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PlaybackGlue

abstract class PlaybackGlue
kotlin.Any
   ↳ androidx.leanback.media.PlaybackGlue

Base class for abstraction of media play/pause feature. A subclass of PlaybackGlue will contain implementation of Media Player or a connection to playback Service. App initializes PlaybackGlue subclass, associated it with a PlaybackGlueHost. PlaybackGlueHost is typically implemented by a Fragment or an Activity, it provides the environment to render UI for PlaybackGlue object, it optionally provides SurfaceHolder via SurfaceHolderGlueHost to render video. A typical PlaybackGlue should release resources (e.g. MediaPlayer or connection to playback Service) in onDetachedFromHost(). onDetachedFromHost() is called in two cases:

In rare case if an PlaybackGlue wants to live outside fragment / activity life cycle, it may manages resource release by itself.

Summary

Nested classes
abstract

Interface to allow clients to take action once the video is ready to play and start stop.

Public constructors
<init>(context: Context!)

Constructor.

Public methods
open Unit

Add a PlayerCallback.
open Context!

Returns the context.
open PlaybackGlueHost!

open Boolean

Returns true if media is currently playing.
open Boolean

Returns true when the media player is prepared to start media playback.
open Unit

Goes to the next media item.
open Unit

Pauses the media player.
open Unit

Starts the media player.
open Unit

Starts play when isPrepared() becomes true.
open Unit

Goes to the previous media item.
open Unit

Remove a PlayerCallback.
Unit

This method is used to associate a PlaybackGlue with the PlaybackGlueHost which provides UI and optional SurfaceHolderGlueHost.

Protected methods
open MutableList<PlaybackGlue.PlayerCallback!>!

open Unit

This method is called attached to associated PlaybackGlueHost.
open Unit

This method is called when current associated PlaybackGlueHost is attached to a different PlaybackGlue or PlaybackGlueHost is destroyed .
open Unit

This method is called when PlaybackGlueHost is paused.
open Unit

This method is called when PlaybackGlueHost is resumed.
open Unit

This method is called when PlaybackGlueHost is started.
open Unit

This method is called when PlaybackGlueHost is stopped.

Public constructors

<init>

PlaybackGlue(context: Context!)

Constructor.

Public methods

addPlayerCallback

open fun addPlayerCallback(playerCallback: PlaybackGlue.PlayerCallback!): Unit

Add a PlayerCallback.

Parameters
playerCallback PlaybackGlue.PlayerCallback!: The callback to add.

getContext

open fun getContext(): Context!

Returns the context.

getHost

open fun getHost(): PlaybackGlueHost!
Return
PlaybackGlueHost!: Associated PlaybackGlueHost or null if not attached to host.

isPlaying

open fun isPlaying(): Boolean

Returns true if media is currently playing.

isPrepared

open fun isPrepared(): Boolean

Returns true when the media player is prepared to start media playback. When returning false, app may listen to PlayerCallback#onPreparedStateChanged(PlaybackGlue) event.

Return
Boolean: True if prepared, false otherwise.

next

open fun next(): Unit

Goes to the next media item. This method is optional.

pause

open fun pause(): Unit

Pauses the media player.

play

open fun play(): Unit

Starts the media player. Does nothing if isPrepared() is false. To wait isPrepared() to be true before playing, use playWhenPrepared().

playWhenPrepared

open fun playWhenPrepared(): Unit

Starts play when isPrepared() becomes true.

previous

open fun previous(): Unit

Goes to the previous media item. This method is optional.

removePlayerCallback

open fun removePlayerCallback(callback: PlaybackGlue.PlayerCallback!): Unit

Remove a PlayerCallback.

Parameters
callback PlaybackGlue.PlayerCallback!: The callback to remove.

setHost

fun setHost(host: PlaybackGlueHost!): Unit

This method is used to associate a PlaybackGlue with the PlaybackGlueHost which provides UI and optional SurfaceHolderGlueHost.

Parameters
host PlaybackGlueHost!: The host for the PlaybackGlue. Set to null to detach from the host.

Protected methods

getPlayerCallbacks

protected open fun getPlayerCallbacks(): MutableList<PlaybackGlue.PlayerCallback!>!
Return
MutableList<PlaybackGlue.PlayerCallback!>!: A snapshot of list of PlayerCallbacks set on the Glue.

onAttachedToHost

@CallSuper protected open fun onAttachedToHost(host: PlaybackGlueHost!): Unit

This method is called attached to associated PlaybackGlueHost. Subclass may override and call super.onAttachedToHost().

onDetachedFromHost

@CallSuper protected open fun onDetachedFromHost(): Unit

This method is called when current associated PlaybackGlueHost is attached to a different PlaybackGlue or PlaybackGlueHost is destroyed . Subclass may override and call super.onDetachedFromHost() at last. A typical PlaybackGlue will release resources (e.g. MediaPlayer or connection to playback service) in this method.

onHostPause

protected open fun onHostPause(): Unit

This method is called when PlaybackGlueHost is paused. Subclass may override.

onHostResume

protected open fun onHostResume(): Unit

This method is called when PlaybackGlueHost is resumed. Subclass may override.

onHostStart

protected open fun onHostStart(): Unit

This method is called when PlaybackGlueHost is started. Subclass may override.

onHostStop

protected open fun onHostStop(): Unit

This method is called when PlaybackGlueHost is stopped. Subclass may override.