public static List<MediaSession.QueueItem> getPlayingQueue(
String mediaId, MusicProvider musicProvider) {
// extract the browsing hierarchy from the media ID:
String[] hierarchy = MediaIDHelper.getHierarchy(mediaId);
if (hierarchy.length != 2) {
LogHelper.e(TAG, "Could not build a playing queue for this mediaId: ", mediaId);
return null;
}
String categoryType = hierarchy[0];
String categoryValue = hierarchy[1];
LogHelper.d(TAG, "Creating playing queue for ", categoryType, ", ", categoryValue);
Iterable<MediaMetadata> tracks = null;
// This sample only supports genre and by_search category types.
if (categoryType.equals(MEDIA_ID_MUSICS_BY_GENRE)) {
tracks = musicProvider.getMusicsByGenre(categoryValue);
} else if (categoryType.equals(MEDIA_ID_MUSICS_BY_SEARCH)) {
tracks = musicProvider.searchMusicBySongTitle(categoryValue);
}
if (tracks == null) {
LogHelper.e(TAG, "Unrecognized category type: ", categoryType, " for media ", mediaId);
return null;
}
return convertToQueue(tracks, hierarchy[0], hierarchy[1]);
}
/**
* 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");
}
public static List<MediaSession.QueueItem> getPlayingQueueFromSearch(
String query, Bundle queryParams, MusicProvider musicProvider) {
LogHelper.d(
TAG, "Creating playing queue for musics from search: ", query, " params=", queryParams);
VoiceSearchParams params = new VoiceSearchParams(query, queryParams);
LogHelper.d(TAG, "VoiceSearchParams: ", params);
if (params.isAny) {
// If isAny is true, we will play anything. This is app-dependent, and can be,
// for example, favorite playlists, "I'm feeling lucky", most recent, etc.
return getRandomQueue(musicProvider);
}
Iterable<MediaMetadata> result = null;
if (params.isAlbumFocus) {
result = musicProvider.searchMusicByAlbum(params.album);
} else if (params.isGenreFocus) {
result = musicProvider.getMusicsByGenre(params.genre);
} else if (params.isArtistFocus) {
result = musicProvider.searchMusicByArtist(params.artist);
} else if (params.isSongFocus) {
result = musicProvider.searchMusicBySongTitle(params.song);
}
// If there was no results using media focus parameter, we do an unstructured query.
// This is useful when the user is searching for something that looks like an artist
// to Google, for example, but is not. For example, a user searching for Madonna on
// a PodCast application wouldn't get results if we only looked at the
// Artist (podcast author). Then, we can instead do an unstructured search.
if (params.isUnstructured || result == null || !result.iterator().hasNext()) {
// To keep it simple for this example, we do unstructured searches on the
// song title only. A real world application could search on other fields as well.
result = musicProvider.searchMusicBySongTitle(query);
}
return convertToQueue(result, MEDIA_ID_MUSICS_BY_SEARCH, query);
}