Java 类android.provider.MediaStore.Audio.Artists 实例源码

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    String[] projection = new String[] {
            BaseColumns._ID, MediaColumns.TITLE, AudioColumns.ALBUM, AudioColumns.ARTIST
    };
    StringBuilder where = new StringBuilder();
    String sortOrder = Audio.Media.DEFAULT_SORT_ORDER;
    where.append(AudioColumns.IS_MUSIC + "=1").append(" AND " + MediaColumns.TITLE + " != ''");
    Uri uri = Audio.Media.EXTERNAL_CONTENT_URI;
    if (getArguments() != null) {
        mPlaylistId = getArguments().getLong(BaseColumns._ID);
        String mimeType = getArguments().getString(MIME_TYPE);
        if (Audio.Playlists.CONTENT_TYPE.equals(mimeType)) {
            where = new StringBuilder();
            where.append(AudioColumns.IS_MUSIC + "=1");
            where.append(" AND " + MediaColumns.TITLE + " != ''");
            switch ((int)mPlaylistId) {
                case (int)PLAYLIST_QUEUE:
                    uri = Audio.Media.EXTERNAL_CONTENT_URI;
                    long[] mNowPlaying = MusicUtils.getQueue();
                    if (mNowPlaying.length == 0)
                        return null;
                    where = new StringBuilder();
                    where.append(BaseColumns._ID + " IN (");
                    if (mNowPlaying == null || mNowPlaying.length <= 0)
                        return null;
                    for (long queue_id : mNowPlaying) {
                        where.append(queue_id + ",");
                    }
                    where.deleteCharAt(where.length() - 1);
                    where.append(")");
                    break;
                case (int)PLAYLIST_FAVORITES:
                    long favorites_id = MusicUtils.getFavoritesId(getActivity());
                    projection = new String[] {
                            Playlists.Members._ID, Playlists.Members.AUDIO_ID,
                            MediaColumns.TITLE, AudioColumns.ALBUM, AudioColumns.ARTIST
                    };
                    uri = Playlists.Members.getContentUri(EXTERNAL, favorites_id);
                    sortOrder = Playlists.Members.DEFAULT_SORT_ORDER;
                    break;
                default:
                    if (id < 0)
                        return null;
                    projection = new String[] {
                            Playlists.Members._ID, Playlists.Members.AUDIO_ID,
                            MediaColumns.TITLE, AudioColumns.ALBUM, AudioColumns.ARTIST,
                            AudioColumns.DURATION
                    };

                    uri = Playlists.Members.getContentUri(EXTERNAL, mPlaylistId);
                    sortOrder = Playlists.Members.DEFAULT_SORT_ORDER;
                    break;
            }
        } else if (Audio.Genres.CONTENT_TYPE.equals(mimeType)) {
            long genreId = getArguments().getLong(BaseColumns._ID);
            uri = Genres.Members.getContentUri(EXTERNAL, genreId);
            projection = new String[] {
                    BaseColumns._ID, MediaColumns.TITLE, AudioColumns.ALBUM,
                    AudioColumns.ARTIST
            };
            where = new StringBuilder();
            where.append(AudioColumns.IS_MUSIC + "=1").append(
                    " AND " + MediaColumns.TITLE + " != ''");
            sortOrder = Genres.Members.DEFAULT_SORT_ORDER;
        } else {
            if (Audio.Albums.CONTENT_TYPE.equals(mimeType)) {
                long albumId = getArguments().getLong(BaseColumns._ID);
                where.append(" AND " + AudioColumns.ALBUM_ID + "=" + albumId);
                sortOrder = Audio.Media.TRACK + ", " + sortOrder;
            } else if (Audio.Artists.CONTENT_TYPE.equals(mimeType)) {
                sortOrder = MediaColumns.TITLE;
                long artist_id = getArguments().getLong(BaseColumns._ID);
                where.append(" AND " + AudioColumns.ARTIST_ID + "=" + artist_id);
            }
        }
    }
    return new CursorLoader(getActivity(), uri, projection, where.toString(), null, sortOrder);
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    // Check for database errors
    if (data == null) {
        return;
    }

    if (getArguments() != null
            && Playlists.CONTENT_TYPE.equals(getArguments().getString(MIME_TYPE))
            && (getArguments().getLong(BaseColumns._ID) >= 0 || getArguments().getLong(
                    BaseColumns._ID) == PLAYLIST_FAVORITES)) {
        mMediaIdIndex = data.getColumnIndexOrThrow(Playlists.Members.AUDIO_ID);
        mTitleIndex = data.getColumnIndexOrThrow(MediaColumns.TITLE);
        mAlbumIndex = data.getColumnIndexOrThrow(AudioColumns.ALBUM);
        // FIXME
        // mArtistIndex =
        // data.getColumnIndexOrThrow(Playlists.Members.ARTIST);
    } else if (getArguments() != null
            && Genres.CONTENT_TYPE.equals(getArguments().getString(MIME_TYPE))) {
        mMediaIdIndex = data.getColumnIndexOrThrow(BaseColumns._ID);
        mTitleIndex = data.getColumnIndexOrThrow(MediaColumns.TITLE);
        mArtistIndex = data.getColumnIndexOrThrow(AudioColumns.ARTIST);
        mAlbumIndex = data.getColumnIndexOrThrow(AudioColumns.ALBUM);
    } else if (getArguments() != null
            && Artists.CONTENT_TYPE.equals(getArguments().getString(MIME_TYPE))) {
        mTitleIndex = data.getColumnIndexOrThrow(MediaColumns.TITLE);
        // mArtistIndex is "line2" of the ListView
        mArtistIndex = data.getColumnIndexOrThrow(AudioColumns.ALBUM);
    } else if (getArguments() != null
            && Albums.CONTENT_TYPE.equals(getArguments().getString(MIME_TYPE))) {
        mMediaIdIndex = data.getColumnIndexOrThrow(BaseColumns._ID);
        mTitleIndex = data.getColumnIndexOrThrow(MediaColumns.TITLE);
        mArtistIndex = data.getColumnIndexOrThrow(AudioColumns.ARTIST);
    } else {
        mMediaIdIndex = data.getColumnIndexOrThrow(BaseColumns._ID);
        mTitleIndex = data.getColumnIndexOrThrow(MediaColumns.TITLE);
        mArtistIndex = data.getColumnIndexOrThrow(AudioColumns.ARTIST);
        mAlbumIndex = data.getColumnIndexOrThrow(AudioColumns.ALBUM);
    }
    mTrackAdapter.changeCursor(data);
    mListView.invalidateViews();
    mCursor = data;
}