如何添加一些文件到播放列表

Question

我创建一个使用下一个方法新的播放列表：

ContentResolver resolver = getContentResolver(); 
ContentValues value = new ContentValues(); 
value.put(MediaStore.Audio.Playlists.NAME, "Name PlayList"); 
value.put(MediaStore.Audio.Playlists.DATE_MODIFIED, System.currentTimeMillis()); 
resolver.insert(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, value); 

我的mp3文件列表（ArrayList<File>）。

如何将这些文件添加到新播放列表中？

Answer 1

在我来说，我只有文件的列表，所以起初我需要使用文件路径来获得音频ID：

public static long getTrackIdByPath(Context context, String pathToFile){ 
long id = - 1; 
String[] projection = {MediaStore.Audio.Media._ID, 
         MediaStore.Audio.Media.DATA}; 
String selection = MediaStore.Audio.Media.DATA + " like ?"; 
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 
     projection, selection, 
     new String[] {pathToFile}, null); 
cursor.moveToFirst(); 
if(cursor.getCount() > 0) 
    id = cursor.getLong(0); 
cursor.close(); 
return id; 

在那之后，我可以添加音频到播放列表：

ContentResolver resolver = getContentResolver(); 
long trackId = getTrackIdByPath(context, pathToFile); 
    Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playListId); 
    Cursor cursor = resolver.query(uri, new String[] {"count(*)"}, null, null, null); 
    cursor.moveToFirst(); 
    int last = cursor.getInt(0); 
    cursor.close(); 
    ContentValues value = new ContentValues(); 
     value.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, ++last); 
     value.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, trackId); 

    resolver.insert(uri, value);