Callback

Kotlin |Java

abstract class Callback

kotlin.Any
↳	android.media.session.MediaController.Callback

Callback for receiving updates from the session. A Callback can be registered using #registerCallback.

Summary

Public constructors
`Callback()`

Public methods
open Unit	`onAudioInfoChanged(playbackInfo: MediaController.PlaybackInfo)` Signals a change in the session's `PlaybackInfo`.
open Unit	`onExtrasChanged(extras: Bundle?)` Override to handle changes to the `MediaSession` extras.
open Unit	`onMetadataChanged(metadata: MediaMetadata?)` Override to handle changes to the current metadata.
open Unit	`onPlaybackStateChanged(state: PlaybackState?)` Override to handle changes in playback state.
open Unit	`onQueueChanged(queue: MutableList<MediaSession.QueueItem!>?)` Override to handle changes to items in the queue.
open Unit	`onQueueTitleChanged(title: CharSequence?)` Override to handle changes to the queue title.
open Unit	`onSessionDestroyed()` Override to handle the session being destroyed.
open Unit	`onSessionEvent(event: String, extras: Bundle?)` Override to handle custom events sent by the session owner without a specified interface.

Callback()

open fun onAudioInfoChanged(playbackInfo: MediaController.PlaybackInfo): Unit

Signals a change in the session's PlaybackInfo.

Parameters
`playbackInfo`	MediaController.PlaybackInfo: The latest known state of the session's playback info. This value cannot be `null`.

open fun onExtrasChanged(extras: Bundle?): Unit

Override to handle changes to the MediaSession extras.

Parameters
`extras`	Bundle?: The extras that can include other information associated with the `MediaSession`. This value may be `null`.

open fun onMetadataChanged(metadata: MediaMetadata?): Unit

Override to handle changes to the current metadata.

Parameters
`metadata`	MediaMetadata?: The current metadata for the session or null if none.

See Also

open fun onPlaybackStateChanged(state: PlaybackState?): Unit

Override to handle changes in playback state.

Parameters
`state`	PlaybackState?: The new playback state of the session This value may be `null`.

open fun onQueueChanged(queue: MutableList<MediaSession.QueueItem!>?): Unit

Override to handle changes to items in the queue.

Parameters
`queue`	MutableList<MediaSession.QueueItem!>?: A list of items in the current play queue. It should include the currently playing item as well as previous and upcoming items if applicable. This value may be `null`.

See Also

open fun onQueueTitleChanged(title: CharSequence?): Unit

Override to handle changes to the queue title.

Parameters
`title`	CharSequence?: The title that should be displayed along with the play queue such as "Now Playing". May be null if there is no such title.

open fun onSessionDestroyed(): Unit

Override to handle the session being destroyed. The session is no longer valid after this call and calls to it will be ignored.

open fun onSessionEvent(
    event: String, 
    extras: Bundle?
): Unit

Override to handle custom events sent by the session owner without a specified interface. Controllers should only handle these for sessions they own.

Parameters
`event`	String: The event from the session. This value cannot be `null`.
`extras`	Bundle?: Optional parameters for the event, may be null.