listView 结合 ArrayList和HashMap 的应用

 

music_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="1dip"
    android:paddingBottom="1dip">
    
   <TextView 
       
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/mp3_item"
       />
    <TextView android:id="@+id/mp3_name"
    android:layout_height="30dip"
    android:layout_width="fill_parent"
    android:textSize="10pt"
    android:paddingLeft="10dp"
    android:textColor="#FFFFFF"/>
</LinearLayout>

列表

/**
         * 文件过滤器
         * 
         * @author 
         * 
         */
        class MusicFilter implements FilenameFilter {

            @Override
            public boolean accept(File dir, String filename) {

                return (filename.endsWith(".mp3"));
            }

        }
        
        //绑定音乐
        void musicList(){
            try{
                musiclist.clear();
                //扫描SD卡下MP3文件夹中的Mp3歌曲，将扫描出的MP3对象存放到集合中
                File mp3File=new File(SkyMusicActivity.SDPath);
                if(mp3File.listFiles(new MusicFilter()).length>=0){
                       for(File file:mp3File.listFiles(new MusicFilter())){
                            Mp3 mp3=new Mp3();
                            String[] str=file.getName().split("\\.");
                            mp3.setMp3_name(str[0]);
                            mp3.setId(i);
                            i++;
                            musiclist.add(mp3);
                        }
                    }
            }
            catch(Exception ex)
            {
                ex.printStackTrace();
            }
        }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        HashMap<String, String> map=null;
        List<HashMap<String, String>> list=new ArrayList<HashMap<String,String>>();
   
        if(musiclist.size()!=0){
            for(Mp3 m:musiclist){
                map=new HashMap<String, String>();
                map.put("mp3_item", Integer.toString(m.getId()+1));
                map.put("mp3_name", m.getMp3_name());
                list.add(map);
            }
            SimpleAdapter adapter=new SimpleAdapter
                    (this, list, R.layout.music_item,  new String[]{"mp3_item","mp3_name"}, new int[]{R.id.mp3_item,R.id.mp3_name});
            setListAdapter(adapter); 
        }
    }

实现后的界面