Android创建播放列表

Question

任何人都知道如何将代码中的播放列表添加到Android？

我得到的是我不得不将它插入到内容解析器中，但是我必须将歌曲ID插入还是必须将所有歌曲的数据放入？

我一直在寻找示例代码，但还没有找到。

编辑： 发现这里的答案是我如何做到这一点：

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

要退出“不回答”这个问题我已经贴了OP的代码在这里：

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

要回答JaroslavZáruba评论说，代码更好的PLAY_ORDER增加的轨道集如下：

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)); 

改变了两件大事：我们使用播放列表的最后一个元素（cur.moveToLast（）），并且我们给它的PLAY_ORDER值加1以确定新音乐的PLAY_ORDER。重点是在播放列表中有连续的曲目。

您还可以添加10个例子，以便您可以在新曲目之前或之后插入曲目。 我也改变了我们获得曲目ID的方式。事实上，我们不想有任何问题获取错误的数据，所以我们指定我们想要的列。

Answer 3

这是纠正其从播放列表中删除歌曲代码：

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

使用此代码本身是自我解释。这将增加首歌给定id = songID与名playlistName

到播放列表播放列表如果已经存在，将添加到现有的或将创造新的，然后添加歌曲到它

/** 
    * 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(); 

     } 
    }