PlaybackSeekDataProvider

Kotlin |Java

open class PlaybackSeekDataProvider

kotlin.Any
↳	androidx.leanback.widget.PlaybackSeekDataProvider

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

Summary

Nested classes
open	`ResultCallback` Client to receive result for `PlaybackSeekDataProvider#getThumbnail(int, * ResultCallback)`.

Public constructors
`<init>()` Class to be implemented by app to provide seeking data and thumbnails to UI.

Public methods
open LongArray!	`getSeekPositions()` Get a list of sorted seek positions.
open Unit	`getThumbnail(index: Int, callback: PlaybackSeekDataProvider.ResultCallback!)` Called to get thumbnail bitmap.
open Unit	`reset()` Called when seek stops, Provider should cancel pending requests for the thumbnails.

Public constructors

<init>

PlaybackSeekDataProvider()

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

Public methods

getSeekPositions

open fun getSeekPositions(): LongArray!

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

Return
`LongArray!`	A list of sorted seek positions.

getThumbnail

open fun getThumbnail(
    index: Int, 
    callback: PlaybackSeekDataProvider.ResultCallback!
): Unit

Called to get thumbnail bitmap. This method is called on UI thread. When provider finds cache bitmap, it may invoke ResultCallback#onThumbnailLoaded(Bitmap, int) immediately. Provider may start background thread and invoke 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 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

open fun reset(): Unit

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