listview使用checkbox批量删除出现的问题

1.选中前面的checkbox导致后的checkbox被选中

2.选中后下滑listview，再上滑时被选中的checkbox又变成未选中状态。

问题大都是因为对listview进行代码优化重用convertView导致的。

解决方法：

package se08.edu.com.example.hxdn.softwareengineeringdate;

import android.content.Context;import android.support.annotation.NonNull;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;

import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Map;import java.util.Set;

/** * Created by hxdn on 2015/9/27. */class MyAdapter extends BaseAdapter {    private Context mcontext;    private int pagesize=15;    private int page=1;    private LayoutInflater inflater=null;    private Person person[];   // private static ArrayList<String> selected;    private Map<Integer,String> selected;    public MyAdapter(Context c,Person p[],int page,int pagesize)    {        this.mcontext=c;        this.person=p;        this.page=page;        this.pagesize=pagesize;        this.inflater=LayoutInflater.from(c);        selected = new HashMap<Integer,String>();    }    public Map<Integer,String> getSelected()    {        return selected;    }    @Override    public int getCount() {        int c=(page-1)*pagesize;        if (person.length-c<pagesize)        {            return person.length-c;        }        else        {            return pagesize;        }

    }

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

    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder=null;        selected = new HashMap<Integer,String>();        if (convertView==null)        {            viewHolder=new ViewHolder();            convertView=inflater.inflate(R.layout.simple_item,parent,false);            viewHolder.iv=(ImageView)convertView.findViewById(R.id.iv);            viewHolder.name=(TextView)convertView.findViewById(R.id.name);            viewHolder.majorId=(TextView)convertView.findViewById(R.id.majorId);            viewHolder.tel=(TextView)convertView.findViewById(R.id.tel);            viewHolder.cb=(CheckBox)convertView.findViewById(R.id.check);            convertView.setTag(viewHolder);        }        else        {

            viewHolder=(ViewHolder)convertView.getTag();        }        viewHolder.cb.setTag(position + pagesize * (page - 1));//设置标签        if (selected.containsKey(position + pagesize * (page - 1)))        //判断listview的item上的checkbox是否被选中,用position+pagesize*(page-1)作为唯一标识        {            viewHolder.cb.setChecked(true);        }        else        {            viewHolder.cb.setChecked(false);        }        if (MainActivity.editModel)        {            viewHolder.cb.setVisibility(View.VISIBLE);        }        else        {            viewHolder.cb.setVisibility(View.GONE);        }        viewHolder.iv.setImageResource(person[position + pagesize * (page - 1)].getImageId());        viewHolder.name.setText(person[position + pagesize * (page - 1)].getName());        viewHolder.tel.setText(person[position + pagesize * (page - 1)].getTel());        viewHolder.majorId.setText(person[position + pagesize * (page - 1)].getMajorId());        viewHolder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {        //OnCheckChangedListener监听CheckBox的状态，无论来自你的onClick事件还是其他。            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if (isChecked)                {                    if(!selected.containsKey(buttonView.getTag()))                    //前面代码进行优化,会对converView进行复用,所以会导致当前面一个checkbox被选中后面的checkbox也被选中                    //于是进行判断,如果selectd没有这个key值，则加入到selectd中                    //之前出现的问题是当我选中第一个checkbox，第十二个也会被选中                    // 加了这个判断后，即使第十二checkbox是因为复用converView导致被选中的,但selectd的key值已经包含了                    //这个信息，selectd便不会将其加入。                    //在前面用selectd进行判断的时候便会把第十二checkbox设置为false；                        selected.put((Integer) buttonView.getTag(),person[position + pagesize * (page - 1)].getMajorId());                    MainActivity.txtcount.setText("共选中:" + selected.size());                }                else                {                    selected.remove((Integer) buttonView.getTag());                    MainActivity.txtcount.setText("共选中:" + selected.size());                }            }        });        return convertView;    }    public class ViewHolder    {        private ImageView iv;        private TextView name;        private TextView majorId;        private TextView tel;        CheckBox cb;    }}