从sd卡读取音乐文件问题

[liuyou6046]

package com.example.util;

import java.util.ArrayList;
import java.util.List;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.provider.MediaStore;

import com.example.domain.Music;



public class MusicList {

public static List<Music> getMusicData(Context context) {
List<Music> musicList = new ArrayList<Music>();
ContentResolver cr = context.getContentResolver();
if (cr != null) {
// 获取所有歌曲

Cursor cursor = cr.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null,
null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
if (null == cursor) {
return null;
}
if (cursor.moveToFirst()) {
do {
Music m = new Music();
String title = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.TITLE));
String singer = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST));
if ("<unknown>".equals(singer)) {
singer = "未知艺术家";
}
String album = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM));
long size = cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media.SIZE));
long time = cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media.DURATION));
String url = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA));
String name = cursor
.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
String sbr = name.substring(name.length() - 3,
name.length());
//Log.e("--------------", sbr);
if (sbr.equals("mp3")) {
m.setTitle(title);
m.setSinger(singer);
m.setAlbum(album);
m.setSize(size);
m.setTime(time);
m.setUrl(url);
m.setName(name);
musicList.add(m);
}
} while (cursor.moveToNext());
}
}
return musicList;

}
}
可以从sd卡读取完整MP3文件 但是if (sbr.equals("mp3"))改成if (sbr.equals("mid"))后

[咿呀咿呦喂]

请问请教一下，从sd卡读去文件时为什么程序会闪退呢？

[xbr19921010]

报什么错??