如何从Android中的MediaStore.Audio.Playlists中删除播放列表

Question

如果可能,我如何以MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI编程方式删除播放列表？

Answer 1

我使用以下代码删除特定的播放列表.它所需要的只是播放列表ID

private void deletePlaylist(String selectedplaylist) 
{
// // Log.i(TAG, "deletePlaylist");
String playlistid = getPlayListId(selectedplaylist);
ContentResolver resolver = this.getContentResolver();
String where = MediaStore.Audio.Playlists._ID + "=?";
String[] whereVal = {playlistid}; 
resolver.delete(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, where, whereVal);
Toast toast = Toast.makeText(this,selectedplaylist + " Deleted", Toast.LENGTH_SHORT);
    toast.show();   
return ;        
}

我创建了一个小应用程序,您可以在其中看到这一点. https://play.google.com/store/apps/details?id=rapc.flyingdutchman.com&feature=nav_result#?t=W251bGwsMSwyLDNd

正如你所看到的,它首先得到了playlistid.此时我所拥有的只是播放列表名称.在我的代码下面获取id.

    public String getPlayListId(String playlist )

    {

    //  read this record and get playlistid

    Uri newuri =MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI;

    final String playlistid = MediaStore.Audio.Playlists._ID;

    final String playlistname = MediaStore.Audio.Playlists.NAME;

    String where = MediaStore.Audio.Playlists.NAME + "=?";

    String[] whereVal = {playlist}; 

    String[] projection = {playlistid, playlistname};

    ContentResolver resolver = getContentResolver();

    Cursor record = resolver.query(newuri , projection, where, whereVal, null);

    int recordcount = record.getCount();

    String foundplaylistid = "";

    if (recordcount > 0)

    {
    record.moveToFirst();

    int idColumn = record.getColumnIndex(playlistid);

    foundplaylistid = record.getString(idColumn);

    record.close();
    }

    return foundplaylistid;
    }