@Override
public void onLoadChildren(
@NonNull final String parentMediaId, @NonNull final Result<List<MediaItem>> result) {
if (!mMusicProvider.isInitialized()) {
// Use result.detach to allow calling result.sendResult from another thread:
result.detach();
mMusicProvider.retrieveMediaAsync(
new MusicProvider.Callback() {
@Override
public void onMusicCatalogReady(boolean success) {
if (success) {
loadChildrenImpl(parentMediaId, result);
} else {
updatePlaybackState(getString(R.string.error_no_metadata));
result.sendResult(Collections.<MediaItem>emptyList());
}
}
});
} else {
// If our music catalog is already loaded/cached, load them into result immediately
loadChildrenImpl(parentMediaId, result);
}
}
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");
}
private void setCustomAction(PlaybackState.Builder stateBuilder) {
MediaMetadata currentMusic = getCurrentPlayingMusic();
if (currentMusic != null) {
// Set appropriate "Favorite" icon on Custom action:
String musicId = currentMusic.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
int favoriteIcon = R.drawable.ic_star_off;
if (mMusicProvider.isFavorite(musicId)) {
favoriteIcon = R.drawable.ic_star_on;
}
LogHelper.d(
TAG,
"updatePlaybackState, setting Favorite custom action of music ",
musicId,
" current favorite=",
mMusicProvider.isFavorite(musicId));
stateBuilder.addCustomAction(
CUSTOM_ACTION_THUMBS_UP, getString(R.string.favorite), favoriteIcon);
}
}
private MediaMetadata getCurrentPlayingMusic() {
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
MediaSession.QueueItem item = mPlayingQueue.get(mCurrentIndexOnQueue);
if (item != null) {
LogHelper.d(TAG, "getCurrentPlayingMusic for musicId=", item.getDescription().getMediaId());
return mMusicProvider.getMusic(
MediaIDHelper.extractMusicIDFromMediaID(item.getDescription().getMediaId()));
}
}
return null;
}
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);
}
private void setCustomAction(PlaybackStateCompat.Builder stateBuilder) {
MediaMetadataCompat currentMusic = getCurrentPlayingMusic();
if (currentMusic != null) {
// Set appropriate "Favorite" icon on Custom action:
String musicId = currentMusic.getString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID);
int favoriteIcon = R.drawable.ic_star_off;
if (mMusicProvider.isFavorite(musicId)) {
favoriteIcon = R.drawable.ic_star_on;
}
LogHelper.d(
TAG,
"updatePlaybackState, setting Favorite custom action of music ",
musicId,
" current favorite=",
mMusicProvider.isFavorite(musicId));
Bundle customActionExtras = new Bundle();
WearHelper.setShowCustomActionOnWear(customActionExtras, true);
stateBuilder.addCustomAction(
new PlaybackStateCompat.CustomAction.Builder(
CUSTOM_ACTION_THUMBS_UP, getString(R.string.favorite), favoriteIcon)
.setExtras(customActionExtras)
.build());
}
}
private void updateMetadata() {
if (!QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
LogHelper.e(TAG, "Can't retrieve current metadata.");
updatePlaybackState(getResources().getString(R.string.error_no_metadata));
return;
}
MediaSession.QueueItem queueItem = mPlayingQueue.get(mCurrentIndexOnQueue);
String musicId =
MediaIDHelper.extractMusicIDFromMediaID(queueItem.getDescription().getMediaId());
MediaMetadata track = mMusicProvider.getMusic(musicId);
final String trackId = track.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
if (!musicId.equals(trackId)) {
IllegalStateException e = new IllegalStateException("track ID should match musicId.");
LogHelper.e(
TAG,
"track ID should match musicId.",
" musicId=",
musicId,
" trackId=",
trackId,
" mediaId from queueItem=",
queueItem.getDescription().getMediaId(),
" title from queueItem=",
queueItem.getDescription().getTitle(),
" mediaId from track=",
track.getDescription().getMediaId(),
" title from track=",
track.getDescription().getTitle(),
" source.hashcode from track=",
track.getString(MusicProvider.CUSTOM_METADATA_TRACK_SOURCE).hashCode(),
e);
throw e;
}
LogHelper.d(TAG, "Updating metadata for MusicID= " + musicId);
mSession.setMetadata(track);
// Set the proper album artwork on the media session, so it can be shown in the
// locked screen and in other places.
if (track.getDescription().getIconBitmap() == null
&& track.getDescription().getIconUri() != null) {
String albumUri = track.getDescription().getIconUri().toString();
AlbumArtCache.getInstance()
.fetch(
albumUri,
new AlbumArtCache.FetchListener() {
@Override
public void onFetched(String artUrl, Bitmap bitmap, Bitmap icon) {
MediaSession.QueueItem queueItem = mPlayingQueue.get(mCurrentIndexOnQueue);
MediaMetadata track = mMusicProvider.getMusic(trackId);
track =
new MediaMetadata.Builder(track)
// set high resolution bitmap in METADATA_KEY_ALBUM_ART. This is used, for
// example, on the lockscreen background when the media session is active.
.putBitmap(MediaMetadata.METADATA_KEY_ALBUM_ART, bitmap)
// set small version of the album art in the DISPLAY_ICON. This is used on
// the MediaDescription and thus it should be small to be serialized if
// necessary..
.putBitmap(MediaMetadata.METADATA_KEY_DISPLAY_ICON, icon)
.build();
MediaDescription md;
mMusicProvider.updateMusic(trackId, track);
// If we are still playing the same music
String currentPlayingId =
MediaIDHelper.extractMusicIDFromMediaID(
queueItem.getDescription().getMediaId());
if (trackId.equals(currentPlayingId)) {
mSession.setMetadata(track);
}
}
});
}
}