MediaRouteProvider

public abstract class MediaRouteProvider
extends Object

java.lang.Object
   ↳ androidx.mediarouter.media.MediaRouteProvider

Media route providers are used to publish additional media routes for use within an application. Media route providers may also be declared as a service to publish additional media routes to all applications in the system.

The purpose of a media route provider is to discover media routes that satisfy the criteria specified by the current MediaRouteDiscoveryRequest and publish a MediaRouteProviderDescriptor with information about each route by calling setDescriptor(MediaRouteProviderDescriptor) to notify the currently registered MediaRouteProvider.Callback.

The provider should watch for changes to the discovery request by implementing onDiscoveryRequestChanged(MediaRouteDiscoveryRequest) and updating the set of routes that it is attempting to discover. It should also handle route control requests such as volume changes or media control intents by implementing onCreateRouteController(String) to return a MediaRouteProvider.RouteController for a particular route.

A media route provider can support dynamic group that allows the user to add or remove a route from the selected route dynamically. To control dynamic group, MediaRouteProvider.DynamicGroupRouteController returned by onCreateDynamicGroupRouteController(String) is used instead of MediaRouteProvider.RouteController.

A media route provider may be used privately within the scope of a single application process by calling MediaRouter.addProvider to add it to the local MediaRouter. A media route provider may also be made available globally to all applications by registering a MediaRouteProviderService in the provider's manifest. When the media route provider is registered as a service, all applications that use the media router API will be able to discover and used the provider's routes without having to install anything else.

This object must only be accessed on the main thread.

Summary

Nested classes

class MediaRouteProvider.Callback

Callback which is invoked when route information becomes available or changes. 

class MediaRouteProvider.DynamicGroupRouteController

Provides control over a dynamic group route. 

class MediaRouteProvider.ProviderMetadata

Describes properties of the route provider's implementation. 

class MediaRouteProvider.RouteController

Provides control over a particular route. 

Public constructors

MediaRouteProvider(Context context)

Creates a media route provider.

Public methods

final Context getContext()

Gets the context of the media route provider.

final MediaRouteProviderDescriptor getDescriptor()

Gets the provider's descriptor.

final MediaRouteDiscoveryRequest getDiscoveryRequest()

Gets the current discovery request which informs the provider about the kinds of routes to discover and whether to perform active scanning.

final Handler getHandler()

Gets the provider's handler which is associated with the main thread.

final MediaRouteProvider.ProviderMetadata getMetadata()

Gets some metadata about the provider's implementation.

MediaRouteProvider.DynamicGroupRouteController onCreateDynamicGroupRouteController(String initialMemberRouteId)

Creates a MediaRouteProvider.DynamicGroupRouteController.

MediaRouteProvider.RouteController onCreateRouteController(String routeId)

Called by the media router to obtain a route controller for a particular route.

void onDiscoveryRequestChanged(MediaRouteDiscoveryRequest request)

Called by the media router when the discovery request has changed.

final void setCallback(MediaRouteProvider.Callback callback)

Sets a callback to invoke when the provider's descriptor changes.

final void setDescriptor(MediaRouteProviderDescriptor descriptor)

Sets the provider's descriptor.

final void setDiscoveryRequest(MediaRouteDiscoveryRequest request)

Sets a discovery request to inform the provider about the kinds of routes that its clients would like to discover and whether to perform active scanning.

Inherited methods

Public constructors

MediaRouteProvider

public MediaRouteProvider (Context context)

Creates a media route provider.

Parameters
context Context: The context.

Public methods

getContext

public final Context getContext ()

Gets the context of the media route provider.

Returns
Context

getDescriptor

public final MediaRouteProviderDescriptor getDescriptor ()

Gets the provider's descriptor.

The descriptor describes the state of the media route provider and the routes that it publishes. Watch for changes to the descriptor by registering a callback with setCallback(MediaRouteProvider.Callback).

Returns
MediaRouteProviderDescriptor The media route provider descriptor, or null if none.

getDiscoveryRequest

public final MediaRouteDiscoveryRequest getDiscoveryRequest ()

Gets the current discovery request which informs the provider about the kinds of routes to discover and whether to perform active scanning.

Returns
MediaRouteDiscoveryRequest The current discovery request, or null if no discovery is needed at this time.

getHandler

public final Handler getHandler ()

Gets the provider's handler which is associated with the main thread.

Returns
Handler

getMetadata

public final MediaRouteProvider.ProviderMetadata getMetadata ()

Gets some metadata about the provider's implementation.

Returns
MediaRouteProvider.ProviderMetadata

onCreateDynamicGroupRouteController

public MediaRouteProvider.DynamicGroupRouteController onCreateDynamicGroupRouteController (String initialMemberRouteId)

Creates a MediaRouteProvider.DynamicGroupRouteController.

It will be called from an app or MediaRouter when a single route or a single static group is selected.

Parameters
initialMemberRouteId String: initially selected route's id.
Returns
MediaRouteProvider.DynamicGroupRouteController MediaRouteProvider.DynamicGroupRouteController. Returns null if there is no such route or if the route cannot be controlled using the MediaRouteProvider.DynamicGroupRouteController interface.

onCreateRouteController

public MediaRouteProvider.RouteController onCreateRouteController (String routeId)

Called by the media router to obtain a route controller for a particular route.

The media router will invoke the MediaRouteProvider.RouteController.onRelease() method of the route controller when it is no longer needed to allow it to free its resources.

Parameters
routeId String: The unique id of the route.
Returns
MediaRouteProvider.RouteController The route controller. Returns null if there is no such route or if the route cannot be controlled using the route controller interface.

onDiscoveryRequestChanged

public void onDiscoveryRequestChanged (MediaRouteDiscoveryRequest request)

Called by the media router when the discovery request has changed.

Whenever an applications calls MediaRouter.addCallback(MediaRouteSelector, MediaRouter.Callback) to register a callback, it also provides a selector to specify the kinds of routes that it is interested in. The media router combines all of these selectors together to generate a MediaRouteDiscoveryRequest and notifies each provider when a change occurs by calling setDiscoveryRequest(MediaRouteDiscoveryRequest) which posts a message to invoke this method asynchronously.

The provider should examine the media control categories in the discovery request's selector to determine what kinds of routes it should try to discover and whether it should perform active or passive scans. In many cases, the provider may be able to save power by determining that the selector does not contain any categories that it supports and it can therefore avoid performing any scans at all.

Parameters
request MediaRouteDiscoveryRequest: The new discovery request, or null if no discovery is needed at this time.

setCallback

public final void setCallback (MediaRouteProvider.Callback callback)

Sets a callback to invoke when the provider's descriptor changes.

Parameters
callback MediaRouteProvider.Callback: The callback to use, or null if none.

setDescriptor

public final void setDescriptor (MediaRouteProviderDescriptor descriptor)

Sets the provider's descriptor.

The provider must call this method to notify the currently registered callback about the change to the provider's descriptor.

Parameters
descriptor MediaRouteProviderDescriptor: The updated route provider descriptor, or null if none.

setDiscoveryRequest

public final void setDiscoveryRequest (MediaRouteDiscoveryRequest request)

Sets a discovery request to inform the provider about the kinds of routes that its clients would like to discover and whether to perform active scanning.

Parameters
request MediaRouteDiscoveryRequest: The discovery request, or null if no discovery is needed at this time.