Added in API level 21

Callback


abstract class Callback
kotlin.Any
   ↳ android.media.session.MediaSession.Callback

Receives media buttons, transport controls, and commands from controllers and the system. A callback may be set using #setCallback.

Summary

Public constructors

Public methods
open Unit
onCommand(command: String, args: Bundle?, cb: ResultReceiver?)

Called when a controller has sent a command to this session.

open Unit
onCustomAction(action: String, extras: Bundle?)

Called when a MediaController wants a PlaybackState.CustomAction to be performed.

open Unit

Override to handle requests to fast forward.

open Boolean
onMediaButtonEvent(mediaButtonIntent: Intent)

Called when a media button is pressed and this session has the highest priority or a controller sends a media button event to the session.

open Unit

Override to handle requests to pause playback.

open Unit

Override to handle requests to begin playback.

open Unit
onPlayFromMediaId(mediaId: String!, extras: Bundle!)

Override to handle requests to play a specific mediaId that was provided by your app's MediaBrowserService.

open Unit
onPlayFromSearch(query: String!, extras: Bundle!)

Override to handle requests to begin playback from a search query.

open Unit
onPlayFromUri(uri: Uri!, extras: Bundle!)

Override to handle requests to play a specific media item represented by a URI.

open Unit

Override to handle requests to prepare playback.

open Unit
onPrepareFromMediaId(mediaId: String!, extras: Bundle!)

Override to handle requests to prepare for playing a specific mediaId that was provided by your app's MediaBrowserService.

open Unit
onPrepareFromSearch(query: String!, extras: Bundle!)

Override to handle requests to prepare playback from a search query.

open Unit
onPrepareFromUri(uri: Uri!, extras: Bundle!)

Override to handle requests to prepare a specific media item represented by a URI.

open Unit

Override to handle requests to rewind.

open Unit
onSeekTo(pos: Long)

Override to handle requests to seek to a specific position in ms.

open Unit

Override to handle the playback speed change.

open Unit

Override to handle the item being rated.

open Unit

Override to handle requests to skip to the next media item.

open Unit

Override to handle requests to skip to the previous media item.

open Unit

Override to handle requests to play an item with a given id from the play queue.

open Unit

Override to handle requests to stop playback.

Public constructors

Callback

Added in API level 21
Callback()

Public methods

onCommand

Added in API level 21
open fun onCommand(
    command: String,
    args: Bundle?,
    cb: ResultReceiver?
): Unit

Called when a controller has sent a command to this session. The owner of the session may handle custom commands but is not required to.

Parameters
command String: The command name. This value cannot be null.
args Bundle?: Optional parameters for the command, may be null.
cb ResultReceiver?: A result receiver to which a result may be sent by the command, may be null.

onCustomAction

Added in API level 21
open fun onCustomAction(
    action: String,
    extras: Bundle?
): Unit

Called when a MediaController wants a PlaybackState.CustomAction to be performed.

Parameters
action String: The action that was originally sent in the PlaybackState.CustomAction. This value cannot be null.
extras Bundle?: Optional extras specified by the MediaController. This value may be null.

onFastForward

Added in API level 21
open fun onFastForward(): Unit

Override to handle requests to fast forward.

onMediaButtonEvent

Added in API level 21
open fun onMediaButtonEvent(mediaButtonIntent: Intent): Boolean

Called when a media button is pressed and this session has the highest priority or a controller sends a media button event to the session. The default behavior will call the relevant method if the action for it was set.

The intent will be of type Intent#ACTION_MEDIA_BUTTON with a KeyEvent in Intent#EXTRA_KEY_EVENT

Parameters
mediaButtonIntent Intent: an intent containing the KeyEvent as an extra This value cannot be null.
Return
Boolean True if the event was handled, false otherwise.

onPause

Added in API level 21
open fun onPause(): Unit

Override to handle requests to pause playback.

onPlay

Added in API level 21
open fun onPlay(): Unit

Override to handle requests to begin playback.

onPlayFromMediaId

Added in API level 21
open fun onPlayFromMediaId(
    mediaId: String!,
    extras: Bundle!
): Unit

Override to handle requests to play a specific mediaId that was provided by your app's MediaBrowserService.

onPlayFromSearch

Added in API level 21
open fun onPlayFromSearch(
    query: String!,
    extras: Bundle!
): Unit

Override to handle requests to begin playback from a search query. An empty query indicates that the app may play any music. The implementation should attempt to make a smart choice about what to play.

onPlayFromUri

Added in API level 23
open fun onPlayFromUri(
    uri: Uri!,
    extras: Bundle!
): Unit

Override to handle requests to play a specific media item represented by a URI.

onPrepare

Added in API level 24
open fun onPrepare(): Unit

Override to handle requests to prepare playback. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done.

onPrepareFromMediaId

Added in API level 24
open fun onPrepareFromMediaId(
    mediaId: String!,
    extras: Bundle!
): Unit

Override to handle requests to prepare for playing a specific mediaId that was provided by your app's MediaBrowserService. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay. Override onPlayFromMediaId to handle requests for starting playback without preparation.

onPrepareFromSearch

Added in API level 24
open fun onPrepareFromSearch(
    query: String!,
    extras: Bundle!
): Unit

Override to handle requests to prepare playback from a search query. An empty query indicates that the app may prepare any music. The implementation should attempt to make a smart choice about what to play. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay. Override onPlayFromSearch to handle requests for starting playback without preparation.

onPrepareFromUri

Added in API level 24
open fun onPrepareFromUri(
    uri: Uri!,
    extras: Bundle!
): Unit

Override to handle requests to prepare a specific media item represented by a URI. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay. Override onPlayFromUri to handle requests for starting playback without preparation.

onRewind

Added in API level 21
open fun onRewind(): Unit

Override to handle requests to rewind.

onSeekTo

Added in API level 21
open fun onSeekTo(pos: Long): Unit

Override to handle requests to seek to a specific position in ms.

Parameters
pos Long: New position to move to, in milliseconds.

onSetPlaybackSpeed

Added in API level 29
open fun onSetPlaybackSpeed(speed: Float): Unit

Override to handle the playback speed change. To update the new playback speed, create a new PlaybackState by using android.media.session.PlaybackState.Builder#setState(int,long,float), and set it with setPlaybackState(android.media.session.PlaybackState).

A value of 1.0f is the default playback value, and a negative value indicates reverse playback. The speed will not be equal to zero.

Parameters
speed Float: the playback speed

onSetRating

Added in API level 21
open fun onSetRating(rating: Rating): Unit

Override to handle the item being rated.

Parameters
rating Rating: This value cannot be null.

onSkipToNext

Added in API level 21
open fun onSkipToNext(): Unit

Override to handle requests to skip to the next media item.

onSkipToPrevious

Added in API level 21
open fun onSkipToPrevious(): Unit

Override to handle requests to skip to the previous media item.

onSkipToQueueItem

Added in API level 21
open fun onSkipToQueueItem(id: Long): Unit

Override to handle requests to play an item with a given id from the play queue.

onStop

Added in API level 21
open fun onStop(): Unit

Override to handle requests to stop playback.