Android中 自定义数据绑定适配器BaseAdapter的方法
代码如下:
public class PersonAdapter extends BaseAdapter {
private List persons;// 要绑定的数据
private int resource;// 绑定的一个条目界面的id，此例中即为item.xml
private LayoutInflater inflater;// 布局填充器，它可以使用一个xml文件生成一个View对象，可以通过Context获取实例对象
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;
}
}
