在我的应用程序我想设置铃声当我收到来电......如何打开 SD卡并获得的音频文件的，并列出它。如何获得 URI 为选定音频文件 ..

In my app I want to set the ringtone when I get an incoming call... How to open the SDCARD and get audio files and list it.. How to get the URI for the selected audio file..

推荐答案

MediaScanner发现音乐对你来说，填充MediaStore数据库。下面是一些code查找音乐的条目：

MediaScanner finds music for you, populating the MediaStore database. Here's some code to look up a music entry:

final Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    final String[] cursor_cols = {
            MediaStore.Audio.Media._ID,
            MediaStore.Audio.Media.ARTIST,
            MediaStore.Audio.Media.ALBUM,
            MediaStore.Audio.Media.TITLE,
    };
    final String where = MediaStore.Audio.Media.IS_MUSIC + "=1";
    final Cursor cursor = getContentResolver().query(uri, cursor_cols, where, null, null);
    cursor.moveToNext();
    final String artist = cursor.getString(_cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
    final String album = cursor.getString(_cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));
    final String track = cursor.getString(_cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));
    doSomethingHere(artist, album, track);

数据字段中包含的句柄可以用的MediaPlayer使用。而这样做的媒体文件的扫描和索引的第一次，扫描，使用的AsyncTask，但后来当使用一个服务都收到一个意图。

The "data" field contains a handle you can use with MediaPlayer. while doing this media files scanning and indexing for the first time, scan it using a AsyncTask, but later when a intent is received do it using a service.