欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  移动技术

Android购物车项目快速开发

程序员文章站 2024-02-24 13:14:16
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...

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

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

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。