Android购物车项目快速开发

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}

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);} 

/** * 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);}

 @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; }

 /***  * 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(); }

@Overridepublic 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;}