Android购物车项目快速开发
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
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