ListView的数据显示，三种适配器绑定方式

public void OnCreate(){...listView=(ListView)findViewById(R.id.listview);//点击条目的事件listView.setOnItemClickListener(listener);show3();}//点击条目的事件private final class ItemClickListener implements OnItemClickListener{public void OnItemClick(AdapterView<?>parent,View view,int position,long id){ListView lv=(ListView)parent;//Person p=(Person)lv.getItemAtPosition(position);//调用自定义适配器，返回PersonCursor cursor=(Cursor)lv.getItemAtPosition(position);//SimpleCursorAdapter适配器Toast.makeText(getApplicationContext(),p.Name,1).show();}}//SimpleAdapter适配器private void show(){List<Person> persons=...;List<HashMap<String,Object>> data=new ArrayList<HashMap<String,Object>>();for(Person p : persons){HashMap<String,Object> item=new HashMap<String,Object>();item.put("name",p.Name);item.put("phone",p.Phone);data.add(item);}SimpleAdapter adapter=new SimpleAdapter(this,data,R.layout.viewitem,new String[]{"name","phone"},new int[]{R.id.name,R.id.phone});listview.setAdapter(adapter);/*int total=adapter.getCount();int perpage=7;for(int i=0;i<perpage;i++){View view=adapter.getView(i,convertView,parent);}*/}//SimpleCursorAdapter适配器private void show2(){SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,R.layout.viewitem,Cursor 对象,new String[]{"name","phone"},new int[]{R.id.name,R.id.phone});listview.setAdapter(adapter)}//自定义适配器private void show3(){List<Person> persons=...PersonAdapter adapter=new PersonAdapter(this,persons,R.layout.viewitem);listView.setAdapter(adapter);}自定义适配器public class PersonAdapter extends BaseAdapter{privte List<Person> persons;//要绑定的数据private int resource;//绑定的条目的界面LayoutInflater inflater;//布局填充器。生成所对应的view对象，系统内置public PersonAdapter(Context context,List<Person> persons,int resource){this.persons=persons;this.resource=resource;//取得系统内置的布局填充器inflater=context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)}public int getCount(){//得到要显示数据的总数return persons.size();}public Object getItem(int position){//取得索引位置的值return persons.get(position);}public long getItemId(int position){//取得索引号return position;}public View getView(int position,View convertView,ViewGroup parent){TextView name=null;TextView phone=null;//取得条目的界面if(convertView==null){//第一页.不为null则重用它。不然每一次都生成一个view对象，则损耗性能inflater.inflate(resource,null);//生成条目界面对象 name=convertView.findViewById(R.id.name); phone=convertView.findViewById(R.id.phone);ViewCache cache=new ViewCache();cache.nameView=name;cache.phoneView=phone;convertView.setTag(cache);//标志，把缓存放进去。取得标志就可以取得缓存对象}else{//不用去查找，重用以前生成的viewViewCache cache=(ViewCache)convertView.getTag();name=cache.nameView;phone=cache.phoneView;}Person person=persons.get(position);//数据绑定name.setText(person.Name);phone.setText(person.Phone);return converView;}//性能优化：//每显示一个条目，都会调用getView方法，如果每次都去查找显示控件，那影响性能//定义一个内部类，用来缓存视图private final class ViewCache{public TextView nameView;//get，set更耗内存public TextView phoneView;}}

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