications. | |\n\nExtender interface for use with [Builder.extend](/reference/kotlin/android/app/Notification.Builder#extend(android.app.Notification.Extender)). Extenders may be used to add metadata or change options on a notification builder.\n\nSummary\n-------\n\n| Public methods ||\n|--------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| abstract [Notification.Builder](/reference/kotlin/android/app/Notification.Builder)! | [extend](#extend(android.app.Notification.Builder))`(`builder:` `[Notification.Builder](/reference/kotlin/android/app/Notification.Builder)!`)` Apply this extender to a notification builder. |\n\nPublic methods\n--------------\n\n### extend\n\nAdded in [API level 20](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nabstract fun extend(builder: Notification.Builder!): Notification.Builder!\n```\n\nApply this extender to a notification builder.\n\n| Parameters ||\n|-----------|---------------------------------------------------------------------------------------------------------|\n| `builder` | [Notification.Builder](/reference/kotlin/android/app/Notification.Builder)!: the builder to be modified |\n\n| Return ||\n|-----------------------------------------------------------------------------|-------------------------------|\n| [Notification.Builder](/reference/kotlin/android/app/Notification.Builder)! | the build object for chaining |"]]
