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public personadapter(context context, list persons, int resource) {
inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);
this.resource = resource;
this.persons = persons;
}
@override
public int getcount() {// 得到要绑定的数据总数
return persons.size();
}
@override
public object getitem(int position) {// 给定索引值,得到索引值对应的对象
return persons.get(position);
}
@override
public long getitemid(int position) {// 获取条目id
return position;
}
// listview有缓存功能,当显示第一页页面时会创建页面对象,显示第二页时重用第一页创建好了的对象
// 取得条目界面:position代表当前条目所要绑定的数据在集合中的索引值
@override
public view getview(int position, view convertview, viewgroup parent) {
textview nameview = null;
textview phoneview = null;
textview amountview = null;
if (convertview == null) {// 显示第一页的时候convertview为空
convertview = inflater.inflate(resource, null);// 生成条目对象
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.amountview = amountview;
cache.nameview = nameview;
cache.phoneview = phoneview;
convertview.settag(cache);
} else {
viewcache cache = (viewcache) convertview.gettag();
amountview = cache.amountview;
nameview = cache.nameview;
phoneview = cache.phoneview;
}
person person = persons.get(position);
// 实现数据绑定
nameview.settext(person.getname());
phoneview.settext(person.getphone());
amountview.settext(person.getamount());
return convertview;
}
private final class viewcache {
public textview nameview;
public textview phoneview;
public textview amountview;
}
}
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