Android的 - 在simpleApapter列表视图如何diplay图片

问题描述

我想显示在列表视图SimpleAdapter德的照片。我包括毕加索在我的项目，但我不知道如何使用毕加索与SimpleAdapter。

I'm trying to display te pictures in a SimpleAdapter listview. I included Picasso in my project but i don't know how to use Picasso with a SimpleAdapter.

List<HashMap<String, String>> featured = new ArrayList<HashMap<String, String>>();

            for (int i=0;i<ids.length;i++){
                HashMap<String, String> hm = new HashMap<String, String>();
                hm.put("productname", names[i]);
                hm.put("productprice", prices[i]);
                hm.put("productimage", images[i]);
                featured.add(hm);
            }

            String[] from = {"productname", "productprice", "productimage"};
            int[] to = {R.id.tv_ProductName, R.id.tv_ProductPrice, R.id.icon};

            SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, featured, R.layout.listitem_featured, from, to);
            HorizontalListView featuredList = (HorizontalListView) findViewById(R.id.lv_Featured);
            featuredList.setAdapter(adapter);

该产品名称和价格都正确显示。该产品图像不显示在所有。这些图像的URL，例如：

The productname and price are displayed correctly. The product image isn't displayed at all. The images are urls, for example:

的

什么必须做正确显示图像？

What has to be done to display the images correctly?

推荐答案

您不能毕加索传到适配器。你必须创建自己的自定义适配器，它并不像听起来那么令人望而生畏。它甚至可以根据 SimpleAdapter 。像这样的：

you can't "pass Picasso" to the adapter. You have to create your own custom adapter, it's not as daunting as it sounds. It may even be based on the SimpleAdapter. Like this:

public class MyAdapter extends SimpleAdapter{

  public MyAdapter(Context context, List<? extends Map<String, ?>> data, int     resource, String[] from, int[] to){
  super(context, data, resource, from, to);
  }

   public View getView(int position, View convertView, ViewGroup parent){
  // here you let SimpleAdapter built the view normally.
  View v = super.getView(position, convertView, parent);

   // Then we get reference for Picasso
  ImageView img = (ImageView) v.getTag();
  if(img == null){
     img = (ImageView) v.findViewById(R.id.imageOrders);
     v.setTag(img); // <<< THIS LINE !!!!
  }
  // get the url from the data you passed to the `Map`
  String url = ((Map)getItem(position)).get(TAG_IMAGE);
  // do Picasso
  // maybe you could do that by using many ways to start

    Picasso.with(context).load(url)
            .resize(imageWidth, imageWidth).into(img);

  // return the view
  return v;
   }
}

BTW 在自定义适配器就可以使用它BY：

BTW on Custom Adapter you can use it BY:

Picasso.with(context).load(yoururl)
            .resize(imageWidth, imageWidth).into(holder.imageItem);

然后你可以使用这个类不会对参数图片（但它仍然必须内orderList存在）。

Then you can just use this class without the image on the parameters (but it must still exist inside orderList).

ListView list= (ListView) getActivity().findViewById(R.id.list);
ListAdapter adapter =
   new MyAdapter(
            getActivity(),
            orderList,
            R.layout.order_usa_row,
            new String[]{TAG_PRICE,TAG_TITLE,TAG_PSTATUS,TAG_PRICESYMBOL},
            new int[]{R.id.price,R.id.title,R.id.pstatus,R.id.symbol});
 list.setAdapter(adapter);

有关图像大小，我认为你需要重新大小它！如上面的例子 .resize（imageWidth，imageWidth）在希望这帮助！

For image size I think you need to re-size it !! as in example above .resize(imageWidth, imageWidth) hope this help!!

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