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ObserverCallback
interface ObserverCallback
An interface which apps can implement to subscribe to notifications of changes to AppSearch data.
Summary
| Public methods |
| abstract Unit |
Callback to trigger after document changes (documents added, updated or removed).
|
| abstract Unit |
Callback to trigger after schema changes (schema type added, updated or removed).
|
Public methods
onDocumentChanged
abstract fun onDocumentChanged(changeInfo: DocumentChangeInfo): Unit
Callback to trigger after document changes (documents added, updated or removed).
| Parameters |
changeInfo |
DocumentChangeInfo: Information about the nature of the change. This value cannot be null. |
onSchemaChanged
abstract fun onSchemaChanged(changeInfo: SchemaChangeInfo): Unit
Callback to trigger after schema changes (schema type added, updated or removed).
| Parameters |
changeInfo |
SchemaChangeInfo: Information about the nature of the change. This value cannot be null. |
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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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10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,["# ObserverCallback\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \nAlso in [T Extensions 3](https://developer.android.com/sdkExtensions)\n\nObserverCallback\n================\n\n*** ** * ** ***\n\nKotlin \\|[Java](/reference/android/app/appsearch/observer/ObserverCallback \"View this page in Java\") \n\n```\ninterface ObserverCallback\n```\n\n|------------------------------------------------------|\n| [android.app.appsearch.observer.ObserverCallback](#) |\n\nAn interface which apps can implement to subscribe to notifications of changes to AppSearch data.\n\nSummary\n-------\n\n| Public methods ||\n|---------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| abstract [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onDocumentChanged](#onDocumentChanged(android.app.appsearch.observer.DocumentChangeInfo))`(`changeInfo:` `[DocumentChangeInfo](/reference/kotlin/android/app/appsearch/observer/DocumentChangeInfo)`)` Callback to trigger after document changes (documents added, updated or removed). |\n| abstract [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onSchemaChanged](#onSchemaChanged(android.app.appsearch.observer.SchemaChangeInfo))`(`changeInfo:` `[SchemaChangeInfo](/reference/kotlin/android/app/appsearch/observer/SchemaChangeInfo)`)` Callback to trigger after schema changes (schema type added, updated or removed). |\n\nPublic methods\n--------------\n\n### onDocumentChanged\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \nAlso in [T Extensions 3](https://developer.android.com/sdkExtensions) \n\n```\nabstract fun onDocumentChanged(changeInfo: DocumentChangeInfo): Unit\n```\n\nCallback to trigger after document changes (documents added, updated or removed).\n\n| Parameters ||\n|--------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `changeInfo` | [DocumentChangeInfo](/reference/kotlin/android/app/appsearch/observer/DocumentChangeInfo): Information about the nature of the change. This value cannot be `null`. |\n\n### onSchemaChanged\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \nAlso in [T Extensions 3](https://developer.android.com/sdkExtensions) \n\n```\nabstract fun onSchemaChanged(changeInfo: SchemaChangeInfo): Unit\n```\n\nCallback to trigger after schema changes (schema type added, updated or removed).\n\n| Parameters ||\n|--------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `changeInfo` | [SchemaChangeInfo](/reference/kotlin/android/app/appsearch/observer/SchemaChangeInfo): Information about the nature of the change. This value cannot be `null`. |"]]
