Android-ListView(展示条目)

public class MainActivity extends Activity {
  private ListView listView;
  private PersonService personService;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        personService=new PersonService(this); 
        listView=(ListView)this.findViewById(R.id.listView);      
        show();      
    }

  private void show3() {//自定义适配器
    List<Person> persons=personService.getScrollData(0,20);
    PersonAdapter adapter=new PersonAdapter(this,persons,R.layout.item); 
    listView.setAdapter(adapter);

}

  private void show2() {
      // TODO Auto-generated method stub
      Cursor cursor=personService.getCursorData(0, 20);//这个适配器一定要将查询处理的别名改为    _id
      SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,R.layout.item,
      cursor,new String[]{"name","phone","amount"},new int[]{R.id.name,R.id.phone,R.id.amount});
      listView.setAdapter(adapter);  
  }

  private void show(){
     List<Person> persons=personService.getScrollData(0,20);
     List<HashMap<String,Object>> data=new ArrayList<HashMap<String,Object>>();
     for(Person person:persons){
      HashMap<String,Object> item=new HashMap<String,Object>();
      item.put("name",person.getName());  
      item.put("phone",person.getPhone());
      item.put("amount",person.getAmount());
      item.put("id",person.getId());     
      data.add(item);
     }
     SimpleAdapter adapter=new SimpleAdapter(this,data,R.layout.item,new String[]{"name","phone","amount"},new int[]{R.id.name,R.id.phone,R.id.amount});
     listView.setAdapter(adapter);    
    }
}

public class PersonAdapter extends BaseAdapter {
 private List<Person> persons;// 要绑定的数据
 private int resource;// 绑定的条目界面
 private LayoutInflater inflater;// 布局填充服务
 public PersonAdapter(Context context, List<Person> persons, int resource) {
  inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);//取得布局填充服务
  this.persons = persons;
  this.resource = resource;
 }
 public int getCount() {//  条目的数量

  return persons.size();
 }

 public Object getItem(int position) {//得到条目的数据

   return persons.get(position);
 }

 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 }

 public View getView(int position, View convertView,ViewGroup parent) {

  TextView nameView=null;
  TextView phoneView=null;
  TextView amountView=null;
  if(convertView==null){//

   convertView=inflater.inflate(resource,null);//生成的条目对象   
   nameView=(TextView)convertView.findViewById(R.id.name);
   phoneView=(TextView)convertView.findViewById(R.id.phone);
   amountView=(TextView)convertView.findViewById(R.id.amount);
   ViewCache cache=new ViewCache();
   cache.nameView=nameView;
   cache.phoneView=phoneView;
   cache.amountView=amountView;
   convertView.setTag(cache);
   
  }else{
   ViewCache cache=(ViewCache)convertView.getTag();
   nameView=cache.nameView;
   phoneView=cache.phoneView;
   amountView=cache.amountView;   
  }
  
  Person person=persons.get(position);
  //??????????????
  nameView.setText(person.getName());
  phoneView.setText(person.getPhone());
  amountView.setText(person.getAmount().toString());
  return convertView;
  
 }
 private final class ViewCache{
  public TextView nameView;
  public TextView phoneView;
  public TextView amountView;
 }
}