Android ListView分组显示

ListView的实现方法也是普通的实现方法。只不过在list列表中加入groupkey信息。在渲染的时候要判断是否是分组的标题。

就是在使用不同的两个View的时候存在这种情况，convertView不为空但是由于它渲染到别的layout的关系。它里面内容的view是为空的经常会出现空指针的错误。

我这里使用了一个非常低效的方法，下次应该会改进一下。

先贴上自己实现的adapter

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

 import android.graphics.Bitmap;
 import android.os.AsyncTask;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
 import com.enick.project.base.BaseActivity;
 import com.enick.project.doman.OrderAll;
 import com.enick.project.doman.OrderAll.list;
 import com.enick.project.ui.CH_RackingListDetailActivity;
 import com.enick.project.utils.ViewUtil;
 import com.enick.zdproject.R;

 public class ClothesGroupAdapter extends BaseAdapter {

     private Map<String, List<OrderAll.list>> map = new HashMap<String, List<list>>();
     private List<OrderAll.list> list = new ArrayList<OrderAll.list>();
     private List<OrderAll.list> temp = null;
     private final static String TAG = "RZ";

     public ClothesGroupAdapter(List<OrderAll.list> temp) {
         this.temp = temp;
     }

     @Override
     public void notifyDataSetChanged() {
         map.clear();
         list.clear();
         //先把数据装到map里
         for (int i = 0; i < temp.size(); i++) {
             if(temp.get(i) instanceof list){
                 List<list> tempList =  map.get(temp.get(i).getItemname());
                 if(tempList == null){
                     tempList = new ArrayList<OrderAll.list>();
                     tempList.add(temp.get(i));
                     map.put(temp.get(i).getItemname(),tempList);
                 }else{
                     tempList.add(temp.get(i));
                 }
             }

         }
         //依据map的特性，键就是groupkey。值就是list
         Set<Map.Entry<String, List<OrderAll.list>>> set = map.entrySet();
         for (Iterator<Map.Entry<String, List<OrderAll.list>>> it = set
                 .iterator(); it.hasNext();) {
             Map.Entry<String, List<OrderAll.list>> entry = (Map.Entry<String, List<OrderAll.list>>) it
                     .next();
             OrderAll order = new OrderAll();
             OrderAll.list root = order.getNewList();
             root.setItemname(entry.getKey());
             root.setGroupkey(true);
             list.add(root);
             for (int i = 0; i < entry.getValue().size(); i++) {
                 entry.getValue().get(i).setGroupkey(false);
                 list.add(entry.getValue().get(i));
             }
         }
         super.notifyDataSetChanged();
     }

     @Override
     public int getCount() {
         return list.size();
     }

     @Override
     public Object getItem(int pos) {
         return list.get(pos);
     }

     @Override
     public long getItemId(int pos) {
         return pos;
     }

     @Override
     public View getView(final int position, View convertView, ViewGroup parent) {
         ClothesHolder clothesHolder = null;
         //非常低性能的做法，每次都重新初始化
         if (list.get(position).isGroupkey()) {
             convertView = ViewUtil.buildView(R.layout.ch_racking_list_tag_row);
             clothesHolder = new ClothesHolder();
             clothesHolder.tvTagName = (TextView) convertView.findViewById(R.id.tvTagName);
             String itemName = list.get(position).getItemname();
             if(!ViewUtil.isStrEmpty(itemName)){
                 clothesHolder.tvTagName.setText(itemName);
             }
         }else{
             convertView = ViewUtil.buildView(R.layout.ch_racking_list_row);
             clothesHolder = new ClothesHolder();
             clothesHolder.ivImage = (ImageView) convertView.findViewById(R.id.ivImage);
             clothesHolder.tvName = (TextView) convertView.findViewById(R.id.tvName);
             clothesHolder.tvWenti = (TextView) convertView.findViewById(R.id.tvWenti);
             clothesHolder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
             String subitemName = list.get(position).getSubitemname();
             if (!ViewUtil.isStrEmpty(subitemName)) {
                 clothesHolder.tvName.setText(subitemName);
             }

             String price = list.get(position).getPrice();
             if (!ViewUtil.isStrEmpty(price)) {
                 clothesHolder.tvPrice.setText(price);
             }

             String wenti = list.get(position).getWenti();
             if (!ViewUtil.isStrEmpty(wenti)) {
                 clothesHolder.tvWenti.setText("问题!");
             }
             //网络加载图片，从别的服务器加载
             final String  url = list.get(position).getUrl();
             if (!ViewUtil.isStrEmpty(url)) {
                 if(ViewUtil.isuploadedphoto(url)){//网络图片
                     final ImageView temp=clothesHolder.ivImage;
                     new AsyncTask<Void, Void, Bitmap>() {
                         protected Bitmap doInBackground(Void... p) {
                             return ViewUtil.getHttpBitmap(url,60,60);
                         }
                         @Override
                         public void onPostExecute(Bitmap result) {
                             super.onPostExecute(result);
                             temp.setImageBitmap(result);
                         }

                     }.execute();
                 }else{
                     clothesHolder.ivImage.setImageBitmap(ViewUtil.extractMiniThumb(
                             ViewUtil.getFilePathBitmap(url), 60, 60));
                 }
                 clothesHolder.ivImage.setImageBitmap(ViewUtil.extractMiniThumb(ViewUtil
                         .getFilePathBitmap(url), 60, 60));
             }
             //添加事件
             convertView.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
                     BaseActivity.currentActivity.startCOActivity(CH_RackingListDetailActivity.class,
                                     OrderAll.CLOTHES_ID,list.get(position).getId());
                 }
             });
         }
         return convertView;
     }

     private class ClothesHolder {
         ImageView ivImage;
         TextView tvName;
         TextView tvTagName;
         TextView tvWenti;
         TextView tvPrice;

     }

 }

acitivity只要传入数据集合就可以了

 private List<OrderAll.list> listclothes = new ArrayList<OrderAll.list>();
 private ListView lvClothes;
 private ClothesGroupAdapter adapter;
 adapter = new ClothesGroupAdapter(listclothes);
 lvClothes.setAdapter(adapter);

 listclothes.clear();
 listclothes.addAll(OrderData.getTempOrderAll().getList());
 adapter.notifyDataSetChanged();

界面效果图