/**
* Actual implementation of onLoadChildren that assumes that MusicProvider is already initialized.
*/
private void loadChildrenImpl(
final String parentMediaId, final Result<List<MediaBrowser.MediaItem>> result) {
LogHelper.d(TAG, "OnLoadChildren: parentMediaId=", parentMediaId);
List<MediaBrowser.MediaItem> mediaItems = new ArrayList<>();
if (MEDIA_ID_ROOT.equals(parentMediaId)) {
LogHelper.d(TAG, "OnLoadChildren.ROOT");
mediaItems.add(
new MediaBrowser.MediaItem(
new MediaDescription.Builder()
.setMediaId(MEDIA_ID_MUSICS_BY_GENRE)
.setTitle(getString(R.string.browse_genres))
.setIconUri(
Uri.parse(
"android.resource://" + "com.example.android.uamp/drawable/ic_by_genre"))
.setSubtitle(getString(R.string.browse_genre_subtitle))
.build(),
MediaBrowser.MediaItem.FLAG_BROWSABLE));
} else if (MEDIA_ID_MUSICS_BY_GENRE.equals(parentMediaId)) {
LogHelper.d(TAG, "OnLoadChildren.GENRES");
for (String genre : mMusicProvider.getGenres()) {
MediaBrowser.MediaItem item =
new MediaBrowser.MediaItem(
new MediaDescription.Builder()
.setMediaId(createBrowseCategoryMediaID(MEDIA_ID_MUSICS_BY_GENRE, genre))
.setTitle(genre)
.setSubtitle(getString(R.string.browse_musics_by_genre_subtitle, genre))
.build(),
MediaBrowser.MediaItem.FLAG_BROWSABLE);
mediaItems.add(item);
}
} else if (parentMediaId.startsWith(MEDIA_ID_MUSICS_BY_GENRE)) {
String genre = MediaIDHelper.getHierarchy(parentMediaId)[1];
LogHelper.d(TAG, "OnLoadChildren.SONGS_BY_GENRE genre=", genre);
for (MediaMetadata track : mMusicProvider.getMusicsByGenre(genre)) {
// Since mediaMetadata fields are immutable, we need to create a copy, so we
// can set a hierarchy-aware mediaID. We will need to know the media hierarchy
// when we get a onPlayFromMusicID call, so we can create the proper queue based
// on where the music was selected from (by artist, by genre, random, etc)
String hierarchyAwareMediaID =
MediaIDHelper.createMediaID(
track.getDescription().getMediaId(), MEDIA_ID_MUSICS_BY_GENRE, genre);
MediaMetadata trackCopy =
new MediaMetadata.Builder(track)
.putString(MediaMetadata.METADATA_KEY_MEDIA_ID, hierarchyAwareMediaID)
.build();
MediaBrowser.MediaItem bItem =
new MediaBrowser.MediaItem(trackCopy.getDescription(), MediaItem.FLAG_PLAYABLE);
mediaItems.add(bItem);
}
} else {
LogHelper.w(TAG, "Skipping unmatched parentMediaId: ", parentMediaId);
}
LogHelper.d(TAG, "OnLoadChildren sending ", mediaItems.size(), " results for ", parentMediaId);
result.sendResult(mediaItems);
}
/**
* Create a random queue.
*
* @param musicProvider the provider used for fetching music.
* @return list containing {@link MediaSession.QueueItem}'s
*/
public static List<MediaSession.QueueItem> getRandomQueue(MusicProvider musicProvider) {
List<MediaMetadata> result = new ArrayList<>();
for (String genre : musicProvider.getGenres()) {
Iterable<MediaMetadata> tracks = musicProvider.getMusicsByGenre(genre);
for (MediaMetadata track : tracks) {
if (ThreadLocalRandom.current().nextBoolean()) {
result.add(track);
}
}
}
LogHelper.d(TAG, "getRandomQueue: result.size=", result.size());
Collections.shuffle(result);
return convertToQueue(result, MEDIA_ID_MUSICS_BY_SEARCH, "random");
}
