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.csdn.net/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;
}
}