通过下标全选反选，删除

//主类
package com.example.choose;

import java.util.ArrayList;
import java.util.List;
import com.example.adapter.MyChooseAdapter;
import com.example.adapter.MyChooseAdapter.ViewHolder;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

        private ListView lv; 
        private MyChooseAdapter mAdapter; 
        private ArrayList<String> list; 
        private Button bt_selectall; 
        private Button bt_cancel; 
        private Button bt_deselectall; 
        private Button deleteitem;
        private int checkNum; // 记录选中的条目数量 
        private TextView tv_show;// 用于显示选中的条目数量 
        private List<String> data;//定义一个集合   保存选中的条目
        private TextView add;//勾选商品的总会
        private int allnumber=0;
        private boolean flag=true;

        @Override 
        public void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.activity_main); 
            lv = (ListView) findViewById(R.id.lv); 
            bt_selectall = (Button) findViewById(R.id.bt_selectall); 
            bt_cancel = (Button) findViewById(R.id.bt_cancleselectall); 
            bt_deselectall = (Button) findViewById(R.id.bt_deselectall); 
            deleteitem=(Button) findViewById(R.id.deleteItem);
            tv_show = (TextView) findViewById(R.id.tv); 
            add=(TextView) findViewById(R.id.add);
            list = new ArrayList<String>(); 
            // 为Adapter准备数据 
            initDate(); 
            // 实例化自定义的MyAdapter 
            mAdapter = new MyChooseAdapter(list, this); 
            // 绑定Adapter 
            lv.setAdapter(mAdapter); 

            // 全选按钮的回调接口 
            bt_selectall.setOnClickListener(new OnClickListener() { 
                @Override 
                public void onClick(View v) { 
                    // 遍历list的长度，将MyAdapter中的map值全部设为true 
                    for (int i = 0; i < list.size(); i++) {
                        if (MyChooseAdapter.getIsSelected().get(i)==false) {
                            MyChooseAdapter.getIsSelected().put(i, true);
                            if (flag) {
                                 allnumber+=Integer.valueOf(list.get(i));
                            }
                        }
                    } 
                    flag=false;
                    // 数量设为list的长度 
                    checkNum = list.size(); 
                    // 刷新listview和TextView的显示 
                    dataChanged(); 
                } 
            }); 

            // 反选按钮的回调接口 
            bt_cancel.setOnClickListener(new OnClickListener() { 
                @Override 
                public void onClick(View v) { 
                    // 遍历list的长度，将已选的设为未选，未选的设为已选 
                    for (int i = 0; i < list.size(); i++) { 
                        if (MyChooseAdapter.getIsSelected().get(i)) { 
                            MyChooseAdapter.getIsSelected().put(i, false); 
                            checkNum--; 
                            allnumber-=Integer.valueOf(list.get(i));
                        } else { 
                            MyChooseAdapter.getIsSelected().put(i, true); 
                            checkNum++; 
                            allnumber+=Integer.valueOf(list.get(i));
                        } 
                    } 
                    flag=true;
                    // 刷新listview和TextView的显示 
                    dataChanged(); 
                } 
            }); 

            //取消按钮的回调接口 
            bt_deselectall.setOnClickListener(new OnClickListener(){ 
                @Override 
                public void onClick(View v) { 
                    // 遍历list的长度，将已选的按钮设为未选 
                    for (int i = 0; i < list.size(); i++) { 
                        if (MyChooseAdapter.getIsSelected().get(i)) { 
                            MyChooseAdapter.getIsSelected().put(i, false); 
                            checkNum--;// 数量减1 
                            allnumber-=Integer.valueOf(list.get(i));
                        } 
                    } 
                    flag=true;
                    // 刷新listview和TextView的显示 
                    dataChanged(); 
                } 
            }); 
            //删除按钮的回调方法
            deleteitem.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    //遍历list集合  将勾选的在集合中删除
                    data=new ArrayList<String>();
                    for (int i = 0; i < list.size(); i++) {
                        if (MyChooseAdapter.getIsSelected().get(i)) {
                            data.add(list.get(i));
                            MyChooseAdapter.getIsSelected().put(i, false);
                            checkNum--;
                            allnumber-=Integer.valueOf(list.get(i));
                        }
                    }
                    list.removeAll(data);
                    dataChanged();
                }
            });

            // 绑定listView的监听器 
            lv.setOnItemClickListener(new OnItemClickListener() { 
                @Override 
                public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
                        long arg3) { 
                    // 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤 
                    ViewHolder holder = (ViewHolder) arg1.getTag(); 
                    // 改变CheckBox的状态 
                    holder.cb.toggle(); 
                    // 将CheckBox的选中状况记录下来 
                    MyChooseAdapter.getIsSelected().put(arg2, holder.cb.isChecked()); 
                    // 调整选定条目 
                    if (holder.cb.isChecked() == true) { 
                        checkNum++; 
                        allnumber+=Integer.valueOf(list.get(arg2));![这里写图片描述](http://img.blog.youkuaiyun.com/20160416084318565)
                    } else { 
                        checkNum--; 
                        allnumber-=Integer.valueOf(list.get(arg2));
                    } 
                    dataChanged();
                } 
            }); 
        } 


        // 初始化数据 
        private void initDate() { 
            for (int i = 0; i < 50; i++) { 
                list.add(i+"");
            } 

        } 
        // 刷新listview和TextView的显示 
        private void dataChanged() { 
            // 通知listView刷新 
            mAdapter.notifyDataSetChanged(); 
            // TextView显示最新的选中数目 
            tv_show.setText("已选中" + checkNum + "项"); 
            add.setText("勾选的商品的总和是"+allnumber);
        }; 
}

//适配器类
package com.example.adapter;

import java.util.ArrayList;
import java.util.HashMap;

import com.example.choose.R;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

public class MyChooseAdapter extends BaseAdapter{    
    // 填充数据的list 
    private ArrayList<String> list; 
    // 用来控制CheckBox的选中状况 
    private static HashMap<Integer, Boolean> isSelected; 
    // 上下文 
    private Context context; 
    // 用来导入布局 
    private LayoutInflater inflater = null; 
    //构造器
    public MyChooseAdapter(ArrayList<String> list, Context context) {
        super();
        this.list = list;
        this.context = context;
        inflater = LayoutInflater.from(context); 
        isSelected = new HashMap<Integer, Boolean>(); 
        // 初始化数据 
        initDate(); 
    }


    // 初始化isSelected的数据 
    private void initDate() { 
        for (int i = 0; i < list.size(); i++) { 
            getIsSelected().put(i, false); 
        } 
    } 

    @Override 
    public int getCount() { 
        return list.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
        return list.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
        return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
        ViewHolder holder = null; 
        if (convertView == null) { 
            // 获得ViewHolder对象 
            holder = new ViewHolder(); 
            // 导入布局并赋值给convertview 
            convertView = inflater.inflate(R.layout.choose_item, null); 
            holder.tv = (TextView) convertView.findViewById(R.id.item_tv); 
            holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb); 
            // 为view设置标签 
            convertView.setTag(holder); 
        } else { 
            // 取出holder 
            holder = (ViewHolder) convertView.getTag(); 
        } 
        // 设置list中TextView的显示 
        holder.tv.setText(list.get(position)); 
        // 根据isSelected来设置checkbox的选中状况 
        holder.cb.setChecked(getIsSelected().get(position)); 
        return convertView; 
    } 

    public static HashMap<Integer, Boolean> getIsSelected() { 
        return isSelected; 
    } 

    public static void setIsSelected(HashMap<Integer, Boolean> isSelected) { 
        MyChooseAdapter.isSelected = isSelected; 
    } 

    public static class ViewHolder { 
        TextView tv; 
        public CheckBox cb; 
     } 
   }