MediaControllerCompat


public final class MediaControllerCompat


Allows an app to interact with an ongoing media session. Media buttons and other commands can be sent to the session. A callback may be registered to receive updates from the session, such as metadata and play state changes.

A MediaController can be created if you have a MediaSessionCompat.Token from the session owner.

MediaController objects are thread-safe.

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

If MediaControllerCompat is created with a session token from another process, following methods will not work directly after the creation if the session token is not passed through a MediaBrowserCompat:

Summary

Nested types

Callback for receiving updates on from the session.

Holds information about the way volume is handled for this session.

Interface for controlling media playback on a session.

Public constructors

MediaControllerCompat(
    Context context,
    @NonNull MediaSessionCompat session
)

Creates a media controller from a session.

MediaControllerCompat(
    Context context,
    @NonNull MediaSessionCompat.Token sessionToken
)

Creates a media controller from a session token which may have been obtained from another process.

Public methods

void

Adds a queue item from the given description at the end of the play queue of this session.

void
addQueueItem(MediaDescriptionCompat description, int index)

Adds a queue item from the given description at the specified position in the play queue of this session.

void
adjustVolume(int direction, int flags)

Adjusts the volume of the output this session is playing on.

boolean

Sends the specified media button event to the session.

Bundle

Gets the extras for this session.

long

Gets the flags for this session.

Object

Gets the underlying framework android.media.session.MediaController object.

static MediaControllerCompat

Retrieves the MediaControllerCompat set in the activity by setMediaController for sending media key and volume events.

MediaMetadataCompat

Gets the current metadata for this session.

String

Gets the session owner's package name.

MediaControllerCompat.PlaybackInfo

Gets the current playback info for this session.

PlaybackStateCompat

Gets the current playback state for this session.

List<MediaSessionCompat.QueueItem>

Gets the current play queue for this session if one is set.

CharSequence

Gets the queue title for this session.

int

Gets the rating type supported by the session.

int

Gets the repeat mode for this session.

PendingIntent

Gets an intent for launching UI associated with this session if one exists.

@NonNull Bundle

Gets the additional session information which was set when the session was created.

MediaSessionCompat.Token

Gets the token for the session that this controller is connected to.

int

Gets the shuffle mode for this session.

MediaControllerCompat.TransportControls

Gets a TransportControls instance for this session.

boolean

Returns whether captioning is enabled for this session.

boolean

Returns whether the session is ready or not.

void

Adds a callback to receive updates from the Session.

void
registerCallback(
    @NonNull MediaControllerCompat.Callback callback,
    Handler handler
)

Adds a callback to receive updates from the session.

void

Removes the first occurrence of the specified MediaSessionCompat.QueueItem with the given description in the play queue of the associated session.

void
removeQueueItemAt(int index)

This method is deprecated.

Use removeQueueItem instead.

void
sendCommand(
    @NonNull String command,
    @Nullable Bundle params,
    @Nullable ResultReceiver cb
)

Sends a generic command to the session.

static void
setMediaController(
    @NonNull Activity activity,
    MediaControllerCompat mediaController
)

Sets a MediaControllerCompat in the activity for later retrieval via getMediaController.

void
setVolumeTo(int value, int flags)

Sets the volume of the output this session is playing on.

void

Stops receiving updates on the specified callback.

Public constructors

MediaControllerCompat

Added in 1.1.0
public MediaControllerCompat(
    Context context,
    @NonNull MediaSessionCompat session
)

Creates a media controller from a session.

Parameters
@NonNull MediaSessionCompat session

The session to be controlled.

MediaControllerCompat

Added in 1.1.0
public MediaControllerCompat(
    Context context,
    @NonNull MediaSessionCompat.Token sessionToken
)

Creates a media controller from a session token which may have been obtained from another process.

Parameters
@NonNull MediaSessionCompat.Token sessionToken

The token of the session to be controlled.

Public methods

addQueueItem

Added in 1.1.0
public void addQueueItem(MediaDescriptionCompat description)

Adds a queue item from the given description at the end of the play queue of this session. Not all sessions may support this. To know whether the session supports this, get the session's flags with getFlags and check that the flag FLAG_HANDLES_QUEUE_COMMANDS is set.

Parameters
MediaDescriptionCompat description

The MediaDescriptionCompat for creating the MediaSessionCompat.QueueItem to be inserted.

Throws
java.lang.UnsupportedOperationException

If this session doesn't support this.

addQueueItem

Added in 1.1.0
public void addQueueItem(MediaDescriptionCompat description, int index)

Adds a queue item from the given description at the specified position in the play queue of this session. Shifts the queue item currently at that position (if any) and any subsequent queue items to the right (adds one to their indices). Not all sessions may support this. To know whether the session supports this, get the session's flags with getFlags and check that the flag FLAG_HANDLES_QUEUE_COMMANDS is set.

Parameters
MediaDescriptionCompat description

The MediaDescriptionCompat for creating the MediaSessionCompat.QueueItem to be inserted.

int index

The index at which the created MediaSessionCompat.QueueItem is to be inserted.

Throws
java.lang.UnsupportedOperationException

If this session doesn't support this.

adjustVolume

Added in 1.1.0
public void adjustVolume(int direction, int flags)

Adjusts the volume of the output this session is playing on. The direction must be one of ADJUST_LOWER, ADJUST_RAISE, or ADJUST_SAME. The command will be ignored if the session does not support VOLUME_CONTROL_RELATIVE or VOLUME_CONTROL_ABSOLUTE. The flags in AudioManager may be used to affect the handling.

Parameters
int direction

The direction to adjust the volume in.

int flags

Any flags to pass with the command.

See also
getPlaybackInfo

dispatchMediaButtonEvent

Added in 1.1.0
public boolean dispatchMediaButtonEvent(KeyEvent keyEvent)

Sends the specified media button event to the session. Only media keys can be sent by this method, other keys will be ignored.

Parameters
KeyEvent keyEvent

The media button event to dispatch.

Returns
boolean

true if the event was sent to the session, false otherwise.

getExtras

Added in 1.1.0
public Bundle getExtras()

Gets the extras for this session.

getFlags

Added in 1.1.0
public long getFlags()

Gets the flags for this session. Flags are defined in MediaSessionCompat.

Returns
long

The current set of flags for the session.

getMediaController

Added in 1.1.0
public Object getMediaController()

Gets the underlying framework android.media.session.MediaController object.

This method is only supported on API 21+.

Returns
Object

The underlying android.media.session.MediaController object, or null if none.

getMediaController

Added in 1.1.0
public static MediaControllerCompat getMediaController(@NonNull Activity activity)

Retrieves the MediaControllerCompat set in the activity by setMediaController for sending media key and volume events.

This is compatible with getMediaController.

Parameters
@NonNull Activity activity

The activity to get the media controller from, must not be null.

Returns
MediaControllerCompat

The controller which should receive events.

getMetadata

Added in 1.1.0
public MediaMetadataCompat getMetadata()

Gets the current metadata for this session.

Returns
MediaMetadataCompat

The current MediaMetadata or null.

getPackageName

Added in 1.1.0
public String getPackageName()

Gets the session owner's package name.

Returns
String

The package name of of the session owner.

getPlaybackInfo

Added in 1.1.0
public MediaControllerCompat.PlaybackInfo getPlaybackInfo()

Gets the current playback info for this session.

Returns
MediaControllerCompat.PlaybackInfo

The current playback info or null.

getPlaybackState

Added in 1.1.0
public PlaybackStateCompat getPlaybackState()

Gets the current playback state for this session.

If the session is not ready, getExtras on the result of this method may return null.

Returns
PlaybackStateCompat

The current PlaybackState or null

getQueue

Added in 1.1.0
public List<MediaSessionCompat.QueueItemgetQueue()

Gets the current play queue for this session if one is set. If you only care about the current item getMetadata should be used.

Returns
List<MediaSessionCompat.QueueItem>

The current play queue or null.

getQueueTitle

Added in 1.1.0
public CharSequence getQueueTitle()

Gets the queue title for this session.

getRatingType

Added in 1.1.0
public int getRatingType()

Gets the rating type supported by the session. One of:

If the session is not ready, it will return RATING_NONE.

Returns
int

The supported rating type, or RATING_NONE if the value is not set or the session is not ready.

getRepeatMode

Added in 1.1.0
public int getRepeatMode()

Gets the repeat mode for this session.

Returns
int

The latest repeat mode set to the session, REPEAT_MODE_NONE if not set, or REPEAT_MODE_INVALID if the session is not ready yet.

getSessionActivity

Added in 1.1.0
public PendingIntent getSessionActivity()

Gets an intent for launching UI associated with this session if one exists.

Returns
PendingIntent

A PendingIntent to launch UI or null.

getSessionInfo

Added in 1.2.0
public @NonNull Bundle getSessionInfo()

Gets the additional session information which was set when the session was created. The returned Bundle can include additional unchanging information about the session. For example, it can include the version of the session application, or other app-specific unchanging information.

Returns
@NonNull Bundle

The additional session information, or EMPTY if the session didn't set the information or if the session is not ready.

getSessionToken

Added in 1.1.0
public MediaSessionCompat.Token getSessionToken()

Gets the token for the session that this controller is connected to.

Returns
MediaSessionCompat.Token

The session's token.

getShuffleMode

Added in 1.1.0
public int getShuffleMode()

Gets the shuffle mode for this session.

Returns
int

The latest shuffle mode set to the session, or SHUFFLE_MODE_NONE if disabled or not set, or SHUFFLE_MODE_INVALID if the session is not ready yet.

getTransportControls

Added in 1.1.0
public MediaControllerCompat.TransportControls getTransportControls()

Gets a TransportControls instance for this session.

Returns
MediaControllerCompat.TransportControls

A controls instance

isCaptioningEnabled

Added in 1.1.0
public boolean isCaptioningEnabled()

Returns whether captioning is enabled for this session.

If the session is not ready, it will return a false.

Returns
boolean

true if captioning is enabled, false if disabled or not set.

isSessionReady

Added in 1.1.0
public boolean isSessionReady()

Returns whether the session is ready or not.

If the session is not ready, following methods can work incorrectly.

Returns
boolean

true if the session is ready, false otherwise.

See also
onSessionReady

registerCallback

Added in 1.1.0
public void registerCallback(@NonNull MediaControllerCompat.Callback callback)

Adds a callback to receive updates from the Session. Updates will be posted on the caller's thread.

Parameters
@NonNull MediaControllerCompat.Callback callback

The callback object, must not be null.

registerCallback

Added in 1.1.0
public void registerCallback(
    @NonNull MediaControllerCompat.Callback callback,
    Handler handler
)

Adds a callback to receive updates from the session. Updates will be posted on the specified handler's thread.

Parameters
@NonNull MediaControllerCompat.Callback callback

The callback object, must not be null.

Handler handler

The handler to post updates on. If null the callers thread will be used.

removeQueueItem

Added in 1.1.0
public void removeQueueItem(MediaDescriptionCompat description)

Removes the first occurrence of the specified MediaSessionCompat.QueueItem with the given description in the play queue of the associated session. Not all sessions may support this. To know whether the session supports this, get the session's flags with getFlags and check that the flag FLAG_HANDLES_QUEUE_COMMANDS is set.

Parameters
MediaDescriptionCompat description

The MediaDescriptionCompat for denoting the MediaSessionCompat.QueueItem to be removed.

Throws
java.lang.UnsupportedOperationException

If this session doesn't support this.

removeQueueItemAt

Added in 1.1.0
Deprecated in 1.1.0
public void removeQueueItemAt(int index)

Removes an queue item at the specified position in the play queue of this session. Not all sessions may support this. To know whether the session supports this, get the session's flags with getFlags and check that the flag FLAG_HANDLES_QUEUE_COMMANDS is set.

Parameters
int index

The index of the element to be removed.

Throws
java.lang.UnsupportedOperationException

If this session doesn't support this.

sendCommand

Added in 1.1.0
public void sendCommand(
    @NonNull String command,
    @Nullable Bundle params,
    @Nullable ResultReceiver cb
)

Sends a generic command to the session. It is up to the session creator to decide what commands and parameters they will support. As such, commands should only be sent to sessions that the controller owns.

Parameters
@NonNull String command

The command to send

@Nullable Bundle params

Any parameters to include with the command. Can be null.

@Nullable ResultReceiver cb

The callback to receive the result on. Can be null.

setMediaController

Added in 1.1.0
public static void setMediaController(
    @NonNull Activity activity,
    MediaControllerCompat mediaController
)

Sets a MediaControllerCompat in the activity for later retrieval via getMediaController.

On API 21 and later, setMediaController will also be called.

Parameters
@NonNull Activity activity

The activity to set the mediaController in, must not be null.

MediaControllerCompat mediaController

The controller for the session which should receive media keys and volume changes on API 21 and later.

setVolumeTo

Added in 1.1.0
public void setVolumeTo(int value, int flags)

Sets the volume of the output this session is playing on. The command will be ignored if it does not support VOLUME_CONTROL_ABSOLUTE. The flags in AudioManager may be used to affect the handling.

Parameters
int value

The value to set it to, between 0 and the reported max.

int flags

Flags from AudioManager to include with the volume request.

See also
getPlaybackInfo

unregisterCallback

Added in 1.1.0
public void unregisterCallback(@NonNull MediaControllerCompat.Callback callback)

Stops receiving updates on the specified callback. If an update has already been posted you may still receive it after calling this method.

Parameters
@NonNull MediaControllerCompat.Callback callback

The callback to remove