从 Arraylist> 填充 ListView

发布于 2024-12-16 11:47:33 字数 315 浏览 2 评论 0 原文

我有一个 ArrayList>，我想用它填充 ListView。我可以使用什么类型的适配器以及在适配器的 from 字段中放置什么内容？示例如下：

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

希望很清楚。感谢任何帮助。

原文

I have an ArrayList<HashMap<Contact, Name>> and I want to populate a ListView with it. What type of adapter can I use and what do I put in the from field of my adapter? Example below:

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

Hope it is clear. Appreciate any help.

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青春有你 2024-12-23 11:47:33

1.实现 BaseAdapter

我认为最好的选择是扩展 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

1. Implement BaseAdapter

I think your best bet is to extend BaseAdapter and implement the following methods:

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

It would look something like this:

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. Be scrupulous about using the ViewHolder pattern

When implementing getView(), utilizing this design pattern will save a LOT of memory:

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

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