Skip to content

Most visited

Recently visited

navigation
added in version 22.1.0
belongs to Maven artifact com.android.support:support-media-compat:27.0.0

MediaSessionCompat

public class MediaSessionCompat
extends Object

java.lang.Object
   ↳ android.support.v4.media.session.MediaSessionCompat


Allows interaction with media controllers, volume keys, media buttons, and transport controls.

A MediaSession should be created when an app wants to publish media playback information or handle media keys. In general an app only needs one session for all playback, though multiple sessions can be created to provide finer grain controls of media.

Once a session is created the owner of the session may pass its session token to other processes to allow them to create a MediaControllerCompat to interact with the session.

To receive commands, media keys, and other events a MediaSessionCompat.Callback must be set with setCallback(Callback).

When an app is finished performing playback it must call release() to clean up the session and notify any controllers.

MediaSessionCompat objects are not thread safe and all calls should be made from the same thread.

This is a helper for accessing features in MediaSession introduced after API level 4 in a backwards compatible fashion.

Developer Guides

For information about building your media application, read the Media Apps developer guide.

Summary

Nested classes

class MediaSessionCompat.Callback

Receives transport controls, media buttons, and commands from controllers and the system. 

interface MediaSessionCompat.OnActiveChangeListener

 

class MediaSessionCompat.QueueItem

A single item that is part of the play queue. 

class MediaSessionCompat.Token

Represents an ongoing session. 

Constants

String ACTION_FLAG_AS_INAPPROPRIATE

Predefined custom action to flag the media that is currently playing as inappropriate.

String ACTION_FOLLOW

Predefined custom action to follow an artist, album, or playlist.

String ACTION_SKIP_AD

Predefined custom action to skip the advertisement that is currently playing.

String ACTION_UNFOLLOW

Predefined custom action to unfollow an artist, album, or playlist.

String ARGUMENT_MEDIA_ATTRIBUTE

Argument to indicate the media attribute.

String ARGUMENT_MEDIA_ATTRIBUTE_VALUE

String argument to indicate the value of the media attribute (e.g., the name of the artist).

int FLAG_HANDLES_MEDIA_BUTTONS

Sets this flag on the session to indicate that it can handle media button events.

int FLAG_HANDLES_QUEUE_COMMANDS

Sets this flag on the session to indicate that it handles queue management commands through its MediaSessionCompat.Callback.

int FLAG_HANDLES_TRANSPORT_CONTROLS

Sets this flag on the session to indicate that it handles transport control commands through its MediaSessionCompat.Callback.

int MEDIA_ATTRIBUTE_ALBUM

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the album.

int MEDIA_ATTRIBUTE_ARTIST

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the artist.

int MEDIA_ATTRIBUTE_PLAYLIST

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the playlist.

Public constructors

MediaSessionCompat(Context context, String tag)

Creates a new session.

MediaSessionCompat(Context context, String tag, ComponentName mbrComponent, PendingIntent mbrIntent)

Creates a new session with a specified media button receiver (a component name and/or a pending intent).

Public methods

void addOnActiveChangeListener(MediaSessionCompat.OnActiveChangeListener listener)

Adds a listener to be notified when the active status of this session changes.

static MediaSessionCompat fromMediaSession(Context context, Object mediaSession)

Creates an instance from a framework MediaSession object.

MediaControllerCompat getController()

Gets a controller for this session.

Object getMediaSession()

Gets the underlying framework MediaSession object.

Object getRemoteControlClient()

Gets the underlying framework RemoteControlClient object.

MediaSessionCompat.Token getSessionToken()

Retrieves a token object that can be used by apps to create a MediaControllerCompat for interacting with this session.

boolean isActive()

Gets the current active state of this session.

void release()

This must be called when an app has finished performing playback.

void removeOnActiveChangeListener(MediaSessionCompat.OnActiveChangeListener listener)

Stops the listener from being notified when the active status of this session changes.

void sendSessionEvent(String event, Bundle extras)

Sends a proprietary event to all MediaControllers listening to this Session.

void setActive(boolean active)

Sets if this session is currently active and ready to receive commands.

void setCallback(MediaSessionCompat.Callback callback, Handler handler)

Sets the callback to receive updates for the MediaSession.

void setCallback(MediaSessionCompat.Callback callback)

Adds a callback to receive updates on for the MediaSession.

void setCaptioningEnabled(boolean enabled)

Enables/disables captioning for this session.

void setExtras(Bundle extras)

Sets some extras that can be associated with the MediaSessionCompat.

void setFlags(int flags)

Sets any flags for the session.

void setMediaButtonReceiver(PendingIntent mbr)

Sets a pending intent for your media button receiver to allow restarting playback after the session has been stopped.

void setMetadata(MediaMetadataCompat metadata)

Updates the current metadata.

void setPlaybackState(PlaybackStateCompat state)

Updates the current playback state.

void setPlaybackToLocal(int stream)

Sets the stream this session is playing on.

void setPlaybackToRemote(VolumeProviderCompat volumeProvider)

Configures this session to use remote volume handling.

void setQueue(List<MediaSessionCompat.QueueItem> queue)

Updates the list of items in the play queue.

void setQueueTitle(CharSequence title)

Sets the title of the play queue.

void setRatingType(int type)

Sets the style of rating used by this session.

void setRepeatMode(int repeatMode)

Sets the repeat mode for this session.

void setSessionActivity(PendingIntent pi)

Sets an intent for launching UI for this Session.

void setShuffleMode(int shuffleMode)

Sets the shuffle mode for this session.

Inherited methods

From class java.lang.Object

Constants

ACTION_FLAG_AS_INAPPROPRIATE

added in version 25.4.0
String ACTION_FLAG_AS_INAPPROPRIATE

Predefined custom action to flag the media that is currently playing as inappropriate.

See also:

Constant Value: "android.support.v4.media.session.action.FLAG_AS_INAPPROPRIATE"

ACTION_FOLLOW

added in version 26.1.0
String ACTION_FOLLOW

Predefined custom action to follow an artist, album, or playlist. The extra bundle must have ARGUMENT_MEDIA_ATTRIBUTE to indicate the type of the follow action. The bundle can also have an optional string argument, ARGUMENT_MEDIA_ATTRIBUTE_VALUE, to specify the target to follow (e.g., the name of the artist to follow). If this argument is omitted, the currently playing media will be the target of the action. Thus, the session must perform the follow action with the current metadata. If there's no specified attribute in the current metadata, the controller must not omit this argument.

See also:

Constant Value: "android.support.v4.media.session.action.FOLLOW"

ACTION_SKIP_AD

added in version 25.4.0
String ACTION_SKIP_AD

Predefined custom action to skip the advertisement that is currently playing.

See also:

Constant Value: "android.support.v4.media.session.action.SKIP_AD"

ACTION_UNFOLLOW

added in version 26.1.0
String ACTION_UNFOLLOW

Predefined custom action to unfollow an artist, album, or playlist. The extra bundle must have ARGUMENT_MEDIA_ATTRIBUTE to indicate the type of the unfollow action. The bundle can also have an optional string argument, ARGUMENT_MEDIA_ATTRIBUTE_VALUE, to specify the target to unfollow (e.g., the name of the artist to unfollow). If this argument is omitted, the currently playing media will be the target of the action. Thus, the session must perform the unfollow action with the current metadata. If there's no specified attribute in the current metadata, the controller must not omit this argument.

See also:

Constant Value: "android.support.v4.media.session.action.UNFOLLOW"

ARGUMENT_MEDIA_ATTRIBUTE

added in version 26.1.0
String ARGUMENT_MEDIA_ATTRIBUTE

Argument to indicate the media attribute. It should be one of the following:

Constant Value: "android.support.v4.media.session.ARGUMENT_MEDIA_ATTRIBUTE"

ARGUMENT_MEDIA_ATTRIBUTE_VALUE

added in version 26.1.0
String ARGUMENT_MEDIA_ATTRIBUTE_VALUE

String argument to indicate the value of the media attribute (e.g., the name of the artist).

Constant Value: "android.support.v4.media.session.ARGUMENT_MEDIA_ATTRIBUTE_VALUE"

FLAG_HANDLES_MEDIA_BUTTONS

added in version 22.1.0
int FLAG_HANDLES_MEDIA_BUTTONS

Sets this flag on the session to indicate that it can handle media button events.

Constant Value: 1 (0x00000001)

FLAG_HANDLES_QUEUE_COMMANDS

added in version 25.4.0
int FLAG_HANDLES_QUEUE_COMMANDS

Sets this flag on the session to indicate that it handles queue management commands through its MediaSessionCompat.Callback.

Constant Value: 4 (0x00000004)

FLAG_HANDLES_TRANSPORT_CONTROLS

added in version 22.1.0
int FLAG_HANDLES_TRANSPORT_CONTROLS

Sets this flag on the session to indicate that it handles transport control commands through its MediaSessionCompat.Callback.

Constant Value: 2 (0x00000002)

MEDIA_ATTRIBUTE_ALBUM

added in version 26.1.0
int MEDIA_ATTRIBUTE_ALBUM

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the album.

See also:

Constant Value: 1 (0x00000001)

MEDIA_ATTRIBUTE_ARTIST

added in version 26.1.0
int MEDIA_ATTRIBUTE_ARTIST

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the artist.

See also:

Constant Value: 0 (0x00000000)

MEDIA_ATTRIBUTE_PLAYLIST

added in version 26.1.0
int MEDIA_ATTRIBUTE_PLAYLIST

The value of ARGUMENT_MEDIA_ATTRIBUTE indicating the playlist.

See also:

Constant Value: 2 (0x00000002)

Public constructors

MediaSessionCompat

added in version 24.1.0
MediaSessionCompat (Context context, 
                String tag)

Creates a new session. You must call release() when finished with the session.

The session will automatically be registered with the system but will not be published until setActive(true) is called.

For API 20 or earlier, note that a media button receiver is required for handling ACTION_MEDIA_BUTTON. This constructor will attempt to find an appropriate BroadcastReceiver from your manifest. See MediaButtonReceiver for more details.

Parameters
context Context: The context to use to create the session.

tag String: A short name for debugging purposes.

MediaSessionCompat

added in version 22.1.0
MediaSessionCompat (Context context, 
                String tag, 
                ComponentName mbrComponent, 
                PendingIntent mbrIntent)

Creates a new session with a specified media button receiver (a component name and/or a pending intent). You must call release() when finished with the session.

The session will automatically be registered with the system but will not be published until setActive(true) is called.

For API 20 or earlier, note that a media button receiver is required for handling ACTION_MEDIA_BUTTON. This constructor will attempt to find an appropriate BroadcastReceiver from your manifest if it's not specified. See MediaButtonReceiver for more details.

Parameters
context Context: The context to use to create the session.

tag String: A short name for debugging purposes.

mbrComponent ComponentName: The component name for your media button receiver.

mbrIntent PendingIntent: The PendingIntent for your receiver component that handles media button events. This is optional and will be used on between JELLY_BEAN_MR2 and KITKAT_WATCH instead of the component name.

Public methods

addOnActiveChangeListener

added in version 22.1.0
void addOnActiveChangeListener (MediaSessionCompat.OnActiveChangeListener listener)

Adds a listener to be notified when the active status of this session changes. This is primarily used by the support library and should not be needed by apps.

Parameters
listener MediaSessionCompat.OnActiveChangeListener: The listener to add.

fromMediaSession

added in version 25.1.0
MediaSessionCompat fromMediaSession (Context context, 
                Object mediaSession)

Creates an instance from a framework MediaSession object.

This method is only supported on API 21+. On API 20 and below, it returns null.

Parameters
context Context: The context to use to create the session.

mediaSession Object: A MediaSession object.

Returns
MediaSessionCompat An equivalent MediaSessionCompat object, or null if none.

getController

added in version 22.1.0
MediaControllerCompat getController ()

Gets a controller for this session. This is a convenience method to avoid having to cache your own controller in process.

Returns
MediaControllerCompat A controller for this session.

getMediaSession

added in version 22.1.0
Object getMediaSession ()

Gets the underlying framework MediaSession object.

This method is only supported on API 21+.

Returns
Object The underlying MediaSession object, or null if none.

getRemoteControlClient

added in version 22.1.0
Object getRemoteControlClient ()

Gets the underlying framework RemoteControlClient object.

This method is only supported on APIs 14-20. On API 21+ getMediaSession() should be used instead.

Returns
Object The underlying RemoteControlClient object, or null if none.

getSessionToken

added in version 22.1.0
MediaSessionCompat.Token getSessionToken ()

Retrieves a token object that can be used by apps to create a MediaControllerCompat for interacting with this session. The owner of the session is responsible for deciding how to distribute these tokens.

On platform versions before LOLLIPOP this token may only be used within your app as there is no way to guarantee other apps are using the same version of the support library.

Returns
MediaSessionCompat.Token A token that can be used to create a media controller for this session.

isActive

added in version 22.1.0
boolean isActive ()

Gets the current active state of this session.

Returns
boolean True if the session is active, false otherwise.

release

added in version 22.1.0
void release ()

This must be called when an app has finished performing playback. If playback is expected to start again shortly the session can be left open, but it must be released if your activity or service is being destroyed.

removeOnActiveChangeListener

added in version 22.1.0
void removeOnActiveChangeListener (MediaSessionCompat.OnActiveChangeListener listener)

Stops the listener from being notified when the active status of this session changes.

Parameters
listener MediaSessionCompat.OnActiveChangeListener: The listener to remove.

sendSessionEvent

added in version 22.1.0
void sendSessionEvent (String event, 
                Bundle extras)

Sends a proprietary event to all MediaControllers listening to this Session. It's up to the Controller/Session owner to determine the meaning of any events.

Parameters
event String: The name of the event to send

extras Bundle: Any extras included with the event

setActive

added in version 22.1.0
void setActive (boolean active)

Sets if this session is currently active and ready to receive commands. If set to false your session's controller may not be discoverable. You must set the session to active before it can start receiving media button events or transport commands.

On platforms earlier than LOLLIPOP, a media button event receiver should be set via the constructor to receive media button events.

Parameters
active boolean: Whether this session is active or not.

setCallback

added in version 22.1.0
void setCallback (MediaSessionCompat.Callback callback, 
                Handler handler)

Sets the callback to receive updates for the MediaSession. This includes media button and volume events. Set the callback to null to stop receiving events.

Parameters
callback MediaSessionCompat.Callback: The callback to receive updates on.

handler Handler: The handler that events should be posted on.

setCallback

added in version 22.1.0
void setCallback (MediaSessionCompat.Callback callback)

Adds a callback to receive updates on for the MediaSession. This includes media button and volume events. The caller's thread will be used to post events.

Parameters
callback MediaSessionCompat.Callback: The callback object

setCaptioningEnabled

added in version 25.4.0
void setCaptioningEnabled (boolean enabled)

Enables/disables captioning for this session.

Parameters
enabled boolean: true to enable captioning, false to disable.

setExtras

added in version 22.1.0
void setExtras (Bundle extras)

Sets some extras that can be associated with the MediaSessionCompat. No assumptions should be made as to how a MediaControllerCompat will handle these extras. Keys should be fully qualified (e.g. com.example.MY_EXTRA) to avoid conflicts.

Parameters
extras Bundle: The extras associated with the session.

setFlags

added in version 22.1.0
void setFlags (int flags)

Sets any flags for the session.

Parameters
flags int: The flags to set for this session.

setMediaButtonReceiver

added in version 22.1.0
void setMediaButtonReceiver (PendingIntent mbr)

Sets a pending intent for your media button receiver to allow restarting playback after the session has been stopped. If your app is started in this way an ACTION_MEDIA_BUTTON intent will be sent via the pending intent.

This method will only work on LOLLIPOP and later. Earlier platform versions must include the media button receiver in the constructor.

Parameters
mbr PendingIntent: The PendingIntent to send the media button event to.

setMetadata

added in version 22.1.0
void setMetadata (MediaMetadataCompat metadata)

Updates the current metadata. New metadata can be created using MediaMetadataCompat.Builder. This operation may take time proportional to the size of the bitmap to replace large bitmaps with a scaled down copy.

Parameters
metadata MediaMetadataCompat: The new metadata

See also:

setPlaybackState

added in version 22.1.0
void setPlaybackState (PlaybackStateCompat state)

Updates the current playback state.

Parameters
state PlaybackStateCompat: The current state of playback

setPlaybackToLocal

added in version 22.1.0
void setPlaybackToLocal (int stream)

Sets the stream this session is playing on. This will affect the system's volume handling for this session. If setPlaybackToRemote(VolumeProviderCompat) was previously called it will stop receiving volume commands and the system will begin sending volume changes to the appropriate stream.

By default sessions are on STREAM_MUSIC.

Parameters
stream int: The AudioManager stream this session is playing on.

setPlaybackToRemote

added in version 22.1.0
void setPlaybackToRemote (VolumeProviderCompat volumeProvider)

Configures this session to use remote volume handling. This must be called to receive volume button events, otherwise the system will adjust the current stream volume for this session. If setPlaybackToLocal(int) was previously called that stream will stop receiving volume changes for this session.

On platforms earlier than LOLLIPOP this will only allow an app to handle volume commands sent directly to the session by a MediaControllerCompat. System routing of volume keys will not use the volume provider.

Parameters
volumeProvider VolumeProviderCompat: The provider that will handle volume changes. May not be null.

setQueue

added in version 22.1.0
void setQueue (List<MediaSessionCompat.QueueItem> queue)

Updates the list of items in the play queue. It is an ordered list and should contain the current item, and previous or upcoming items if they exist. Specify null if there is no current play queue.

The queue should be of reasonable size. If the play queue is unbounded within your app, it is better to send a reasonable amount in a sliding window instead.

Parameters
queue List: A list of items in the play queue.

setQueueTitle

added in version 22.1.0
void setQueueTitle (CharSequence title)

Sets the title of the play queue. The UI should display this title along with the play queue itself. e.g. "Play Queue", "Now Playing", or an album name.

Parameters
title CharSequence: The title of the play queue.

setRatingType

added in version 22.1.0
void setRatingType (int type)

Sets the style of rating used by this session. Apps trying to set the rating should use this style. Must be one of the following:

Parameters
type int

setRepeatMode

added in version 25.4.0
void setRepeatMode (int repeatMode)

Sets the repeat mode for this session.

Note that if this method is not called before, getRepeatMode() will return REPEAT_MODE_NONE.

Parameters
repeatMode int: The repeat mode. Must be one of the followings: REPEAT_MODE_NONE, REPEAT_MODE_ONE, REPEAT_MODE_ALL, REPEAT_MODE_GROUP

setSessionActivity

added in version 22.1.0
void setSessionActivity (PendingIntent pi)

Sets an intent for launching UI for this Session. This can be used as a quick link to an ongoing media screen. The intent should be for an activity that may be started using startActivity(Intent).

Parameters
pi PendingIntent: The intent to launch to show UI for this Session.

setShuffleMode

added in version 26.1.0
void setShuffleMode (int shuffleMode)

Sets the shuffle mode for this session.

Note that if this method is not called before, getShuffleMode() will return SHUFFLE_MODE_NONE.

Parameters
shuffleMode int: The shuffle mode. Must be one of the followings: SHUFFLE_MODE_NONE, SHUFFLE_MODE_ALL, SHUFFLE_MODE_GROUP

This site uses cookies to store your preferences for site-specific language and display options.

Get the latest Android developer news and tips that will help you find success on Google Play.

* Required Fields

Hooray!

Follow Google Developers on WeChat

Browse this site in ?

You requested a page in , but your language preference for this site is .

Would you like to change your language preference and browse this site in ? If you want to change your language preference later, use the language menu at the bottom of each page.

This class requires API level or higher

This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

Take a short survey?
Help us improve the Android developer experience. (Dec 2017 Android Platform & Tools Survey)