Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

# android.app.appsearch.observer

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## Interfaces

|---|---|
| [ObserverCallback](https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback) | An interface which apps can implement to subscribe to notifications of changes to AppSearch data. |

## Classes

|---|---|
| [DocumentChangeInfo](https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo) | Contains information about an individual change detected by an `https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback`. |
| [ObserverSpec](https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec) | Configures the types, namespaces and other properties that `https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback` instances match against. |
| [ObserverSpec.Builder](https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec.Builder) | Builder for `https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec` instances. |
| [SchemaChangeInfo](https://developer.android.com/reference/android/app/appsearch/observer/SchemaChangeInfo) | Contains information about a schema change detected by an `https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback`. |

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  ## Interfaces

  - [ObserverCallback](https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback)
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  ## Classes

  - [DocumentChangeInfo](https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo)
  - [ObserverSpec](https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec)
  - [ObserverSpec.Builder](https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec.Builder)
  - [SchemaChangeInfo](https://developer.android.com/reference/android/app/appsearch/observer/SchemaChangeInfo)