我有一个ArrayList<HashMap<Contact, Name>>,我想用它填充ListView。我可以使用哪种类型的适配器?我应该在适配器的from字段中输入什么?下面的例子:

String[] from = ?
int[] to = new int[] { R.id.contact, R.id.name});
adapter = new KindOfAdapter(this, R.layout.row, from, to)


希望清楚。感谢任何帮助。

最佳答案

1.实现BaseAdapter

我认为您最好的选择是扩展BaseAdapter并实现以下方法:

getCount()
getItem(int)
getItemId(int)
getView(int, View, ViewGroup)


它看起来像这样:

public class MyAdapter extends BaseAdapter() {
   private List<Map<Contact, Name>> map;
   private Context context;

   public MyAdapter(List<Map<Contact, Name>> map>, Context context) {
      this.map = map;
      this.context = context;
   }

   public int getCount() {
      return map.size(); // or do you want one list item per name?
      // if so, just count out all the map entries in each item of the list
   }

   public int getItemId(int position) {
      return position; // doesn't matter too much...
   }

   public View getView(int position, View convertView, ViewGroup parent) {
      // populate the view here...
      // use LayoutInflater.from(context).inflate(resource, parent, false) to inflate new views
   }
}


2.谨慎使用ViewHolder模式

在实现getView()时,利用此设计模式将节省大量内存:

http://www.screaming-penguin.com/node/7767

07-24 09:32