购物车项目，业务需要实现了一个购物车的项目，简单的了解下实现逻辑：数据计算等是在adapter中计算出来的，通过在adapter中计算出来的数据就可以回调到activity中进行订单操作等功能业务逻辑，每一个店铺产生的数据是走一条流程的，（业务需求：不是作为一个类似淘宝，京东的平台数据又由平台分发，所以我们实现的是一对一的客户交易的交易流程)接着往下看：
1.界面使用到的控件
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goodsadapter = new goodscaradapter(shopcaravtivity.this, result);
lv_refresh.setadapter(goodsadapter);
goodsadapter.setcheckinterface(shopcaravtivity.this);// 关键步骤1,设置复选框接口
goodsadapter.setmodifycountinterface(shopcaravtivity.this);// 关键步骤2,设置数量增减接口
for (int i = 0; i < goodsadapter.getgroupcount(); i++) {
lv_refresh.expandgroup(i);// 关键步骤3,初始化时，将expandablelistview以展开的方式呈现
}
2.项目中使用到的数据接口
界面当中的复选框的接口回调
public interface checkgoodslistener {
/**
* 组选框状态改变触发的事件
*
* @param groupposition 组元素位置
* @param ischecked 组元素选中与否
*/
void checkgroup(int groupposition, boolean ischecked);
/**
* 子选框状态改变时触发的事件
*
* @param groupposition 组元素位置
* @param childposition 子元素位置
* @param ischecked 子元素选中与否
*/
void checkchild(int groupposition, int childposition, boolean ischecked);
/**
* 购买
* @param groupposition
* @param childposition
* @param ischecked
*/
void checkgoodsbuy(shopcarmodel shopcarmodel, double totalmonery, int totalcount);
}
商品增加和修改的接口
/**
* 改变数量的接口
* created by zhuangah on 2016-11-7.
*/
public interface modifycountlistener {
/**
* 增加操作
*
* @param groupposition 组元素位置
* @param childposition 子元素位置
* @param showcountview 用于展示变化后数量的view
* @param ischecked 子元素选中与否
*/
void doincrease(int groupposition, int childposition, view showcountview, boolean ischecked);
/**
* 删减操作
*
* @param groupposition 组元素位置
* @param childposition 子元素位置
* @param showcountview 用于展示变化后数量的view
* @param ischecked 子元素选中与否
*/
void dodecrease(int groupposition, int childposition, view showcountview, boolean ischecked);
/**
* 删除子item
*
* @param groupposition
* @param childposition
*/
void childdelete(int groupposition, int childposition);
}
3.在adapter中计算商品的金额数量
单个店铺中有多个商品，所以这个店铺的布局，包含选择全组的按钮，使用了接口的回调 checkinterface.checkgroup(groupposition, ((checkbox) v).ischecked());来判断是否选中全组，在activity中进行数据的便利是否选中商品之后再刷新数据。
@override
public view getgroupview(final int groupposition, boolean isexpanded, view convertview, viewgroup parent) {
groupviewholder gholder = null;
if (convertview != null && !(convertview.gettag() instanceof groupviewholder)) {
convertview = null;
}
if (convertview == null) {
gholder = new groupviewholder();
convertview = view.inflate(context, r.layout.item_shopcart_group, null);
gholder.determinechekbox = (checkbox) convertview.findviewbyid(r.id.determine_chekbox);
gholder.tvsourcename = (textview) convertview.findviewbyid(r.id.tv_source_name);
convertview.settag(gholder);
} else {
gholder = (groupviewholder) convertview.gettag();
}
final shopcarmodel group = (shopcarmodel) getgroup(groupposition);
gholder.tvsourcename.settext(group.getfactoryname());
gholder.determinechekbox.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
group.setchoosed(((checkbox) v).ischecked());
checkinterface.checkgroup(groupposition, ((checkbox) v).ischecked());
}
});
gholder.determinechekbox.setchecked(group.ischoosed());
return convertview;
}
在activity中计算便利数据
/***
* 校对组元素
*
* @param groupposition 组元素位置
* @param ischecked 组元素选中与否
*/
@override
public void checkgroup(int groupposition, boolean ischecked) {
list<goodsmodel> goodsmodellist = shopcarmodellist.get(groupposition).getgoodsmodel();
for (int i = 0; i < goodsmodellist.size(); i++) {
goodsmodellist.get(i).setchoosed(ischecked);
}
goodsadapter.notifydatasetchanged();
}
在商品中计算数据结果：
@override
public view getchildview(final int groupposition, final int childposition, final boolean islastchild, view convertview, final viewgroup parent) {
goodsviewholder goodsviewholder = null;
int totalcount = 0;
double totalprice = 0.00;
if (convertview != null && !(convertview.gettag() instanceof goodsviewholder)) {
convertview = null;
}
if (convertview == null) {
goodsviewholder = new goodsviewholder();
convertview = view.inflate(context, r.layout.item_shopcart_product, null);
goodsviewholder.checkbox = (checkbox) convertview.findviewbyid(r.id.check_box);
goodsviewholder.ivadapterlistpic = (imageview) convertview.findviewbyid(r.id.iv_adapter_list_pic);
goodsviewholder.tvintro = (textview) convertview.findviewbyid(r.id.tv_intro);
goodsviewholder.tvprice = (textview) convertview.findviewbyid(r.id.tv_price);
goodsviewholder.tvbuynum = (textview) convertview.findviewbyid(r.id.tv_buy_num);
goodsviewholder.rlnoedtor = (relativelayout) convertview.findviewbyid(r.id.rl_no_edtor);
goodsviewholder.tvreduce = (textview) convertview.findviewbyid(r.id.tv_reduce);
goodsviewholder.tvnum = (textview) convertview.findviewbyid(r.id.tv_num);
goodsviewholder.tvadd = (textview) convertview.findviewbyid(r.id.tv_add);
goodsviewholder.llchangenum = (linearlayout) convertview.findviewbyid(r.id.ll_change_num);
goodsviewholder.layout_item_foot = (linearlayout) convertview.findviewbyid(r.id.layout_item_foot);
goodsviewholder.tv_goods_number = (textview) convertview.findviewbyid(r.id.tv_goods_number);
goodsviewholder.tv_goods_menoy = (textview) convertview.findviewbyid(r.id.tv_goods_menoy);
goodsviewholder.tv_buys = (textview) convertview.findviewbyid(r.id.tv_buys);
goodsviewholder.laytou_car = (linearlayout) convertview.findviewbyid(r.id.laytou_car);
convertview.settag(goodsviewholder);
} else {
goodsviewholder = (goodsviewholder) convertview.gettag();
}
//进行数据操作
final goodsmodel goodsinfo = (goodsmodel) getchild(groupposition, childposition);
if (goodsinfo != null) {
//数量初始化为0,金额初始化为0
goodsviewholder.tv_goods_number.settext(typeutils.tostring(0));
goodsviewholder.tv_goods_menoy.settext("￥ " + numberutils.formatmoneyscale(0.00));
list<goodsmodel> goodsmodel = carutrils.getgoodslist(goodshop, groupposition);
//判断是否最后一个
if ((goodsmodel.size() - 1) == childposition) {
goodsviewholder.layout_item_foot.setvisibility(view.visible);
/**
* 统计操作<br>
* 1.先清空全局计数器<br>
* 2.遍历所有子元素，只要是被选中状态的，就进行相关的计算操作<br>
* 3.给底部的textview进行数据填充
*/
//1判断商品是否选中,再进行计算
for (int j = 0; j < goodsmodel.size(); j++) {
goodsmodel model = goodsmodel.get(j);
if (model.ischoosed()) {
totalcount += model.getselectqty();
totalprice += typeutils.todouble(numberutils.multiply(typeutils.tobigdecimal(numberutils.formatrounded(model.getprice())), numberutils.tobigdecimal(model.getselectqty())));
}
}
if (totalprice != 0.00) {
goodsviewholder.tv_goods_number.settext(typeutils.tostring(totalcount));
goodsviewholder.tv_goods_menoy.settext(numberutils.formatrounded(typeutils.tobigdecimal(totalprice)));
goodsviewholder.tv_buys.setbackgroundcolor(context.getresources().getcolor(r.color.main_color));
goodsviewholder.tv_buys.setenabled(true);
} else {
goodsviewholder.tv_goods_number.settext(typeutils.tostring(0));
goodsviewholder.tv_goods_menoy.settext("￥ " + numberutils.formatmoneyscale(0.00));
goodsviewholder.tv_buys.setbackgroundcolor(context.getresources().getcolor(r.color.resport_line));
goodsviewholder.tv_buys.setenabled(false);
}
} else {
goodsviewholder.layout_item_foot.setvisibility(view.gone);
}
//设置基础数据
if (goodsinfo.getimagesrc() != null) {
glide.with(context)
.load(goodsinfo.getimagesrc())
.centercrop()
.placeholder(r.mipmap.test2)
.crossfade()
.into(goodsviewholder.ivadapterlistpic);
}
goodsviewholder.tvintro.settext(goodsinfo.getname());
goodsviewholder.tvprice.settext("￥ " + numberutils.formatrounded(goodsinfo.getprice()));
goodsviewholder.tvbuynum.settext("x " + numberutils.formatqty(goodsinfo.getqty()));
//set goods check
goodsviewholder.checkbox.setchecked(goodsinfo.ischoosed());
goodsviewholder.tvnum.settext(typeutils.tostring(goodsinfo.getselectqty()));
//选中的状态下才能触发点击事件
goodsviewholder.tvadd.setenabled(true);
goodsviewholder.tvreduce.setenabled(true);
//加减
final goodsviewholder finalgoodsviewholder = goodsviewholder;
goodsviewholder.tvadd.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
modifycountinterface.doincrease(groupposition, childposition, finalgoodsviewholder.tvnum, finalgoodsviewholder.checkbox.ischecked());// 暴露增加接口
}
});
final goodsviewholder finalgoodsviewholder1 = goodsviewholder;
goodsviewholder.tvreduce.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
modifycountinterface.dodecrease(groupposition, childposition, finalgoodsviewholder1.tvnum, finalgoodsviewholder1.checkbox.ischecked());// 暴露删减接口
}
});
//goods check state onclick
goodsviewholder.checkbox.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
goodsinfo.setchoosed(((checkbox) v).ischecked());
((checkbox) v).setchecked(((checkbox) v).ischecked());
checkinterface.checkchild(groupposition, childposition, ((checkbox) v).ischecked());
}
});
//onclick to orderdetailactivity
final double finaltotalprice = totalprice;
final int finaltotalcount = totalcount;
goodsviewholder.tv_buys.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
//check goods is not null
//if not null can go other activity
shopcarmodel shopcar = carutrils.getcheckshopcar(goodshop, groupposition);
if (shopcar != null && shopcar.getgoodsmodel().size() > 0) {
checkinterface.checkgoodsbuy(shopcar, finaltotalprice, finaltotalcount);
}
}
});
}
goodsviewholder.laytou_car.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
uihelper.toshopcargoodsdetailactivity(context, goodsinfo);
}
});
return convertview;
}
以上代码的是先判断当前组是否为一个店铺中的最后一个，在最后一个元素中局部计算当前的group的数据，根据数据来选择是否复位数据展示以及显示，把计算的数据展示出来，最后通过接口回调的方式跳转界面，把数据传到activity中去。就这样子就处理完这个购物车的逻辑，以上可能不符合你的逻辑，但是你可以稍微修改就拿来使用。
github地址: https://github.com/anhuifix/singleshopcar/tree/master
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