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
1 import java.util.ArrayList;
2 import java.util.HashMap;
3 import java.util.Iterator;
4 import java.util.List;
5 import java.util.Map;
6 import java.util.Set;
7
8 import android.graphics.Bitmap;
9 import android.os.AsyncTask;
10 import android.view.View;
11 import android.view.ViewGroup;
12 import android.widget.BaseAdapter;
13 import android.widget.ImageView;
14 import android.widget.TextView;
15 import com.enick.project.base.BaseActivity;
16 import com.enick.project.doman.OrderAll;
17 import com.enick.project.doman.OrderAll.list;
18 import com.enick.project.ui.CH_RackingListDetailActivity;
19 import com.enick.project.utils.ViewUtil;
20 import com.enick.zdproject.R;
21
22 public class ClothesGroupAdapter extends BaseAdapter {
23
24 private Map<String, List<OrderAll.list>> map = new HashMap<String, List<list>>();
25 private List<OrderAll.list> list = new ArrayList<OrderAll.list>();
26 private List<OrderAll.list> temp = null;
27 private final static String TAG = "RZ";
28
29 public ClothesGroupAdapter(List<OrderAll.list> temp) {
30 this.temp = temp;
31 }
32
33 @Override
34 public void notifyDataSetChanged() {
35 map.clear();
36 list.clear();
37 //先把数据装到map里
38 for (int i = 0; i < temp.size(); i++) {
39 if(temp.get(i) instanceof list){
40 List<list> tempList = map.get(temp.get(i).getItemname());
41 if(tempList == null){
42 tempList = new ArrayList<OrderAll.list>();
43 tempList.add(temp.get(i));
44 map.put(temp.get(i).getItemname(),tempList);
45 }else{
46 tempList.add(temp.get(i));
47 }
48 }
49
50 }
51 //依据map的特性，键就是groupkey。值就是list
52 Set<Map.Entry<String, List<OrderAll.list>>> set = map.entrySet();
53 for (Iterator<Map.Entry<String, List<OrderAll.list>>> it = set
54 .iterator(); it.hasNext();) {
55 Map.Entry<String, List<OrderAll.list>> entry = (Map.Entry<String, List<OrderAll.list>>) it
56 .next();
57 OrderAll order = new OrderAll();
58 OrderAll.list root = order.getNewList();
59 root.setItemname(entry.getKey());
60 root.setGroupkey(true);
61 list.add(root);
62 for (int i = 0; i < entry.getValue().size(); i++) {
63 entry.getValue().get(i).setGroupkey(false);
64 list.add(entry.getValue().get(i));
65 }
66 }
67 super.notifyDataSetChanged();
68 }
69
70 @Override
71 public int getCount() {
72 return list.size();
73 }
74
75 @Override
76 public Object getItem(int pos) {
77 return list.get(pos);
78 }
79
80 @Override
81 public long getItemId(int pos) {
82 return pos;
83 }
84
85 @Override
86 public View getView(final int position, View convertView, ViewGroup parent) {
87 ClothesHolder clothesHolder = null;
88 //非常低性能的做法，每次都重新初始化
89 if (list.get(position).isGroupkey()) {
90 convertView = ViewUtil.buildView(R.layout.ch_racking_list_tag_row);
91 clothesHolder = new ClothesHolder();
92 clothesHolder.tvTagName = (TextView) convertView.findViewById(R.id.tvTagName);
93 String itemName = list.get(position).getItemname();
94 if(!ViewUtil.isStrEmpty(itemName)){
95 clothesHolder.tvTagName.setText(itemName);
96 }
97 }else{
98 convertView = ViewUtil.buildView(R.layout.ch_racking_list_row);
99 clothesHolder = new ClothesHolder();
100 clothesHolder.ivImage = (ImageView) convertView.findViewById(R.id.ivImage);
101 clothesHolder.tvName = (TextView) convertView.findViewById(R.id.tvName);
102 clothesHolder.tvWenti = (TextView) convertView.findViewById(R.id.tvWenti);
103 clothesHolder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
104 String subitemName = list.get(position).getSubitemname();
105 if (!ViewUtil.isStrEmpty(subitemName)) {
106 clothesHolder.tvName.setText(subitemName);
107 }
108
109 String price = list.get(position).getPrice();
110 if (!ViewUtil.isStrEmpty(price)) {
111 clothesHolder.tvPrice.setText(price);
112 }
113
114 String wenti = list.get(position).getWenti();
115 if (!ViewUtil.isStrEmpty(wenti)) {
116 clothesHolder.tvWenti.setText("问题!");
117 }
118 //网络加载图片，从别的服务器加载
119 final String url = list.get(position).getUrl();
120 if (!ViewUtil.isStrEmpty(url)) {
121 if(ViewUtil.isuploadedphoto(url)){//网络图片
122 final ImageView temp=clothesHolder.ivImage;
123 new AsyncTask<Void, Void, Bitmap>() {
124 protected Bitmap doInBackground(Void... p) {
125 return ViewUtil.getHttpBitmap(url,60,60);
126 }
127 @Override
128 public void onPostExecute(Bitmap result) {
129 super.onPostExecute(result);
130 temp.setImageBitmap(result);
131 }
132
133 }.execute();
134 }else{
135 clothesHolder.ivImage.setImageBitmap(ViewUtil.extractMiniThumb(
136 ViewUtil.getFilePathBitmap(url), 60, 60));
137 }
138 clothesHolder.ivImage.setImageBitmap(ViewUtil.extractMiniThumb(ViewUtil
139 .getFilePathBitmap(url), 60, 60));
140 }
141 //添加事件
142 convertView.setOnClickListener(new View.OnClickListener() {
143 @Override
144 public void onClick(View v) {
145 BaseActivity.currentActivity.startCOActivity(CH_RackingListDetailActivity.class,
146 OrderAll.CLOTHES_ID,list.get(position).getId());
147 }
148 });
149 }
150 return convertView;
151 }
152
153 private class ClothesHolder {
154 ImageView ivImage;
155 TextView tvName;
156 TextView tvTagName;
157 TextView tvWenti;
158 TextView tvPrice;
159
160 }
161
162 }
acitivity只要传入数据集合就可以了
1 private List<OrderAll.list> listclothes = new ArrayList<OrderAll.list>(); 2 private ListView lvClothes; 3 private ClothesGroupAdapter adapter; 4 adapter = new ClothesGroupAdapter(listclothes); 5 lvClothes.setAdapter(adapter); 6 7 listclothes.clear(); 8 listclothes.addAll(OrderData.getTempOrderAll().getList()); 9 adapter.notifyDataSetChanged();
界面效果图
时间： 2024-10-01 18:42:36