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今天搞了一天，用getcontentresolver().query()l来获取音乐列表，却啥也没有，是不是需要什么权限啊，代码如下，请大神帮帮忙啊。

package com.example.musictest;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.MediaStore;

import android.view.Menu;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.TextView;

import android.util.Log;

public class MainActivity extends Activity {

private ListView list1;

private List mMusicList = new ArrayList();

private TextView view1;

private TextView view2;

private String title;

Context context;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

view1 = (TextView)findViewById(R.id.textView1);

view2 = (TextView)findViewById(R.id.textView2);

list1 = (ListView) findViewById(R.id.listView1);

makelist();

}

private void makelist() {

try{

String[] musicInfo = new String[]{MediaStore.Audio.Media.TITLE,

MediaStore.Audio.Media.DURATION,

MediaStore.Audio.Media.ARTIST,

MediaStore.Audio.Media._ID,

MediaStore.Audio.Media.DATA};

Cursor cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,null);

view1.setText(cursor.getCount());

cursor.moveToFirst();

for (int i = 0; i < cursor.getCount(); i++) {

title = cursor.getString(cursor

.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));

mMusicList.add(title);

cursor.moveToNext();

}

view2.setText(title);

ArrayAdapter musicList = new ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1, mMusicList);

list1.setAdapter(musicList);

}catch(Exception e){

Log.v("错了","");

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}