Android 创建播放列表

Question

有人知道如何用代码向 Android 添加播放列表吗？

我知道我必须将其插入到内容解析器中，但是我是否必须只将歌曲 ID 放入其中，还是必须将歌曲的所有数据放入其中？

我一直在寻找示例代码，但尚未找到。

编辑： 在这里找到了答案，我是这样做的：

  public static void addToPlaylist(ContentResolver resolver, int audioId) {

        String[] cols = new String[] {
                "count(*)"
        };
        Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", YOUR_PLAYLIST_ID);
        Cursor cur = resolver.query(uri, cols, null, null, null);
        cur.moveToFirst();
        final int base = cur.getInt(0);
        cur.close();
        ContentValues values = new ContentValues();
        values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, Integer.valueOf(base + audioId));
        values.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, audioId);
        resolver.insert(uri, values);
    }

   public static void removeFromPlaylist(ContentResolver resolver, int audioId) {
       Log.v("made it to add",""+audioId);
        String[] cols = new String[] {
                "count(*)"
        };
        Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", YOUR_PLAYLIST_ID);
        Cursor cur = resolver.query(uri, cols, null, null, null);
        cur.moveToFirst();
        final int base = cur.getInt(0);
        cur.close();
        ContentValues values = new ContentValues();

        resolver.delete(uri, MediaStore.Audio.Playlists.Members.AUDIO_ID +" = "+audioId, null);
    }

Answer 1

为了解决“未回答”的问题，我将OP的代码粘贴在这里：

 public static void addToPlaylist(ContentResolver resolver, int audioId) {

        String[] cols = new String[] {
                "count(*)"
        };
        Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", YOUR_PLAYLIST_ID);
        Cursor cur = resolver.query(uri, cols, null, null, null);
        cur.moveToFirst();
        final int base = cur.getInt(0);
        cur.close();
        ContentValues values = new ContentValues();
        values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, Integer.valueOf(base + audioId));
        values.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, audioId);
        resolver.insert(uri, values);
    }

   public static void removeFromPlaylist(ContentResolver resolver, int audioId) {
       Log.v("made it to add",""+audioId);
        String[] cols = new String[] {
                "count(*)"
        };
        Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", YOUR_PLAYLIST_ID);
        Cursor cur = resolver.query(uri, cols, null, null, null);
        cur.moveToFirst();
        final int base = cur.getInt(0);
        cur.close();
        ContentValues values = new ContentValues();

        resolver.delete(uri, MediaStore.Audio.Playlists.Members.AUDIO_ID +" = "+audioId, null);
    }

Answer 2

为了回答 Jaroslav Záruba 的评论，代码最好使用添加的曲目集的 PLAY_ORDER，如下所示：

cur.moveToLast();
final int base = cur.getInt(cur.getColumnIndex(Playlists.Members.PLAY_ORDER));
cur.close();
ContentValues values = new ContentValues();
values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, 
      Integer.valueOf(base + 1));

有两个主要变化：我们使用播放列表的最后一个元素 (cur.moveToLast())，并将 1 添加到其 PLAY_ORDER 值来确定新曲目的 PLAY_ORDER。重点是播放列表中要有连续的曲目。

例如，您还可以添加 10 个，以便可以在新曲目之前或之后插入曲目。
我还改变了获取曲目 ID 的方式。事实上，我们不希望出现获取错误数据的任何问题，因此我们指定了所需的列。

Answer 3

这是从播放列表中删除歌曲的更正代码：

public static void removeFromPlaylist(ContentResolver resolver, int audioId) 
{
Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", YOUR_PLAYLIST_ID);
resolver.delete(uri, MediaStore.Audio.Playlists.Members._ID +" = "+audioId, null);
}

Answer 4

使用这个代码本身是不言自明的。它将把给定的 id = SongID 的歌曲添加到名为 playlistName 的播放列表中。

如果播放列表已存在，它将添加到现有播放列表，或者创建新的播放列表，然后将歌曲添加到其中

 /**
     * This function add song with id songID to playlist playlistName
     * if playlist does exist it will add to exiixting one or it will create new
     *
     * @param playlistName
     * @param songID
     */
    private void addToPlaylist(String playlistName, int songID) {

        //Vibrate device
        Utils.vibrate(getApplicationContext());

        //get all playlists
        Cursor playListCursor = AppController.getGlobalContentResolvere().query(
                MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, new String[]{"*"}, null, null,
                null);

        long playlistId = 0;

        playListCursor.moveToFirst();

        do {

            //check if selected playlsit already exist
            if (playListCursor.getString(playListCursor
                    .getColumnIndex(MediaStore.Audio.Playlists.NAME)).
                    equalsIgnoreCase(playlistName)) {

                playlistId = playListCursor.getLong(playListCursor
                        .getColumnIndex(MediaStore.Audio.Playlists._ID));
                break;
            }
        } while (playListCursor.moveToNext());

        //Playlist  doesnt exist creating new with given name
        if (playlistId == 0) {

            Log.d(TAG, "CREATING PLAYLIST: " + playlistName);

            ContentValues playlisrContentValue = new ContentValues();

            //Add name
            playlisrContentValue.put(MediaStore.Audio.Playlists.NAME, playlistName);

            //update modified value
            playlisrContentValue.put(MediaStore.Audio.Playlists.DATE_MODIFIED,
                    System.currentTimeMillis());

            Uri playlistURl = AppController.getGlobalContentResolvere().insert(
                    MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, playlisrContentValue);

            Log.d(TAG, "Added PlayLIst: " + playlistURl);

        } else {

            //Playlist alreay exist add to playlist
            String[] cols = new String[]{
                    "count(*)"
            };

            Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId);

            Cursor favListCursor = AppController.getGlobalContentResolvere().query(uri, cols, null, null, null);

            favListCursor.moveToFirst();

            final int base = favListCursor.getInt(0);

            //playlist updated delete older playlist art so that we can create new
            Toast.makeText(AudioPlayerActivity.this, "deleted old file" + new File(AppContants.PLAY_LIST_DIR + playlistId + ".png").delete(), Toast.LENGTH_SHORT).show();

            favListCursor.close();

            //add song to last
            ContentValues values = new ContentValues();

            values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, base + songID);

            values.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, songID);

            AppController.getGlobalContentResolvere().insert(uri, values);


            //Debug purpose
            Toast.makeText(AudioPlayerActivity.this, "Added to Favourite list " +
                            CenterRepository.getInstance().getAudioCollection().getSongAt(AppConfig.SONG_NUMBER).getTitle()
                    , Toast.LENGTH_SHORT).show();

        }
    }