教你如何解决ListView+CheckBox的冲突

ListView是我们每个Android应用app比不可少的一部分，通常它以列表形式用来展示大数据，在展示时有肯能配合Checkbox来使用，列如：购物车当ListView与CheckBox同时使用的时候可能就会产生一些冲突达不到你期望的效果，一般就会出现一下情况？

焦点冲突

  1. 点击事件冲突
  2. 选中的状态无法保存
  3. ListView滚动时之前保存的状态发生改变

那么产生的原因：主要是ListView的适配器中的getView()方法重复调用，当我们滚动ListView，当之前保存的Item不可见时会移除掉Item的状态解决方案：通过LinkedHashMap这种简直对的方式来保存，通过LinkedHashMap的key于position关联来保存当前Item的状态。问题我们就分析到这至于对不对我们用代码验证，为了简单我用ImageView代替了ChekBox；首先给大家看几张效果图.

 

 

 

 

 

 

 

 

 

 

图片弄得比较丑，咱们忽略不计，等会提供源码连接

  1 /**
  2  * 商品实体类
  3  * @author joe.xiang
  4  */
  5 public class ShoppingModel {
  6     public String pname;
  7     public int prices;
  8     public int pimage;
  9     //是否选中标识
 10     public boolean ischecked=false;
 11     public ShoppingModel(String pname, int prices, int pimage,boolean ischecked) {
 12         super();
 13         this.pname = pname;
 14         this.prices = prices;
 15         this.pimage = pimage;
 16         this.ischecked = ischecked;
 17     }
 18     public boolean isIschecked() {
 19         return ischecked;
 20     }
 21     public void setIschecked(boolean ischecked) {
 22         this.ischecked = ischecked;
 23     }
 24 }
 25 
 26 
 27 
 28 package com.example.listviewandroidcheckbox.activity;
 29 import java.util.ArrayList;
 30 import java.util.LinkedHashMap;
 31 import java.util.List;
 32 import com.example.listviewandroidcheckbox.R;
 33 import com.example.listviewandroidcheckbox.adapter.ListCheckboxAdapter;
 34 import com.example.listviewandroidcheckbox.model.ShoppingModel;
 35 import android.app.Activity;
 36 import android.os.Bundle;
 37 import android.util.Log;
 38 import android.view.View;
 39 import android.view.View.OnClickListener;
 40 import android.widget.Button;
 41 import android.widget.CheckBox;
 42 import android.widget.ListView;
 43 import android.widget.TextView;
 44 import android.widget.Toast;
 45 /**
 46  * 此案列主要是解决ListView和Checkbox的冲突
 47  * @author joe.xiang
 48  */
 49 public class ListViewAndCheckboxActivity extends Activity implements OnClickListener
 50 {
 51     private static final String TAG="ListViewAndCheckboxActivity";
 52     private TextView checknumber;
 53     private ListView listveiw;
 54     private CheckBox allselected;
 55     private Button sumnumber;
 56     private Button deleted;
 57     //保存商品信息
 58     private List<ShoppingModel> listShops;
 59     //保存选中的商品信息
 60     private List<ShoppingModel> NewlistShops;
 61     //绑定数据
 62     private ListCheckboxAdapter adapter;
 63     //true 选中       false 未选中
 64     public static boolean mflag;
 65     //默认不选中
 66     private int number = 0;
 67     //总价格
 68     private int sumprices;
 69     
 70     @Override
 71     protected void onCreate(Bundle savedInstanceState) {
 72         super.onCreate(savedInstanceState);
 73         setContentView(R.layout.activity_main);
 74         initview();
 75     }
 76 
 77     /**
 78      * 初始化布局控件
 79      */
 80     public void initview(){
 81         checknumber = (TextView) findViewById(R.id.checknumber);
 82         listveiw = (ListView) findViewById(R.id.listveiw);
 83         allselected = (CheckBox) findViewById(R.id.allselected);
 84         sumnumber = (Button) findViewById(R.id.sumnumber);
 85         deleted = (Button) findViewById(R.id.deleted);
 86         allselected.setOnClickListener(this);
 87         sumnumber.setOnClickListener(this);
 88         deleted.setOnClickListener(this);
 89         checknumber.setText("你选中了" + number + "个");
 90         listShops = getShopData();
 91         adapter = new ListCheckboxAdapter(this,checknumber);
 92         adapter.setData(listShops, mflag);
 93         listveiw.setAdapter(adapter);
 94     }
 95 
 96     /**
 97      * 获取商品数据(网络数据)
 98      * @return
 99      */
100     public List<ShoppingModel>  getShopData(){
101         listShops = new ArrayList<ShoppingModel>();
102         for (int i = 0; i < 60; i++) {
103             listShops.add(new ShoppingModel("美女"+i, 100, R.drawable.appmain_subject_1,mflag));
104         }
105        return listShops;
106     }
107     
108 
109     @Override
110     public void onClick(View v) {
111             switch (v.getId()) {
112             //全选、反选
113             case R.id.allselected:
114                 String allseted = allselected.getText().toString().trim();
115                 if(allseted.equals("全选")){
116                     mflag = true;
117                     adapter.setData(listShops, mflag);
118                     allselected.setText("反选");
119                     checknumber.setText("你选中了" + listShops.size() + "个");
120                 }else{
121                     mflag = false;
122                     adapter.setData(listShops, mflag);
123                     allselected.setText("全选");
124                     checknumber.setText("你选中了" + number+ "个");
125                 }
126                 break;
127             //删除选中
128             case R.id.deleted:
129                 listShops = bianzhi2();
130                 adapter.setData(listShops, mflag);
131                 checknumber.setText("你选中了" + number + "个");
132                 break;
133             //计算选中的价格
134             case R.id.sumnumber:
135                 for (ShoppingModel sml : listShops) {
136                     if(sml.isIschecked()){
137                         sumprices+=sml.prices;
138                     }
139                 }
140                 ShowToast("总价为" + sumprices);
141                 sumprices = 0;
142                 break;
143             }
144     }
145     
146     
147     
148     //获取你选中的商品信息
149     public List<ShoppingModel> bianzhi2() {
150         ShoppingModel kvalues =null;
151         NewlistShops = new ArrayList<ShoppingModel>();
152         LinkedHashMap<Integer, ShoppingModel> listmap = adapter.shopmap;
153         for (Integer key : listmap.keySet()) {
154             kvalues = listmap.get(key);
155             NewlistShops.add(kvalues);
156         }
157         LogUtil(NewlistShops.size()+"全选大小");
158         listShops.removeAll(NewlistShops);
159         adapter.shopmap.clear();
160         return listShops;
161     }
162     
163     public void LogUtil(String mesglog){
164         Log.i(mesglog, TAG);
165     }
166     public void ShowToast(String mesglog){
167         Toast.makeText(ListViewAndCheckboxActivity.this,mesglog, 1).show();
168     }
169 }
170 
171 package com.example.listviewandroidcheckbox.adapter;
172 import java.util.LinkedHashMap;
173 import java.util.List;
174 import com.example.listviewandroidcheckbox.R;
175 import com.example.listviewandroidcheckbox.model.ShoppingModel;
176 import android.content.Context;
177 import android.view.LayoutInflater;
178 import android.view.View;
179 import android.view.View.OnClickListener;
180 import android.view.ViewGroup;
181 import android.widget.BaseAdapter;
182 import android.widget.CheckBox;
183 import android.widget.ImageView;
184 import android.widget.TextView;
185 
186 
187 public class ListCheckboxAdapter extends BaseAdapter {
188     public Context mContext;
189     public TextView numberview;
190     public CheckBox allselected;
191     public LayoutInflater mInflater;
192     public List<ShoppingModel> listShop ;
193     public static boolean mflag;
194     public static LinkedHashMap<Integer,ShoppingModel> shopmap = new LinkedHashMap<Integer, ShoppingModel>();
195 
196     public ListCheckboxAdapter(Context context,TextView checknumber) {
197         this.mContext = context;
198         this.numberview = checknumber;
199         mInflater = LayoutInflater.from(mContext);
200     }
201     
202     public void setData(List<ShoppingModel> listShops,boolean flag){
203         this.listShop = listShops;
204         for (int i = 0; i < listShop.size(); i++) {
205             listShop.get(i).setIschecked(flag);
206         }
207         notifyDataSetChanged();
208     }
209     
210     
211     @Override
212     public int getCount() {
213         return listShop.size();
214     }
215 
216     @Override
217     public Object getItem(int position) {
218         return listShop.get(position);
219     }
220 
221     @Override
222     public long getItemId(int position) {
223         return position;
224     }
225 
226     @Override
227     public View getView(final int position, View convertView, ViewGroup parent) {
228         final ViewHolder holder ;
229         if(convertView==null){
230             convertView = mInflater.inflate(R.layout.list_item, null); 
231             holder = new ViewHolder();
232             holder.imageview = (ImageView) convertView.findViewById(R.id.pimage);
233             holder.textview = (TextView) convertView.findViewById(R.id.pname);
234             holder.ptextview = (TextView) convertView.findViewById(R.id.prices);
235             holder.stateimageview = (ImageView) convertView.findViewById(R.id.pstate);
236             convertView.setTag(holder);
237         }else{
238             holder = (ViewHolder) convertView.getTag();
239         }
240         if(listShop.get(position).isIschecked()){
241             holder.stateimageview.setImageResource(R.drawable.es_5);
242         }else{
243             holder.stateimageview.setImageResource(R.drawable.es_6);
244         }
245         holder.imageview.setImageResource(listShop.get(position).pimage);
246         holder.textview.setText(listShop.get(position).pname.toString());
247         holder.ptextview.setText(listShop.get(position).prices + "");
248 
249         holder.stateimageview.setOnClickListener(new OnClickListener() {
250             @Override
251             public void onClick(View v) {
252                 if(listShop.get(position).isIschecked()){
253                     listShop.get(position).setIschecked(false);
254                     shopmap.remove(position);
255                     holder.stateimageview.setImageResource(R.drawable.es_6);
256                     numberview.setText("你选中了" + shopmap.size() + "个");
257                 }else {
258                     listShop.get(position).setIschecked(true);
259                     shopmap.put(position, listShop.get(position));
260                     holder.stateimageview.setImageResource(R.drawable.es_5);
261                     numberview.setText("你选中了" + shopmap.size() + "个");
262                 }
263             }
264         });
265         return convertView;
266     }
267     
268     static class ViewHolder{
269         ImageView imageview;
270         TextView textview;
271         TextView ptextview;
272         ImageView stateimageview;
273     }
274 }

 代码里面注释的比较详细，我就不仔细详讲了，最后祝大家新年快乐。

 源码连接：http://i.cnblogs.com/Files.aspx

                                                                                                                    






posted @ 2016-02-14 14:00  android旅途  阅读(210)  评论(0)  编辑  收藏  举报