Android—滑动ListView保存选中状态

通常，我们使用listview，滑动后，view会被销毁，重新滑动，item的checkbox选中状态会回到默认状态，这里我使用一种方法，保存状态，重新显示是，把原来的状态转到view上面。

首先，写一个实体类，保存数据，用于显示

package com.example.info;

public class Goods {

public int checkimage;
public String goodsname;
public String text;
public boolean ischeck;

public boolean isIscheck() {
return ischeck;
}

public void setIscheck(boolean ischeck) {
this.ischeck = ischeck;
}
public int getCheckimage() {
return checkimage;
}

public void setCheckimage(int checkimage) {
this.checkimage = checkimage;
}

public String getGoodsname() {
return goodsname;
}

public void setGoodsname(String goodsname) {
this.goodsname = goodsname;
}

public Goods(int checkimage, String goodsname,boolean ischeck) {
super();
this.ischeck=ischeck;
this.checkimage = checkimage;
this.goodsname = goodsname;
}

public Goods() {
super();
}

@Override
public String toString() {
return super.toString();
}
}

再写一个adapter

package com.example.adapter;

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

import com.example.info.Goods;
import com.example.listviewselectitem.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.ImageView;
import android.widget.TextView;

public class AppointmentAdapter extends BaseAdapter {
// 填充数据的list
private ArrayList<Goods> foodlist;
// 上下文
private Context context;
// 用来导入布局
private LayoutInflater inflater = null;

// 构造器
public AppointmentAdapter(ArrayList<Goods> list, Context context) {
this.context = context;
this.foodlist = list;
inflater = LayoutInflater.from(context);
}

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

@Override
public Object getItem(int position) {
return foodlist.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.item, null);
holder.imageView = (ImageView) convertView
.findViewById(R.id.food_imager);
holder.txt2 = (TextView) convertView.findViewById(R.id.price);
holder.cb = (CheckBox) convertView.findViewById(R.id.check_box);
// 为view设置标签
convertView.setTag(holder);
} else {
// 取出holder
holder = (ViewHolder) convertView.getTag();
}
// 获取数据
Goods goods = foodlist.get(position);

// 将数据填充到当前convertView的对应控件中

holder.imageView.setImageResource(goods.checkimage);
holder.txt2.setText(goods.goodsname);
// 设置list中TextView的显示
return convertView;
}

public static class ViewHolder {
public TextView txt2;
public ImageView imageView;
public CheckBox cb;
}
}

activity文件

package com.example.listviewselectitem;

import java.util.ArrayList;
import com.example.adapter.AppointmentAdapter;
import com.example.adapter.AppointmentAdapter.ViewHolder;
import com.example.info.Goods;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity implements OnClickListener,
OnItemClickListener {

private ListView listView;
private ArrayList<Goods> goods = new ArrayList<Goods>();
private AppointmentAdapter adapter;
private String[] good={"龙井","绿茶","营养快线","怡宝","范姐炒蛋","牛腩粉","广州早擦","柳州螺蛳粉","桂林米粉","过桥米线","康师傅","牛肉面","麻辣烫"};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();// 初始化控件
initData();// 初始化虚拟数据
adapter = new AppointmentAdapter(goods, getApplicationContext());
listView.setAdapter(adapter);
}

/**
* 初始化控件
* */
public void initView() {
listView = (ListView) findViewById(R.id.drink_list);// listview列表控件
listView.setOnItemClickListener(this);
}

/**
* 初始化数据
* */
public void initData() {

Class cls = R.drawable.class;
try {
for(int i=0;i<good.length;i++)
goods.add(new Goods(cls.getDeclaredField("circularcheckbox_normal").getInt(null),
good[i],false));
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 按钮的点击事件处理
* */
@Override
public void onClick(View v) {
int mID = v.getId();
switch (mID) {
case R.id.order_btn:
//	myPrice();// 计算总价并输出
break;
}
}

/**
* listview的item的选择的方法
* */
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// 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) view.getTag();
// 改变CheckBox的状态
holder.cb.toggle();

boolean ischeck=goods.get(position).isIscheck();
String  goodsname=goods.get(position).goodsname;
Class cls = R.drawable.class;
if(ischeck){
try {
goods.set(position, new Goods(cls.getDeclaredField("circularcheckbox_normal").getInt(null), //如果已经选中，改为未选中状态，保存在<span style="white-space:pre">															</span>//goods里面
goodsname,false));
} catch (Exception e){
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
try {
goods.set(position, new Goods(cls.getDeclaredField("circularcheckbox_press").getInt(null), //如果未选中，改为选中保存
goodsname,true));
} catch (Exception e){
// TODO Auto-generated catch block
e.printStackTrace();
}
}
adapter = new AppointmentAdapter(goods, getApplicationContext());  //再一次刷新adapter和listview
listView.setAdapter(adapter);
}
}

工程源码：http://download.csdn.net/detail/weiguishan/8408475