读取本地音乐
private void ShowMp3List() {
??Cursor cursor = this.getContentResolver().query(
????MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,//音频的uri
????new String[] { MediaStore.Audio.Media.TITLE,??? //歌曲名称
??????MediaStore.Audio.Media.DURATION,??? //歌曲持续的时间
??????MediaStore.Audio.Media.ARTIST,?????? //歌手
??????MediaStore.Audio.Media._ID,???????????? //歌曲id
??????MediaStore.Audio.Media.DISPLAY_NAME,
??????MediaStore.Audio.Media.DATA,?????? //歌曲文件路径
??????MediaStore.Audio.Media.ALBUM_ID }, null, null, null);
?
??if (null != cursor && cursor.getCount() == 0) {
???builder = new AlertDialog.Builder(this);
???builder.setMessage(R.string.music_list_tell).setPositiveButton(
?????"aa", null);
???ad = builder.create();
???ad.show();
???listviews.setBackgroundResource(R.drawable.list_empty);
???return;
??}
??cursor.moveToFirst();//验证游标是否为空
??
?
??while(cursor.moveToNext){
???id = cursor.getInt(3);
???title= cursor.getString(0);
???artist = cursor.getString(2);
???path = cursor.getString(5).substring(4);
???alltime=(toTime(cursor.getInt(1)));
System.out.println(id+""+title+artist+path+alltime)
????}
? listview.setAdapter(new SimpleCursorAdapter(this, R.layout.item_listview, cursor, new String[]{MediaStore.Audio.Media._ID
??????????????? ,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.TITLE}, new int[]{R.id.imageView1,R.id.textView1,R.id.textView2}));
?}
/////////////////////////////////////////////////////////
MediaStore类是Android平台的多媒体数据库，它包含了音频，视频，图片等所有多媒体文件信息
media? 是媒体的意思
MediaStore以ContentProvider的形式向外提供媒体数据库信息。通过Android平台提供的ContentProvider接口，可以方便的访问数据库信息。
MediaStore.Audio.Media类定义了媒体数据库中的歌曲信息
???? 歌曲ID：MediaStore.Audio.Media._ID
???? 歌曲的名称 ：MediaStore.Audio.Media.TITLE
???? MediaStore.Audio.Artists类定义了媒体数据库中的歌手信息
???? MediaStore.Audio.Albums类定义了媒体数据库中的专辑信息
???? MediaStore.Audio.Playlists类定义了媒体数据库中的播放列表信息
???? 歌曲文件的路径 ：MediaStore.Audio.Media.DATA
???? 歌曲的总播放时长 ：MediaStore.Audio.Media.DURATION
???? 歌曲文件的大小 ：MediaStore.Audio.Media.SIZE
???? MediaStore.Audio.Media.DISPLAY_NAME???? 歌曲id 歌首 歌名（1 周杰伦-爱的怒放.mp3）
???? audio?? adj. 听觉的，声音的；音频的
?
?
//fragment碎片
package com.wuxifu.musiclist;
import com.example.tabhost002.R;
import com.wuxifu.widget.MyPlayer;
import com.wuxifu.widget.MyService.MyBinder;
import android.database.Cursor;
import android.os.Binder;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
public class SearchaLocalMusicFragment extends ListFragment
{
??? private Button search;
??? @Override
??? public View onCreateView(LayoutInflater inflater, ViewGroup container,
??????????? Bundle savedInstanceState)
??? {
??????? View inflate = inflater.inflate(R.layout.local_music, null);
??????? search =(Button) inflate.findViewById(R.id.search);
??????? iniSearch();
??????? return inflate;
??? }
??? private void iniSearch()
??? {
???????
??? }
??? private MyPlayer myPlayer;
??? private MyBinder binder;
??? @Override
??? public void onActivityCreated(Bundle savedInstanceState)
??? {
??????? super.onActivityCreated(savedInstanceState);
??????? String[] projection=new String[] { MediaStore.Audio.Media.TITLE,
??????????????? MediaStore.Audio.Media.DURATION,
??????????????? MediaStore.Audio.Media.ARTIST,
??????????????? MediaStore.Audio.Media._ID,
??????????????? MediaStore.Audio.Media.DISPLAY_NAME,
??????????????? MediaStore.Audio.Media.DATA,
??????????????? MediaStore.Audio.Media.ALBUM_ID };
??????? final Cursor cursor = getActivity().getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);
??????? if(!cursor.moveToFirst())
??????? {
??????????? Log.e("cursor", "cursor为空 ");
??????????? return ;
??????? }
?????? setListAdapter(new MusicListAdapter(getActivity(), cursor));
?????? getListView().setOnItemClickListener(new OnItemClickListener()
??? {
??????
??????? @Override
??????? public void onItemClick(AdapterView<?> parent, View view, int position,
??????????????? long id)
??????? {
??????????? if(myPlayer==null || binder==null){
??????????? myPlayer = (MyPlayer)getActivity().getSupportFragmentManager().findFragmentById(R.id.fragment1);
??????????? binder = myPlayer.getmBinder();
??????????? }
??????????? //先要让cursor移动要那一行，才能取那一行某列的数据，否则不行的
?????????? if( cursor.moveToPosition(position)){
??????????? String string=cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
??????????? binder.play(string);
?????????? }
??????????? }
??? });
??? }
}
///////////////////////////////
Cursor android.content.ContentResolver.query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
如?? select id,name,age? from? wuxifu? where? id in (15,20)?? order by age;
?String[] projection=new String[]{"id","name","age"}
//错的：：：：String selection=new String[]{"id"}
//正确的：：：：：
String selection=“id? in? (?,?)? ”;
String selectionArgs=new String[]{"110","20"};
?
?
