public List<Music> getmusics( Context context){    List<Music> musiclist=new ArrayList<Music>();//定义一个music类型的列表　　//定义一个游标，用来遍历音乐文件    Cursor cursor=context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);    if(cursor.moveToFirst()){        while(!cursor.isAfterLast()){            Music music=new Music();            int music_id=cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));//音乐的ID            int album_id=cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID));//专辑的ID            String album=cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));//专辑名称            String title=cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));//歌曲名称            String artist=cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));//歌手            double time=cursor.getDouble(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION))/60000;　　　　　　//音乐的播放时长，由于单位是毫秒所以除了60000，但暂时还没有以分：秒 形式显示出来            String url=cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));//音乐文件的路径            String title_artist=title+"--"+artist;            int isMusic=cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.IS_MUSIC));            if(isMusic!=0){                music.setMusic_id(music_id);                music.setAlbum_id(album_id);                music.setAlbum(album);                music.setTitle(title);                music.setArtist(artist);                music.setTime(time);                music.setUrl(url);                music.setTitle_artist(title_artist);                musiclist.add(music);            }            cursor.moveToNext();        }    }    return musiclist;}//设置数据适配器

SimpleAdapter adapter=new SimpleAdapter(getApplicationContext(),musiclist,R.layout.music_list,new String[]{"title_artist","album"},new int[]{R.id.title_artist,R.id.album});lv.setAdapter(adapter);//绑定数据适配器

//为lv这个list设置监听器，并重写onItemClick方法，点击Item可以播放音乐

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {                play(mp3list.get(i).getUrl(),mediaplay);//mp3list.get(i).getURl(),是你点击的Item对应音乐的文件路径，play是自己定义的一个播放音乐的方法            }        });

播放，暂停，上一首，下一首

ImageButton.OnClickListener listener = new ImageButton.OnClickListener() {    public void onClick(View v) {        switch (v.getId()) {            case R.id.bt_last:　　　　　　　　//上一首                if (current_music > 0) {                    current_music = current_music - 1;                    mediaplay.reset();                    play(mp3list.get(current_music).getUrl(), mediaplay);                    isrelease = false;                    start.setImageDrawable(getResources().getDrawable(R.drawable.paste));                    if(mp3list.size()!=0){                        music_name.setText(mp3list.get(current_music).getTitle());                        artist_name.setText("-- "+mp3list.get(current_music).getArtist()+" --");                        total_time.setText(mp3list.get(current_music).getFormatTime());                        progressbar.setMax(mp3list.get(current_music).getTime());                   }                }else{                    current_music = mp3list.size()-1;                    mediaplay.reset();                    play(mp3list.get(current_music).getUrl(), mediaplay);                    isrelease = false;                    start.setImageDrawable(getResources().getDrawable(R.drawable.paste));                    if(mp3list.size()!=0){                        music_name.setText(mp3list.get(current_music).getTitle());                        artist_name.setText("-- "+mp3list.get(current_music).getArtist()+" --");                        total_time.setText(mp3list.get(current_music).getFormatTime());                        progressbar.setMax(mp3list.get(current_music).getTime());                    }                }                break;　　　　　　　　//播放，暂停            case R.id.bt_start:                if(isrelease){                    mediaplay.reset();                    play(mp3list.get(current_music).getUrl(), mediaplay);                    isrelease=false;                }                if(!mediaplay.isPlaying()){                    mediaplay.start();                    ((ImageButton)v).setImageDrawable(getResources().getDrawable(R.drawable.paste));                }else {                    mediaplay.pause();                    ((ImageButton) v).setImageDrawable(getResources().getDrawable(R.drawable.start));                }                break;　　　　　　　　//下一首            case R.id.bt_next:                if (current_music < mp3list.size()-1) {                    current_music = current_music + 1;                    mediaplay.reset();                    play(mp3list.get(current_music).getUrl(), mediaplay);                    start.setImageDrawable(getResources().getDrawable(R.drawable.paste));                    isrelease=false;                    if(mp3list.size()!=0){                        music_name.setText(mp3list.get(current_music).getTitle());                        artist_name.setText("-- "+mp3list.get(current_music).getArtist()+" --");                        total_time.setText(mp3list.get(current_music).getFormatTime());                        progressbar.setMax(mp3list.get(current_music).getTime());                    }                }else{                    current_music = 0;                    mediaplay.reset();                    play(mp3list.get(current_music).getUrl(), mediaplay);                    start.setImageDrawable(getResources().getDrawable(R.drawable.paste));                    isrelease=false;                    if(mp3list.size()!=0){                        music_name.setText(mp3list.get(current_music).getTitle());                        artist_name.setText("-- "+mp3list.get(current_music).getArtist()+" --");                        total_time.setText(mp3list.get(current_music).getFormatTime());                        progressbar.setMax(mp3list.get(current_music).getTime());                    }                }                break;