# MediaSessionManager.OnActiveSessionsChangedListener

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# OnActiveSessionsChangedListener

*** ** * ** ***

Kotlin\|[Java](https://developer.android.com/reference/android/media/session/MediaSessionManager.OnActiveSessionsChangedListener "View this page in Java")  

```
interface OnActiveSessionsChangedListener
```

|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [android.media.session.MediaSessionManager.OnActiveSessionsChangedListener](https://developer.android.com/reference/kotlin/android/media/session/MediaSessionManager.OnActiveSessionsChangedListener#) |

Listens for changes to the list of active sessions. This can be added using #addOnActiveSessionsChangedListener.

## Summary

|                                                                                                                                                                                                                                                                 Public methods                                                                                                                                                                                                                                                                  ||
|--------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onActiveSessionsChanged](https://developer.android.com/reference/kotlin/android/media/session/MediaSessionManager.OnActiveSessionsChangedListener#onActiveSessionsChanged(kotlin.collections.MutableList))`(`controllers:` `[MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)<[MediaController](https://developer.android.com/reference/kotlin/android/media/session/MediaController)!>?`)` <br /> |

## Public methods

### onActiveSessionsChanged

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
abstract fun onActiveSessionsChanged(controllers: MutableList<MediaController!>?): Unit
```

|                                                                                                                          Parameters                                                                                                                          ||
|---------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `controllers` | [MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)\<[MediaController](https://developer.android.com/reference/kotlin/android/media/session/MediaController)!\>?:This value may be`null`. |