解决Android在listview添加checkbox实现单选多选操作问题

转自： http://blog.csdn.net/failure01/article/details/8561573

在Android某些开发需求当中，有时候需要在listveiw中加入checkbox实现单选，多选操作。表面上看上去只是改变checkbox那么简单，然而实际开发中，实现起来并不是那么得心应手。尤其当listview比较多(比如屏幕最多只能显示10个item，但总共有12个item，也就是说listview的item数大于屏幕能够显示的item数)滑动屏幕的时候，由于适配器中getview()会重复使用被移除屏幕的item，所以会造成checkbox选择状态不正常的现象。自己在开发中碰到这样的问题很是苦恼，查了下资料，发现网上很少没有针对这类批量操作并没有一个完整的例子。搜了很多篇帖子才完美的实现这一常用的操作。所以在这里把这个Demo贴出来，供大家参考，希望能对大家有所帮助。

主界面的布局main.xml 这个就不多说什么

[html]view plaincopy 
   
 <?xml version="1.0" encoding="utf-8"?>    
  ViewHolder {    
     public TextView tv = null;    
     public CheckBox cb = null;    
 }    

为listview自定义适配器，该类为主Activity类MainActivity.java的内部类

[java]view plaincopy 
   
 public static class MyAdapter extends BaseAdapter {    
         public static HashMap<Integer, Boolean> isSelected;    
         private Context context = null;    
         private LayoutInflater inflater = null;    
         private List<HashMap<String, Object>> list = null;    
         private String keyString[] = null;    
         private String itemString = null; // 记录每个item中textview的值     
         private int idValue[] = null;// id值     
     
         public MyAdapter(Context context, List<HashMap<String, Object>> list,    
                 int resource, String[] from, int[] to) {    
             this.context = context;    
             this.list = list;    
             keyString = new String[from.length];    
             idValue = new int[to.length];    
             System.arraycopy(from, 0, keyString, 0, from.length);    
             System.arraycopy(to, 0, idValue, 0, to.length);    
             inflater = LayoutInflater.from(context);    
             init();    
         }    
     
         // 初始化 设置所有checkbox都为未选择     
         public void init() {    
             isSelected = new HashMap<Integer, Boolean>();    
             for (int i = 0; i < list.size(); i++) {    
                 isSelected.put(i, false);    
             }    
         }    
     
         @Override    
         public int getCount() {    
             return list.size();    
         }    
     
         @Override    
         public Object getItem(int arg0) {    
             return list.get(arg0);    
         }    
     
         @Override    
         public long getItemId(int arg0) {    
             return 0;    
         }    
     
         @Override    
         public View getView(int position, View view, ViewGroup arg2) {    
             ViewHolder holder = new ViewHolder();    
                    
                 if (view == null) {    
                     view = inflater.inflate(R.layout.listviewitem, null);    
                 }    
                 holder.tv = (TextView) view.findViewById(R.id.item_tv);    
                 holder.cb = (CheckBox) view.findViewById(R.id.item_cb);    
                 view.setTag(holder);    
             }   
             HashMap<String, Object> map = list.get(position);    
             if (map != null) {    
                 itemString = (String) map.get(keyString[0]);    
                 holder.tv.setText(itemString);    
             }    
             holder.cb.setChecked(isSelected.get(position));    
             return view;    
         }    
     
     }    

最后，最重要的就是MainActivity.java中一些事件响应的处理

[java]view plaincopy 
   
 public class MainActivity extends Activity {    
     TextView tv = null;    
     ListView lv = null;    
     Button btn_selectAll = null;    
     Button btn_inverseSelect = null;    
     Button btn_calcel = null;    
     String name[] = { "G1", "G2", "G3", "G4", "G5", "G6", "G7", "G8", "G9",    
             "G10", "G11", "G12", "G13", "G14" };    
         
     ArrayList<String> listStr = null;    
     private List<HashMap<String, Object>> list = null;    
     private MyAdapter adapter;    
     
     @Override    
     public void onCreate(Bundle savedInstanceState) {    
         super.onCreate(savedInstanceState);    
         setContentView(R.layout.main);    
         tv = (TextView) this.findViewById(R.id.tv);    
         lv = (ListView) this.findViewById(R.id.lv);    
         btn_selectAll = (Button) this.findViewById(R.id.selectall);    
         btn_inverseSelect = (Button) this.findViewById(R.id.inverseselect);    
         btn_calcel = (Button) this.findViewById(R.id.cancel);    
         showCheckBoxListView();    
             
         //全选     
         btn_selectAll.setOnClickListener(new OnClickListener(){    
             @Override    
             public void onClick(View arg0) {    
                 listStr = new ArrayList<String>();    
                 for(int i=0;i<list.size();i++){    
                     MyAdapter.isSelected.put(i,true);    
                     listStr.add(name[i]);    
                 }    
                 adapter.notifyDataSetChanged();//注意这一句必须加上，否则checkbox无法正常更新状态     
                 tv.setText("已选中"+listStr.size()+"项");    
             }    
         });    
             
         //反选     
         btn_inverseSelect.setOnClickListener(new OnClickListener(){    
             @Override    
             public void onClick(View v) {    
                 for(int i=0;i<list.size();i++){    
                     if(MyAdapter.isSelected.get(i)==false){    
                         MyAdapter.isSelected.put(i, true);    
                         listStr.add(name[i]);    
                     }    
                     else{    
                         MyAdapter.isSelected.put(i, false);    
                         listStr.remove(name[i]);    
                     }    
                 }    
                 adapter.notifyDataSetChanged();    
                 tv.setText("已选中"+listStr.size()+"项");    
             }    
                 
         });    
             
         //取消已选     
         btn_calcel.setOnClickListener(new OnClickListener(){    
             @Override    
             public void onClick(View v) {    
                 for(int i=0;i<list.size();i++){    
                     if(MyAdapter.isSelected.get(i)==true){    
                         MyAdapter.isSelected.put(i, false);    
                         listStr.remove(name[i]);    
                     }    
                 }    
                 adapter.notifyDataSetChanged();    
                 tv.setText("已选中"+listStr.size()+"项");    
             }    
                 
         });    
     }    
     
     // 显示带有checkbox的listview     
     public void showCheckBoxListView() {    
         list = new ArrayList<HashMap<String, Object>>();    
         for (int i = 0; i < name.length; i++) {    
             HashMap<String, Object> map = new HashMap<String, Object>();    
             map.put("item_tv", name[i]);    
             map.put("item_cb", false);    
             list.add(map);    
     
             adapter = new MyAdapter(this, list, R.layout.listviewitem,    
                     new String[] { "item_tv", "item_cb" }, new int[] {    
                             R.id.item_tv, R.id.item_cb });    
             lv.setAdapter(adapter);    
             listStr = new ArrayList<String>();    
             lv.setOnItemClickListener(new OnItemClickListener() {    
     
                 @Override    
                 public void onItemClick(AdapterView<?> arg0, View view,    
                         int position, long arg3) {    
                     ViewHolder holder = (ViewHolder) view.getTag();    
                     holder.cb.toggle();// 在每次获取点击的item时改变checkbox的状态     
                     MyAdapter.isSelected.put(position, holder.cb.isChecked()); // 同时修改map的值保存状态     
                     if (holder.cb.isChecked() == true) {    
                         listStr.add(name[position]);    
                     } else {    
                         listStr.remove(name[position]);    
                     }    
                     tv.setText("已选中"+listStr.size()+"项");    
                 }    
     
             });    
         }    
     }    
     
     //为listview自定义适配器内部类     
     public static class MyAdapter extends BaseAdapter {    
         ...    
     }    
 }    

结果如下

解决Android在listview添加checkbox实现单选多选操作问题

浏览过的版块