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PlaybackSeekDataProvider

public class PlaybackSeekDataProvider
extends Object

java.lang.Object
   ↳ androidx.leanback.widget.PlaybackSeekDataProvider

Class to be implemented by app to provide seeking data and thumbnails to UI.

Summary

Nested classes

class PlaybackSeekDataProvider.ResultCallback

Client to receive result for PlaybackSeekDataProvider.getThumbnail(int, ResultCallback). 

Public constructors

PlaybackSeekDataProvider()

Public methods

long[] getSeekPositions()

Get a list of sorted seek positions.

void getThumbnail(int index, PlaybackSeekDataProvider.ResultCallback callback)

Called to get thumbnail bitmap.

void reset()

Called when seek stops, Provider should cancel pending requests for the thumbnails.

Inherited methods

Public constructors

PlaybackSeekDataProvider

public PlaybackSeekDataProvider ()

Public methods

getSeekPositions

public long[] getSeekPositions ()

Get a list of sorted seek positions. The positions should not change after user starts seeking.

Returns
long[] A list of sorted seek positions.

getThumbnail

public void getThumbnail (int index, 
                PlaybackSeekDataProvider.ResultCallback callback)

Called to get thumbnail bitmap. This method is called on UI thread. When provider finds cache bitmap, it may invoke PlaybackSeekDataProvider.ResultCallback.onThumbnailLoaded(Bitmap, int) immediately. Provider may start background thread and invoke PlaybackSeekDataProvider.ResultCallback.onThumbnailLoaded(Bitmap, int) later in UI thread. The method might be called multiple times for the same position, PlaybackSeekDataProvider must guarantee to replace pending PlaybackSeekDataProvider.ResultCallback with the new one. When seeking right, getThumbnail() will be called with increasing index; when seeking left, getThumbnail() will be called with decreasing index. The increment of index can be used by subclass to determine prefetch direction.

Parameters
index int: Index of position in getSeekPositions().
callback PlaybackSeekDataProvider.ResultCallback: The callback to receive the result on UI thread. It may be called within getThumbnail() if hit cache directly.

reset

public void reset ()

Called when seek stops, Provider should cancel pending requests for the thumbnails.