//設(shè)置鈴聲
    public static void setRingtone(File rt, Context context) {
        
        
        if (rt != null && context != null && rt.exists()) {
            //先掃描文件, 添加到媒體庫中
            scanForMedia(rt, context);
            //再從媒體庫中,搜索該文件, 修改添加到鈴聲列表
            Cursor c = context.getContentResolver().query(
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, 
                    "_data = ?", new String[]{rt.getAbsolutePath()}, null);
            
            if (c.getCount() > 0) {
                c.moveToFirst();
                int id = c.getInt(0);
                //添加到鈴聲列表
                ContentValues values = new ContentValues();
                values.put(MediaStore.Audio.Media.IS_RINGTONE, true);
                context.getContentResolver().update(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 
                        values, "_id = ?", new String[] {id + ""});
                
                //得到該鈴聲的Uri
                Uri ringtone = Uri.withAppendedPath(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id + "");
                
                //設(shè)置為默認(rèn)鈴聲
                RingtoneManager.setActualDefaultRingtoneUri(
                context,
                RingtoneManager.TYPE_RINGTONE,
                ringtone
                );
            }
            c.close();
        }
    }
}