Java Code Examples for android.support.v4.media.session.MediaSessionCompat#QueueItem

@Override
public void updatePlaylist(List<DownloadFile> playlist) {
	List<MediaSessionCompat.QueueItem> queue = new ArrayList<>();

	for(DownloadFile file: playlist) {
		Entry entry = file.getSong();
		Bundle extras = new Bundle();
		extras.putLong(MediaMetadataCompat.METADATA_KEY_DURATION,
				((entry.getDuration() == null) ? 0 : (entry.getDuration() * 1000)));

		MediaDescriptionCompat description = new MediaDescriptionCompat.Builder()
				.setMediaId(entry.getId())
				.setTitle(entry.getTitle())
				.setSubtitle(entry.getArtist())
				.setDescription(entry.getAlbum())
				.setExtras(extras)
				.build();
		MediaSessionCompat.QueueItem item = new MediaSessionCompat.QueueItem(description, entry.getId().hashCode());
		queue.add(item);
	}

	mediaSession.setQueue(queue);
	currentQueue = playlist;
}
 

private static List<MediaSessionCompat.QueueItem> convertToQueue(
        Iterable<MediaMetadataCompat> tracks, String... categories) {
    List<MediaSessionCompat.QueueItem> queue = new ArrayList<>();
    int count = 0;
    for (MediaMetadataCompat track : tracks) {

        // We create a hierarchy-aware mediaID, so we know what the queue is about by looking
        // at the QueueItem media IDs.
        String hierarchyAwareMediaID = MediaIDHelper.createMediaID(
                track.getDescription().getMediaId(), categories);

        MediaMetadataCompat trackCopy = new MediaMetadataCompat.Builder(track)
                .putString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID, hierarchyAwareMediaID)
                .build();

        // We don't expect queues to change after created, so we use the item index as the
        // queueId. Any other number unique in the queue would work.
        MediaSessionCompat.QueueItem item = new MediaSessionCompat.QueueItem(trackCopy.getDescription(), count++);
        queue.add(item);
    }
    return queue;

}
 

/**
 * Create a random queue.
 *
 * @param musicProvider the provider used for fetching music.
 * @return list containing {@link MediaSessionCompat.QueueItem}'s
 */
public static List<MediaSessionCompat.QueueItem> getRandomQueue(MusicProvider musicProvider) {
    List<MediaMetadataCompat> result = new ArrayList<>();

    for (String genre : musicProvider.getGenres()) {
        Iterable<MediaMetadataCompat> tracks = musicProvider.getMusicsByGenre(genre);
        for (MediaMetadataCompat track : tracks) {
            if (ThreadLocalRandom.current().nextBoolean()) {
                result.add(track);
            }
        }
    }
    LogUtils.d(TAG, "getRandomQueue: result.size=", result.size());

    Collections.shuffle(result);

    return convertToQueue(result, MEDIA_ID_MUSICS_BY_SEARCH, "random");
}
 

/**
 * Update the current media player state, optionally showing an error message.
 *
 * @param error if not null, error message to present to the user.
 */
private void updatePlaybackState(String error) {
    LogUtils.d(TAG, "updatePlaybackState, playback state=" + mPlayback.getState());
    long position = PlaybackStateCompat.PLAYBACK_POSITION_UNKNOWN;
    if (mPlayback != null && mPlayback.isConnected()) {
        position = mPlayback.getCurrentStreamPosition();
    }

    PlaybackStateCompat.Builder stateBuilder = new PlaybackStateCompat.Builder()
            .setActions(getAvailableActions());

    setCustomAction(stateBuilder);
    int state = mPlayback.getState();

    // If there is an error message, send it to the playback state:
    if (error != null) {
        // Error states are really only supposed to be used for errors that cause playback to
        // stop unexpectedly and persist until the user takes action to fix it.
        stateBuilder.setErrorMessage(error);
        state = PlaybackStateCompat.STATE_ERROR;
    }
    stateBuilder.setState(state, position, 1.0f, SystemClock.elapsedRealtime());

    // Set the activeQueueItemId if the current index is valid.
    if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
        MediaSessionCompat.QueueItem item = mPlayingQueue.get(mCurrentIndexOnQueue);
        stateBuilder.setActiveQueueItemId(item.getQueueId());
    }

    mSession.setPlaybackState(stateBuilder.build());

    if (state == PlaybackStateCompat.STATE_PLAYING || state == PlaybackStateCompat.STATE_PAUSED) {
        mMediaNotificationManager.startNotification();
    }
}
 

private MediaMetadataCompat getCurrentPlayingMusic() {
    if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
        MediaSessionCompat.QueueItem item = mPlayingQueue.get(mCurrentIndexOnQueue);
        if (item != null) {
            LogUtils.d(TAG, "getCurrentPlayingMusic for musicId=",
                    item.getDescription().getMediaId());
            return mMusicProvider.getMusic(
                    MediaIDHelper.extractMusicIDFromMediaID(item.getDescription().getMediaId()));
        }
    }
    return null;
}
 

@Override
public void onMetadataChanged(String mediaId) {
    LogUtils.d(TAG, "onMetadataChanged", mediaId);
    List<MediaSessionCompat.QueueItem> queue = QueueHelper.getPlayingQueue(mediaId, mMusicProvider);
    int index = QueueHelper.getMusicIndexOnQueue(queue, mediaId);
    if (index > -1) {
        mCurrentIndexOnQueue = index;
        mPlayingQueue = queue;
        updateMetadata();
    }
}
 

public static List<MediaSessionCompat.QueueItem> getPlayingQueue(String mediaId,
                                                                 MusicProvider musicProvider) {

    // extract the browsing hierarchy from the media ID:
    String[] hierarchy = MediaIDHelper.getHierarchy(mediaId);

    if (hierarchy.length != 2) {
        LogUtils.e(TAG, "Could not build a playing queue for this mediaId: ", mediaId);
        return null;
    }

    String categoryType = hierarchy[0];
    String categoryValue = hierarchy[1];
    LogUtils.d(TAG, "Creating playing queue for ", categoryType, ",  ", categoryValue);

    Iterable<MediaMetadataCompat> tracks = null;
    // This sample only supports genre and by_search category types.
    switch (categoryType) {
        case MEDIA_ID_MUSICS_BY_GENRE:
            tracks = musicProvider.getMusicsByGenre(categoryValue);
            break;
        case MEDIA_ID_MUSICS_BY_SEARCH:
            tracks = musicProvider.searchMusicBySongTitle(categoryValue);
            break;
        case MEDIA_ID_MUSICS_BY_ALBUM:
            tracks = musicProvider.getMusicsByAlbum(categoryValue);
            break;
        case MEDIA_ID_MUSICS_BY_ARTIST:
            tracks = musicProvider.getMusicsByArtist(categoryValue);
            break;
    }

    if (tracks == null) {
        LogUtils.e(TAG, "Unrecognized category type: ", categoryType, " for media ", mediaId);
        return null;
    }

    return convertToQueue(tracks, hierarchy[0], hierarchy[1]);
}
 

public static List<MediaSessionCompat.QueueItem> getPlayingQueueFromSearch(String query,
                                                                           Bundle queryParams, MusicProvider musicProvider) {

    LogUtils.d(TAG, "Creating playing queue for musics from search: ", query,
            " params=", queryParams);

    VoiceSearchParams params = new VoiceSearchParams(query, queryParams);

    LogUtils.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<MediaMetadataCompat> 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);
}
 

public static int getMusicIndexOnQueue(Iterable<MediaSessionCompat.QueueItem> queue,
                                       String mediaId) {
    int index = 0;
    for (MediaSessionCompat.QueueItem item : queue) {
        if (mediaId.equals(item.getDescription().getMediaId())) {
            return index;
        }
        index++;
    }
    return -1;
}
 

public static int getMusicIndexOnQueue(Iterable<MediaSessionCompat.QueueItem> queue,
                                       long queueId) {
    int index = 0;
    for (MediaSessionCompat.QueueItem item : queue) {
        if (queueId == item.getQueueId()) {
            return index;
        }
        index++;
    }
    return -1;
}
 

public static boolean isIndexPlayable(int index, List<MediaSessionCompat.QueueItem> queue) {
    return (queue != null && index >= 0 && index < queue.size());
}
 

@Override
public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
    super.onQueueChanged(queue);
    LogUtils.d(TAG, "onQueueChanged");
}
 

@Override
public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
    super.onQueueChanged(queue);
}