Android实现二级列表购物车功能

package com.baway.twoshopcar;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.checkbox;
import android.widget.expandablelistview;
import android.widget.textview;

import org.greenrobot.eventbus.eventbus;
import org.greenrobot.eventbus.subscribe;

import java.util.arraylist;
import java.util.list;

public class mainactivity extends appcompatactivity implements view.onclicklistener {

  /**
   * 全选
   */
  private checkbox mcball;
  /**
   * 22
   */
  private textview mtotalprice;
  /**
   * 22
   */
  private textview mtotalnum;
  private expandablelistview melv;

  private list<groupbean> grouplist = new arraylist<>();
  private list<list<childbean>> childlist = new arraylist<>();
  private myadapter adapter;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    eventbus.getdefault().register(this);
    initview();
    initdate();
    melv.setgroupindicator(null);
    adapter = new myadapter(this, grouplist, childlist);
    melv.setadapter(adapter);
    for (int i = 0; i <grouplist.size() ; i++) {
      melv.expandgroup(i);
    }


  }

  @subscribe
  public void moneycount(mcevent mcevent){
    int money = mcevent.getmoney();
    int count = mcevent.getcount();
    mtotalnum.settext(count+"");
    mtotalprice.settext(money+"");
  }
  @subscribe
  public void messageevent(msgevent msg) {
    mcball.setchecked(msg.isflag());
  }
  @override
  protected void ondestroy() {
    super.ondestroy();
    eventbus.getdefault().unregister(this);
  }

  private void initdate() {
    for (int i = 0; i < 3; i++) {
      groupbean groupbean = new groupbean(false, "商家" + i);
      grouplist.add(groupbean);
      list<childbean> list = new arraylist<>();
      for (int j = 0; j < 2; j++) {
        childbean childbean = new childbean("商品" + i, 1 + i, false);
        list.add(childbean);
      }
      childlist.add(list);
    }
  }

  private void initview() {
    mcball = (checkbox) findviewbyid(r.id.cb_all);
    mcball.setonclicklistener(this);
    mtotalprice = (textview) findviewbyid(r.id.totalprice);
    mtotalnum = (textview) findviewbyid(r.id.totalnum);
    melv = (expandablelistview) findviewbyid(r.id.elv);
  }

  @override
  public void onclick(view v) {
    switch (v.getid()) {
      case r.id.cb_all:
        adapter.allchecked(mcball.ischecked());
        break;
    }
  }
}

package com.baway.twoshopcar;

import android.content.context;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseexpandablelistadapter;
import android.widget.checkbox;
import android.widget.textview;

import org.greenrobot.eventbus.eventbus;

import java.util.list;

/**
 * created by 郑文杰 on 2017/10/24.
 */

public class myadapter extends baseexpandablelistadapter {

  private context context;
  private list<groupbean> grouplist;
  private list<list<childbean>> childlist;
  private int count;
  private int summoney;

  public myadapter(context context, list<groupbean> grouplist, list<list<childbean>> childlist) {
    this.context = context;
    this.grouplist = grouplist;
    this.childlist = childlist;
  }

  @override
  public int getgroupcount() {
    return grouplist.size();
  }

  @override
  public int getchildrencount(int groupposition) {
    return childlist.get(groupposition).size();
  }

  @override
  public object getgroup(int groupposition) {
    return grouplist.get(groupposition);
  }

  @override
  public object getchild(int groupposition, int childposition) {
    return childlist.get(groupposition).get(childposition);
  }

  @override
  public long getgroupid(int groupposition) {
    return groupposition;
  }

  @override
  public long getchildid(int groupposition, int childposition) {
    return childposition;
  }

  @override
  public boolean hasstableids() {
    return false;
  }

  @override
  public view getgroupview(int groupposition, boolean isexpanded, view convertview, viewgroup parent) {
    groupviewholder holder;
    if (convertview == null) {
      holder = new groupviewholder();
      convertview = view.inflate(context, r.layout.groupitem, null);
      holder.cb = convertview.findviewbyid(r.id.cb);
      holder.tvname = convertview.findviewbyid(r.id.tvname);
      convertview.settag(holder);
    } else {

      holder = (groupviewholder) convertview.gettag();
    }
    //赋值
    groupbean groupbean = grouplist.get(groupposition);
    holder.cb.setchecked(groupbean.ischecked());
    holder.tvname.settext(groupbean.getgroupname());
    //给group设置点击事件
    holder.cb.setonclicklistener(new groupcbonclicklistener(groupposition));

    return convertview;
  }

  @override
  public view getchildview(int groupposition, int childposition, boolean islastchild, view convertview, viewgroup parent) {
    childviewholder holder;
    if (convertview == null) {
      holder = new childviewholder();
      convertview = view.inflate(context, r.layout.childitem, null);
      holder.cb = convertview.findviewbyid(r.id.cb);
      holder.tvname = convertview.findviewbyid(r.id.tvname);
      holder.tvprice = convertview.findviewbyid(r.id.tvprice);
      convertview.settag(holder);
    } else {
      holder = (childviewholder) convertview.gettag();
    }
    //赋值
    childbean childbean = childlist.get(groupposition).get(childposition);
    holder.cb.setchecked(childbean.ischecked());
    holder.tvname.settext(childbean.getchildname());
    holder.tvprice.settext(childbean.getprice() + "");
    //设置点击事件child
    holder.cb.setonclicklistener(new childcbonclicklistener(groupposition,childposition));
    return convertview;
  }

  @override
  public boolean ischildselectable(int groupposition, int childposition) {
    return true;
  }

  class groupviewholder {
    checkbox cb;
    textview tvname;
  }

  class childviewholder {
    checkbox cb;
    textview tvname;
    textview tvprice;
  }

  class childcbonclicklistener implements view.onclicklistener {

    private int groupposition;
    private int childposition;

    public childcbonclicklistener(int groupposition, int childposition) {
      this.groupposition = groupposition;
      this.childposition = childposition;
    }

    @override
    public void onclick(view v) {
      if (v instanceof checkbox) {
        checkbox cb = (checkbox) v;
        list<childbean> childbeen = childlist.get(groupposition);
        childbean childbean = childbeen.get(childposition);
        childbean.setchecked(cb.ischecked());
        //计算选中的商品数，并发送到主界面进行显示
        mcevent mcevent = new mcevent();
        mcevent.setcount(totalcount());
        mcevent.setmoney(totalprice());
        eventbus.getdefault().post(mcevent);
        //判断商家所有的商品的checkbox是否选中
        if (ischildchecked(childbeen)) {
          grouplist.get(groupposition).setchecked(true);
          msgevent msgevent = new msgevent();
          msgevent.setflag(isgroupchecked());
          eventbus.getdefault().post(msgevent);
          notifydatasetchanged();

        } else {
          grouplist.get(groupposition).setchecked(false);
          msgevent msgevent = new msgevent();
          msgevent.setflag(false);
          msgevent.setflag(isgroupchecked());
          eventbus.getdefault().post(msgevent);
          notifydatasetchanged();
        }
      }
    }

  }
  /**
   * 判断所有商家的所有商品的checkbox是否都选中
   *
   * @param childbean
   * @return
   */
  private boolean ischildchecked(list<childbean> childbean) {

    for (int i = 0; i < childbean.size(); i++) {
      childbean childbean1 = childbean.get(i);
      if (!childbean1.ischecked()) {
        return false;
      }
    }
    return true;
  }


  class groupcbonclicklistener implements view.onclicklistener {

    private int groupposition;

    public groupcbonclicklistener(int groupposition) {
      this.groupposition = groupposition;
    }

    @override
    public void onclick(view v) {
      if (v instanceof checkbox){
        checkbox cb= (checkbox) v;
        //根据cb.ischecked()是否选中，给一级列的checkbox改变状态
        grouplist.get(groupposition).setchecked(cb.ischecked());
        list<childbean> childbeenlist = childlist.get(groupposition);
        for (childbean childbean : childbeenlist){
          childbean.setchecked(cb.ischecked());
        }
        //计算选中的商品数和金额，并发送到主界面进行显示
        mcevent mcevent = new mcevent();
        mcevent.setcount(totalcount());
        mcevent.setmoney(totalprice());
        eventbus.getdefault().post(mcevent);

        msgevent msgevent = new msgevent();
        msgevent.setflag(isgroupchecked());
        eventbus.getdefault().post(msgevent);
        notifydatasetchanged();
      }
    }
  }

  /**
   * 判断其他商家是否选中
   * @return
   */
  private boolean isgroupchecked() {
    for (groupbean groupbean : grouplist) {
      if (!groupbean.ischecked()){
        return false;
      }
    }
    return true;
  }


  //主界面全选框选中状态
  public void allchecked(boolean bool) {
    for (int i = 0; i < grouplist.size(); i++) {
      grouplist.get(i).setchecked(bool);
      for (int j = 0; j < childlist.get(i).size(); j++) {
        childlist.get(i).get(j).setchecked(bool);
      }
    }
    //计算选中的商品数，发送到主界面进行显示
    mcevent mcevent = new mcevent();
    mcevent.setcount(totalcount());
    mcevent.setmoney(totalprice());
    eventbus.getdefault().post(mcevent);
    notifydatasetchanged();

  }

  /**
   * 计算商品总价格
   *
   * @return
   */
  private int totalprice() {
    summoney = 0;
    for (int i = 0; i < grouplist.size(); i++) {
      for (int j = 0; j < childlist.get(i).size(); j++) {
        if (childlist.get(i).get(j).ischecked()) {
          int price = childlist.get(i).get(j).getprice();
          summoney += price;
        }
      }
    }
    return summoney;
  }

  /**
   * 计算商品的总数量
   *
   * @return
   */
  private int totalcount() {
    count = 0;
    for (int i = 0; i < grouplist.size(); i++) {
      for (int j = 0; j < childlist.get(i).size(); j++) {
        if (childlist.get(i).get(j).ischecked()) {
          //遍历所有商品，只要是选中状态的，就加1
          count++;
        }
      }
    }
    return count;
  }


}

package com.baway.twoshopcar;

/**
 * created by hhh on 2017/10/24.
 */

public class childbean {
  private string childname;
  private int price;
  private boolean checked;

  public childbean(string childname, int price, boolean checked) {
    this.childname = childname;
    this.price = price;
    this.checked = checked;
  }

  public string getchildname() {
    return childname;
  }

  public void setchildname(string childname) {
    this.childname = childname;
  }

  public int getprice() {
    return price;
  }

  public void setprice(int price) {
    this.price = price;
  }

  public boolean ischecked() {
    return checked;
  }

  public void setchecked(boolean checked) {
    this.checked = checked;
  }
}

package com.baway.twoshopcar;

/**
 * created by hhh on 2017/10/24.
 */

public class groupbean {

  private boolean checked;
  private string groupname;

  public groupbean(boolean checked, string groupname) {
    this.checked = checked;
    this.groupname = groupname;
  }

  public boolean ischecked() {
    return checked;
  }

  public void setchecked(boolean checked) {
    this.checked = checked;
  }

  public string getgroupname() {
    return groupname;
  }

  public void setgroupname(string groupname) {
    this.groupname = groupname;
  }
}

package com.baway.twoshopcar;

/**
 * created by hhhh on 2017/10/24.
 */

public class mcevent {
  private int money;
  private int count;

  public int getmoney() {
    return money;
  }

  public void setmoney(int money) {
    this.money = money;
  }

  public int getcount() {
    return count;
  }

  public void setcount(int count) {
    this.count = count;
  }
}

package com.baway.twoshopcar;

/**
 * created by hhh on 2017/10/24.
 */

public class msgevent {
  private boolean flag;

  public boolean isflag() {
    return flag;
  }

  public void setflag(boolean flag) {
    this.flag = flag;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.baway.twoshopcar.mainactivity">

  <linearlayout
    android:id="@+id/ll"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignparentbottom="true"
    android:orientation="horizontal">

    <checkbox
      android:id="@+id/cb_all"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:text="全选" />

    <textview
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_marginleft="20dp"
      android:gravity="center_vertical"
      android:text="合计:" />

    <textview
      android:id="@+id/totalprice"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_marginleft="10dp"
      android:gravity="center_vertical"
      android:text="22" />

    <textview
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_marginleft="30dp"
      android:gravity="center_vertical"
      android:text="数量" />

    <textview
      android:id="@+id/totalnum"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:layout_marginleft="10dp"
      android:gravity="center_vertical"
      android:text="22" />
  </linearlayout>

  <expandablelistview
    android:id="@+id/elv"
    android:layout_above="@id/ll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"></expandablelistview>

</relativelayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="40dp"
  android:background="#330000ff"
  android:paddingleft="20dp"
  android:gravity="center_vertical"
  android:orientation="horizontal">

  <checkbox
    android:id="@+id/cb"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

  <textview
    android:id="@+id/tvname"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginleft="5dp" />

  <textview
    android:id="@+id/tvprice"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginleft="60dp" />

</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="40dp"
 android:background="#330000ff"
 android:gravity="center_vertical"
 android:orientation="horizontal">

 <checkbox
  android:id="@+id/cb"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />

 <textview
  android:id="@+id/tvname"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginleft="5dp" />

</linearlayout>