package com.example.shoppingcart.model; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.CheckBox; import android.widget.ImageView; import android.widget.TextView; import com.bumptech.glide.Glide; import com.bumptech.glide.request.RequestOptions; import com.example.shoppingcart.R; import com.example.shoppingcart.view.activity.AddAndRemove; import java.util.List; public class CartAdapter extends BaseExpandableListAdapter {
      private List
    
      list;     public CartAdapter(List
     
       list) {
          this.list = list;     }     @Override     public int getGroupCount() {
          return list == null ? 0 : list.size();     }     @Override     public int getChildrenCount(int i) {
          return list.get(i).getShoppingCartList() == null ? 0 : list.get(i).getShoppingCartList().size();     }     @Override     public Object getGroup(int i) {
          return null;     }     @Override     public Object getChild(int i, int i1) {
          return null;     }     @Override     public long getGroupId(int i) {
          return 0;     }     @Override     public long getChildId(int i, int i1) {
          return 0;     }     @Override     public boolean hasStableIds() {
          return false;     }     @Override     public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {
          final GroupViewHolder groupViewHolder;         if (view == null) {
              view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.group_item, viewGroup, false);             groupViewHolder = new GroupViewHolder(view);             view.setTag(groupViewHolder);         } else {
              groupViewHolder = (GroupViewHolder) view.getTag();         }         groupViewHolder.textview_shangjia.setText(list.get(i).getCategoryName());         //当前商家的货物列表         final List
      
        shoppingCartList = list.get(i).getShoppingCartList();         // TODO: 2019/9/7 调用方法对所有的商品进行判断，如果有一个为false则商家为false         boolean getgroupischeck = getgroupischeck(shoppingCartList);         //对商家进行赋值         groupViewHolder.checkbox_shangjia.setChecked(getgroupischeck);         groupViewHolder.checkbox_shangjia.setOnClickListener(new View.OnClickListener() {
              @Override             public void onClick(View view) {
                  //点击后将原来的状态置返                 // TODO: 2019/9/7 调用方法对所有的商品进行判断，如果有一个为false则商家为false                 boolean getgroupischeck = getgroupischeck(shoppingCartList);                 //点击取反                 boolean b1 = !getgroupischeck;                 //讲置返后的状态设置给当前商家下的所有商品                 for (int j = 0; j < shoppingCartList.size(); j++) {
                      CartBean.ResultBean.ShoppingCartListBean shoppingCartListBean = shoppingCartList.get(j);                     shoppingCartListBean.setIschecked(b1);                 }                 //调用接口与底部实现联动                 onCartAdapterChangeListener.onGroupCheckedStatusChange(i);                 notifyDataSetChanged();             }         });         return view;     }     @Override     public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
          //获取到当前商家的商品集合         final List
       
         shoppingCartList = list.get(i).getShoppingCartList();         ChildViewHolder childViewHolder;         if (view == null) {
              view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.child_item, viewGroup, false);             childViewHolder = new ChildViewHolder(view);             view.setTag(childViewHolder);         } else {
              childViewHolder = (ChildViewHolder) view.getTag();         }         //赋值         childViewHolder.product_price_tv.setText(shoppingCartList.get(i1).getPrice() + "");         childViewHolder.product_title_name_tv.setText(shoppingCartList.get(i1).getCommodityName() + "");         Glide.with(viewGroup.getContext())                 .load(shoppingCartList.get(i1).getPic())                 .error(R.mipmap.ic_launcher)                 .apply(RequestOptions.circleCropTransform())                 .into(childViewHolder.product_icon_iv);         childViewHolder.child_cb.setChecked(shoppingCartList.get(i1).isIschecked());         //商品的点击事件         childViewHolder.child_cb.setOnClickListener(new View.OnClickListener() {
              @Override             public void onClick(View view) {
                  //修改当前商品checkbox的值                 shoppingCartList.get(i1).setIschecked(!shoppingCartList.get(i1).isIschecked());                 //刷新适配器重新计算商家的状态                 notifyDataSetChanged();                 //通知底部刷新价格                 onCartAdapterChangeListener.onChildCheckedStatusChange(i, i1);             }         });         //改变加减器的值         childViewHolder.addandremove.setCount(shoppingCartList.get(i1).getCount());         //加减器的监听         childViewHolder.addandremove.setOnNumberChangeListener(new AddAndRemove.OnNumberChangeListener() {
              @Override             public void changed(int num) {
                  //做了三件事  1、修改商品数据的数量 2、刷新适配器（重新修改view状态）3 通知底部状态栏改变                 //修改商品数据的数量                 shoppingCartList.get(i1).setCount(num);                 //刷新适配器                 notifyDataSetChanged();                 //通知底部刷新价格                 if (onCartAdapterChangeListener != null) {
                      onCartAdapterChangeListener.onChildNumberChange(i, i1);                 }             }         });         return view;     }     @Override     public boolean isChildSelectable(int i, int i1) {
          return false;     }     public static     class GroupViewHolder {
          public View rootView;         public CheckBox checkbox_shangjia;         public TextView textview_shangjia;         public GroupViewHolder(View rootView) {
              this.rootView = rootView;             this.checkbox_shangjia = (CheckBox) rootView.findViewById(R.id.checkbox_shangjia);             this.textview_shangjia = (TextView) rootView.findViewById(R.id.textview_shangjia);         }     }     public static     class ChildViewHolder {
          public View rootView;         public CheckBox child_cb;         public ImageView product_icon_iv;         public TextView product_title_name_tv;         public TextView product_price_tv;         public AddAndRemove addandremove;         public ChildViewHolder(View rootView) {
              this.rootView = rootView;             this.child_cb = (CheckBox) rootView.findViewById(R.id.child_cb);             this.product_icon_iv = (ImageView) rootView.findViewById(R.id.product_icon_iv);             this.product_title_name_tv = (TextView) rootView.findViewById(R.id.product_title_name_tv);             this.product_price_tv = (TextView) rootView.findViewById(R.id.product_price_tv);             this.addandremove = (AddAndRemove) rootView.findViewById(R.id.addandremove);         }     }     /**      * 获取当前状态      */     private boolean getgroupischeck(List
        
          shoppingCartList) {
          //对所有的商品进行判断，如果有一个为false则商家为false         boolean groupIsChecked = true;         for (int j = 0; j < shoppingCartList.size(); j++) {
              CartBean.ResultBean.ShoppingCartListBean shoppingCartListBean = shoppingCartList.get(j);             if (!shoppingCartListBean.isIschecked()) {
                  groupIsChecked = false;                 break;             }         }         return groupIsChecked;     }     public interface OnCartAdapterChangeListener {
          void onChildCheckedStatusChange(int groupPositon, int childPosition);         void onChildNumberChange(int groupPositon, int childPosition);         void onGroupCheckedStatusChange(int groupPositon);     }     OnCartAdapterChangeListener onCartAdapterChangeListener;     public void setOnCartAdapterChangeListener(OnCartAdapterChangeListener onCartAdapterChangeListener) {
          this.onCartAdapterChangeListener = onCartAdapterChangeListener;     }     /**      * 计算所有商品是否全部被选中      */     public boolean isAllChecked() {
          boolean isAllChecked = true;         for (int i = 0; i < list.size(); i++) {
              CartBean.ResultBean resultBean = list.get(i);             List
         
           shoppingCartList = resultBean.getShoppingCartList(); for (int j = 0; j < shoppingCartList.size(); j++) { boolean ischecked = shoppingCartList.get(j).isIschecked(); if (!ischecked) { isAllChecked = false; } } } return isAllChecked; } /** * 计算总价 */ public double AllOfThePrice() { double totalorice = 0.0; for (int i = 0; i < list.size(); i++) { List
          
            shoppingCartList = list.get(i).getShoppingCartList(); for (int j = 0; j < shoppingCartList.size(); j++) { boolean ischecked = shoppingCartList.get(j).isIschecked(); if (ischecked) { totalorice += shoppingCartList.get(j).getPrice() * shoppingCartList.get(j).getCount(); } } } return totalorice; } /** * 计算总数 */ public int AllOfTheCount() { int totalorice = 0; for (int i = 0; i < list.size(); i++) { List
           
             shoppingCartList = list.get(i).getShoppingCartList(); for (int j = 0; j < shoppingCartList.size(); j++) { boolean ischecked = shoppingCartList.get(j).isIschecked(); if (ischecked) { totalorice += shoppingCartList.get(j).getCount(); } } } return totalorice; } /** * 全选按钮改变所有商品的状态 */ public void changeAllCheckBoxStatus(boolean is) { for (int i = 0; i < list.size(); i++) { List
            
              shoppingCartList = list.get(i).getShoppingCartList(); for (int j = 0; j < shoppingCartList.size(); j++) { shoppingCartList.get(j).setIschecked(is); } } notifyDataSetInvalidated(); } } 在activity中对底部和购物车的数据市实现联动
            
           
          
         
        
       
      
     
    

package com.example.shoppingcart.view.activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.ExpandableListView; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import com.example.shoppingcart.R; import com.example.shoppingcart.model.CartAdapter; import com.example.shoppingcart.model.CartBean; import com.example.shoppingcart.presenter.CartPresenter; import com.example.shoppingcart.view.interfaces.ContractClass; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class CartActivity extends AppCompatActivity implements ContractClass.LoginBase, View.OnClickListener {
      private CartPresenter cartPresenter;     private ExpandableListView expandablelistview;     private CheckBox checkbox_quanxuan;     private TextView textview;     private CartAdapter cartAdapter;     private ArrayList
    
      list;     private Button button_jiesuan;     private double anInt;     private int i;     private boolean allChecked;     @Override     protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);         setContentView(R.layout.shoppingcart_main);         initView();         cartPresenter = new CartPresenter();         cartPresenter.attachView(this);         Intent intent = getIntent();         String userid = intent.getStringExtra("userid");         String userid2 = intent.getStringExtra("userid2");         Map
     
       headersMap = new HashMap<>();         headersMap.put("userId", userid);         headersMap.put("sessionId", userid2);         cartPresenter.Cart("http://172.17.8.100/", headersMap);     }     @Override     public void response(Object o) {
          CartBean loginBean = (CartBean) o;         Log.i("TAG", "response: " + loginBean.getMessage());         if ("0000".equals(loginBean.getStatus())) {
              List
      
        result = loginBean.getResult();             list.addAll(result);             for (int i = 0; i < list.size(); i++) {
                  expandablelistview.expandGroup(i);             }             cartAdapter.notifyDataSetChanged();         }     }     private void initView() {
          expandablelistview = (ExpandableListView) findViewById(R.id.expandablelistview);         checkbox_quanxuan = (CheckBox) findViewById(R.id.checkbox_quanxuan);         textview = (TextView) findViewById(R.id.textview);         checkbox_quanxuan.setOnClickListener(this);         list = new ArrayList<>();         cartAdapter = new CartAdapter(list);         cartAdapter.setOnCartAdapterChangeListener(new CartAdapter.OnCartAdapterChangeListener() {
              @Override             public void onChildCheckedStatusChange(int groupPositon, int childPosition) {
                  startChange();             }             @Override             public void onChildNumberChange(int groupPositon, int childPosition) {
                  startChange();             }             @Override             public void onGroupCheckedStatusChange(int groupPositon) {
                  startChange();             }         });         expandablelistview.setAdapter(cartAdapter);         button_jiesuan = (Button) findViewById(R.id.button_jiesuan);         button_jiesuan.setOnClickListener(this);     }     void startChange() {
          i = cartAdapter.AllOfTheCount();         button_jiesuan.setText("数量:" + i);         anInt = cartAdapter.AllOfThePrice();         textview.setText("总价：" + anInt);         allChecked = cartAdapter.isAllChecked();         checkbox_quanxuan.setChecked(allChecked);     }     @Override     public void onClick(View v) {
          switch (v.getId()) {
              case R.id.checkbox_quanxuan:                 //做了四件事                 // 1、拿到旧状态、置反得到新状态                 // 2、修改所有商品数据的状态                 // 3、刷新适配 （修改view的状态）                 // 4、刷新底部状态栏                 boolean b = !allChecked;                 allChecked = b;                 cartAdapter.changeAllCheckBoxStatus(b);                 startChange();                 break;             case R.id.button_jiesuan:                 break;         }     } }