public abstract class DownloadHelper extends Object
| Modifier and Type | Class and Description |
|---|---|
static interface |
DownloadHelper.Callback
A callback to be notified when the
DownloadHelper is prepared. |
| Constructor and Description |
|---|
DownloadHelper() |
| Modifier and Type | Method and Description |
|---|---|
abstract DownloadAction |
getDownloadAction(byte[] data,
List<TrackKey> trackKeys)
Builds a
DownloadAction for downloading the specified tracks. |
abstract int |
getPeriodCount()
Returns the number of periods for which media is available.
|
abstract DownloadAction |
getRemoveAction(byte[] data)
Builds a
DownloadAction for removing the media. |
abstract TrackGroupArray |
getTrackGroups(int periodIndex)
Returns the track groups for the given period.
|
void |
prepare(DownloadHelper.Callback callback)
Initializes the helper for starting a download.
|
protected abstract void |
prepareInternal()
Called on a background thread during preparation.
|
public void prepare(DownloadHelper.Callback callback)
callback - A callback to be notified when preparation completes or fails. The callback
will be invoked on the calling thread unless that thread does not have an associated Looper, in which case it will be called on the application's main thread.protected abstract void prepareInternal()
throws IOException
IOException - If preparation fails.public abstract int getPeriodCount()
public abstract TrackGroupArray getTrackGroups(int periodIndex)
periodIndex - The period index.TrackGroupArray.EMPTY for single stream
content.public abstract DownloadAction getDownloadAction(@Nullable byte[] data, List<TrackKey> trackKeys)
DownloadAction for downloading the specified tracks. Must not be called until
after preparation completes.data - Application provided data to store in DownloadAction.data.trackKeys - The selected tracks. If empty, all streams will be downloaded.DownloadAction.public abstract DownloadAction getRemoveAction(@Nullable byte[] data)
DownloadAction for removing the media. May be called in any state.data - Application provided data to store in DownloadAction.data.DownloadAction.