与Apollo有关的MediaProvider_create view audio-优快云博客

本文链接：https://blog.youkuaiyun.com/liu149339750/article/details/22671679

本文介绍了Apollo播放器中播放列表的实现方式，包括默认播放列表的创建、获取用户自定义播放列表的方法以及如何根据播放列表ID获取歌曲列表。

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以下来自Apollo播放器

1.播放列表（audio_playlists）

数据库建View

                db.execSQL("CREATE VIEW audio_playlists AS SELECT _id," + PLAYLIST_COLUMNS +
                        " FROM files WHERE " + FileColumns.MEDIA_TYPE + "="
                        + FileColumns.MEDIA_TYPE_PLAYLIST + ";");

默认添加两项列表：

    /* Adds the favorites and last added playlists */
    private void makeDefaultPlaylists() {
        final Resources resources = getContext().getResources();

        /* Favorites list */
        final Playlist favorites = new Playlist(-1,
                resources.getString(R.string.playlist_favorites));
        mPlaylistList.add(favorites);

        /* Last added list */
        final Playlist lastAdded = new Playlist(-2,
                resources.getString(R.string.playlist_last_added));
        mPlaylistList.add(lastAdded);
    }

得到用户添加的播放列表（比如：我的录音）：

    public static final Cursor makePlaylistCursor(final Context context) {
        return context.getContentResolver().query(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
                new String[] {
                        /* 0 */
                        BaseColumns._ID,
                        /* 1 */
                        PlaylistsColumns.NAME
                }, null, null, MediaStore.Audio.Playlists.DEFAULT_SORT_ORDER);
    }

（1）收藏夹数据取自自己的数据库。

（2）最后添加

    public static final Cursor makeLastAddedCursor(final Context context) {
        final int fourWeeks = 4 * 3600 * 24 * 7;
        final StringBuilder selection = new StringBuilder();
        selection.append(AudioColumns.IS_MUSIC + "=1");
        selection.append(" AND " + AudioColumns.TITLE + " != ''"); //$NON-NLS-2$
        selection.append(" AND " + MediaStore.Audio.Media.DATE_ADDED + ">"); //$NON-NLS-2$
        selection.append(System.currentTimeMillis() / 1000 - fourWeeks);
        return context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                new String[] {
                        /* 0 */
                        BaseColumns._ID,
                        /* 1 */
                        AudioColumns.TITLE,
                        /* 2 */
                        AudioColumns.ARTIST,
                        /* 3 */
                        AudioColumns.ALBUM
                }, selection.toString(), null, MediaStore.Audio.Media.DATE_ADDED + " DESC");
    }

（3）自定义分类

    public static final long[] getSongListForPlaylist(final Context context, final long playlistId) {
        final String[] projection = new String[] {
            MediaStore.Audio.Playlists.Members.AUDIO_ID
        };
        Cursor cursor = context.getContentResolver().query(
                MediaStore.Audio.Playlists.Members.getContentUri("external",
                        Long.valueOf(playlistId)), projection, null, null,
                MediaStore.Audio.Playlists.Members.DEFAULT_SORT_ORDER);

        if (cursor != null) {
            final long[] list = getSongListForCursor(cursor);
            cursor.close();
            cursor = null;
            return list;
        }
        return sEmptyList;
    }