MediaBrowserCompat

Kotlin |Java

class MediaBrowserCompat

kotlin.Any
↳	android.support.v4.media.MediaBrowserCompat

Browses media content offered by a MediaBrowserServiceCompat.

This object is not thread-safe. All calls should happen on the thread on which the browser was constructed.

All callback methods will be called from the thread on which the browser was constructed.

Developer Guides

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

Summary

Nested classes
	ConnectionCallback Callbacks for connection related events.
abstract	CustomActionCallback Callback for receiving the result of sendCustomAction.
abstract	ItemCallback Callback for receiving the result of getItem.
	MediaItem A class with information on a single media item for use in browsing/searching media.
abstract	SearchCallback Callback for receiving the result of search.
abstract	SubscriptionCallback Callbacks for subscription related events.

Constants
static String	CUSTOM_ACTION_DOWNLOAD Predefined custom action to ask the connected service to download a specific MediaItem for offline playback.
static String	CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE Predefined custom action to ask the connected service to remove the downloaded file of MediaItem by the download action.
static String	EXTRA_DOWNLOAD_PROGRESS Used as a float extra field to denote the current progress during download.
static String	EXTRA_MEDIA_ID Used as a string extra field to denote the target MediaItem.
static String	EXTRA_PAGE Used as an int extra field to denote the page number to subscribe.
static String	EXTRA_PAGE_SIZE Used as an int extra field to denote the number of media items in a page.

Public constructors
<init>(context: Context!, serviceComponent: ComponentName!, callback: MediaBrowserCompat.ConnectionCallback!, rootHints: Bundle!) Creates a media browser for the specified media browse service.

Public methods
Unit	connect() Connects to the media browse service.
Unit	disconnect() Disconnects from the media browse service.
Bundle?	getExtras() Gets any extras for the media service.
Unit	getItem(@NonNull mediaId: String, @NonNull cb: MediaBrowserCompat.ItemCallback) Retrieves a specific MediaItem from the connected service.
String	getRoot() Gets the root id.
ComponentName	getServiceComponent() Gets the service component that the media browser is connected to.
MediaSessionCompat.Token	getSessionToken() Gets the media session token associated with the media browser.
Boolean	isConnected() Returns whether the browser is connected to the service.
Unit	search(@NonNull query: String, extras: Bundle!, @NonNull callback: MediaBrowserCompat.SearchCallback) Searches media items from the connected service.
Unit	sendCustomAction(@NonNull action: String, extras: Bundle!, @Nullable callback: MediaBrowserCompat.CustomActionCallback?) Sends a custom action to the connected service.
Unit	subscribe(@NonNull parentId: String, @NonNull callback: MediaBrowserCompat.SubscriptionCallback) Queries for information about the media items that are contained within the specified id and subscribes to receive updates when they change.
Unit	subscribe(@NonNull parentId: String, @NonNull options: Bundle, @NonNull callback: MediaBrowserCompat.SubscriptionCallback) Queries with service-specific arguments for information about the media items that are contained within the specified id and subscribes to receive updates when they change.
Unit	unsubscribe(@NonNull parentId: String) Unsubscribes for changes to the children of the specified media id.
Unit	unsubscribe(@NonNull parentId: String, @NonNull callback: MediaBrowserCompat.SubscriptionCallback) Unsubscribes for changes to the children of the specified media id.

Constants

CUSTOM_ACTION_DOWNLOAD

static val CUSTOM_ACTION_DOWNLOAD: String

Predefined custom action to ask the connected service to download a specific MediaItem for offline playback. The id of the media item must be passed in an extra bundle. The download progress might be delivered to the browser via CustomActionCallback#onProgressUpdate.

Value: "android.support.v4.media.action.DOWNLOAD"

See Also

• #EXTRA_MEDIA_ID#EXTRA_DOWNLOAD_PROGRESS#CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE

CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE

static val CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE: String

Predefined custom action to ask the connected service to remove the downloaded file of MediaItem by the download action. The id of the media item must be passed in an extra bundle.

Value: "android.support.v4.media.action.REMOVE_DOWNLOADED_FILE"

See Also

• #EXTRA_MEDIA_ID#CUSTOM_ACTION_DOWNLOAD

EXTRA_DOWNLOAD_PROGRESS

static val EXTRA_DOWNLOAD_PROGRESS: String

Used as a float extra field to denote the current progress during download. The value of this field must be a float number within [0.0, 1.0].

Value: "android.media.browse.extra.DOWNLOAD_PROGRESS"

See Also

• #CUSTOM_ACTION_DOWNLOADCustomActionCallback#onProgressUpdate

EXTRA_MEDIA_ID

static val EXTRA_MEDIA_ID: String

Used as a string extra field to denote the target MediaItem.

Value: "android.media.browse.extra.MEDIA_ID"

See Also

• #CUSTOM_ACTION_DOWNLOAD#CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE

EXTRA_PAGE

static val EXTRA_PAGE: String

Used as an int extra field to denote the page number to subscribe. The value of EXTRA_PAGE should be greater than or equal to 0.

Value: "android.media.browse.extra.PAGE"

See Also

• android.service.media.MediaBrowserService.BrowserRoot#EXTRA_PAGE_SIZE

EXTRA_PAGE_SIZE

static val EXTRA_PAGE_SIZE: String

Used as an int extra field to denote the number of media items in a page. The value of EXTRA_PAGE_SIZE should be greater than or equal to 1.

Value: "android.media.browse.extra.PAGE_SIZE"

See Also

• android.service.media.MediaBrowserService.BrowserRoot#EXTRA_PAGE

Public constructors

<init>

MediaBrowserCompat(context: Context!, serviceComponent: ComponentName!, callback: MediaBrowserCompat.ConnectionCallback!, rootHints: Bundle!)

Creates a media browser for the specified media browse service.

Parameters
context	Context!: The context.
serviceComponent	Context!: The component name of the media browse service.
callback	Context!: The connection callback.
rootHints	Context!: An optional bundle of service-specific arguments to send to the media browse service when connecting and retrieving the root id for browsing, or null if none. The contents of this bundle may affect the information returned when browsing.

See Also

• MediaBrowserServiceCompat.BrowserRoot#EXTRA_RECENTMediaBrowserServiceCompat.BrowserRoot#EXTRA_OFFLINEMediaBrowserServiceCompat.BrowserRoot#EXTRA_SUGGESTED

Public methods

connect

fun connect(): Unit

Connects to the media browse service. Internally, it binds to the service.

The connection callback specified in the constructor will be invoked when the connection completes or fails.

disconnect

fun disconnect(): Unit

Disconnects from the media browse service. After this, no more callbacks will be received.

getExtras

@Nullable fun getExtras(): Bundle?

Gets any extras for the media service.

Return
Bundle?: The extra bundle if it is connected and set, and null otherwise.

Exceptions
IllegalStateException	if not connected.

getItem

fun getItem(@NonNull mediaId: String, @NonNull cb: MediaBrowserCompat.ItemCallback): Unit

Retrieves a specific MediaItem from the connected service. Not all services may support this, so falling back to subscribing to the parent's id should be used when unavailable.

Parameters
mediaId	String: The id of the item to retrieve.
cb	String: The callback to receive the result on.

getRoot

@NonNull fun getRoot(): String

Gets the root id.

Note that the root id may become invalid or change when when the browser is disconnected.

Exceptions
IllegalStateException	if not connected.

getServiceComponent

@NonNull fun getServiceComponent(): ComponentName

Gets the service component that the media browser is connected to.

getSessionToken

@NonNull fun getSessionToken(): MediaSessionCompat.Token

Gets the media session token associated with the media browser.

Note that the session token may become invalid or change when when the browser is disconnected.

Return
MediaSessionCompat.Token: The session token for the browser, never null.

Exceptions
IllegalStateException	if not connected.

isConnected

fun isConnected(): Boolean

Returns whether the browser is connected to the service.

search

fun search(@NonNull query: String, extras: Bundle!, @NonNull callback: MediaBrowserCompat.SearchCallback): Unit

Searches media items from the connected service. Not all services may support this, and SearchCallback#onError will be called if not implemented.

Parameters
query	String: The search query that contains keywords separated by space. Should not be an empty string.
extras	String: The bundle of service-specific arguments to send to the media browser service. The contents of this bundle may affect the search result.
callback	String: The callback to receive the search result. Must be non-null.

Exceptions
IllegalStateException	if the browser is not connected to the media browser service.

sendCustomAction

fun sendCustomAction(@NonNull action: String, extras: Bundle!, @Nullable callback: MediaBrowserCompat.CustomActionCallback?): Unit

Sends a custom action to the connected service. If the service doesn't support the given action, CustomActionCallback#onError will be called.

Parameters
action	String: The custom action that will be sent to the connected service. Should not be an empty string.
extras	String: The bundle of service-specific arguments to send to the media browser service.
callback	String: The callback to receive the result of the custom action.

See Also

• #CUSTOM_ACTION_DOWNLOAD#CUSTOM_ACTION_REMOVE_DOWNLOADED_FILE

subscribe

fun subscribe(@NonNull parentId: String, @NonNull callback: MediaBrowserCompat.SubscriptionCallback): Unit

Queries for information about the media items that are contained within the specified id and subscribes to receive updates when they change.

The list of subscriptions is maintained even when not connected and is restored after the reconnection. It is ok to subscribe while not connected but the results will not be returned until the connection completes.

If the id is already subscribed with a different callback then the new callback will replace the previous one and the child data will be reloaded.

Parameters
parentId	String: The id of the parent media item whose list of children will be subscribed.
callback	String: The callback to receive the list of children.

subscribe

fun subscribe(@NonNull parentId: String, @NonNull options: Bundle, @NonNull callback: MediaBrowserCompat.SubscriptionCallback): Unit

Queries with service-specific arguments for information about the media items that are contained within the specified id and subscribes to receive updates when they change.

The list of subscriptions is maintained even when not connected and is restored after the reconnection. It is ok to subscribe while not connected but the results will not be returned until the connection completes.

If the id is already subscribed with a different callback then the new callback will replace the previous one and the child data will be reloaded.

Parameters
parentId	String: The id of the parent media item whose list of children will be subscribed.
options	String: A bundle of service-specific arguments to send to the media browse service. The contents of this bundle may affect the information returned when browsing.
callback	String: The callback to receive the list of children.

unsubscribe

fun unsubscribe(@NonNull parentId: String): Unit

Unsubscribes for changes to the children of the specified media id.

The query callback will no longer be invoked for results associated with this id once this method returns.

Parameters
parentId	String: The id of the parent media item whose list of children will be unsubscribed.

unsubscribe

fun unsubscribe(@NonNull parentId: String, @NonNull callback: MediaBrowserCompat.SubscriptionCallback): Unit

Unsubscribes for changes to the children of the specified media id.

The query callback will no longer be invoked for results associated with this id once this method returns.

Parameters
parentId	String: The id of the parent media item whose list of children will be unsubscribed.
callback	String: A callback sent to the media browse service to subscribe.