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