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Android ListView分组显示
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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
