RxJava+Retrofit+Mvp实现购物车

本文实例为大家分享了rxjava retrofit实现购物车展示的具体代码，供大家参考，具体内容如下

先给大家展示一下效果图

框架结构：

1.项目框架：mvp，图片加载用fresco，网络请求用okhttp+retrofit实现（自己封装，加单例模式），
2.完成购物车数据添加（如果接口无数据，可用接口工具添加数据），
3.自定义view实现加减按钮，每次点击加减，item中的总数及总价要做出相应的改变。
4.当数量为1时，点击减号，数量不变，吐司提示用户最小数量为1。
5.底部总数及总价为所有item项中的总价及总数，每个item中数量价格的更改，底部总价总数要与之联动
6.实现单选反选全选功能，首次进入默认全选，item未选中时总数及总价不计入底部数据，改变选中状态时，底部总数及总价能做出正确修改
7.点击删除按钮，删除item，底部总数及总价能做出正确修改，接口数据删除。

添加所需要的依赖和联网权限

在使用mvp模式前先分包

net包

api

serviceapi

成功的接口

retrofit的封装

bean包

详情页的bean类

加入购物车的bean

商品类

app

view层

先写两个接口

主页面布局

主页面

第二个页面布局

实现购物车的代码

eventbus包

设置一个数量和价格的类

eventbus

model

实现详情页model层的接口

实现详情页model

购物车的model

presenter层

详情页的p层

购物车的p层

adapter

public class myexpandableadapter extends baseexpandablelistadapter {

private list<cartbean.databean> groupdata;
private context context;
private list<list<cartbean.databean.listbean>> childlist;

public myexpandableadapter( list<cartbean.databean> groupdata, context context, list<list<cartbean.databean.listbean>> childlist) {
this.groupdata = groupdata;
this.context = context;
this.childlist = childlist;
}

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

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

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

@override
public object getchild(int groupposition, int childposition) {
return null;
}

@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(final int groupposition, boolean isexpanded, view convertview, viewgroup parent) {
final groupviewholder holder;
if (convertview == null) {
convertview = view.inflate(context, r.layout.group_item, null);
holder = new groupviewholder();
holder.tv_group = (textview) convertview.findviewbyid(r.id.tv_group);
holder.group_cb = (checkbox) convertview.findviewbyid(r.id.gx_group);

convertview.settag(holder);
} else {
holder = (groupviewholder) convertview.gettag();
}
final cartbean.databean databean = groupdata.get(groupposition);

string sellername = databean.getsellername();
holder.group_cb.setchecked(databean.ischeck());
//点击一级checkbox的状态
holder.group_cb.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
databean.setcheck(holder.group_cb.ischecked());
//改变所有孩子的状态
changechildstate(groupposition,holder.group_cb.ischecked());
eventbus.getdefault().post(js());
//通过判断一级的checkbox判断全选的状态
changemianqxstatus(checkgroupall());
notifydatasetchanged();
}
});

return convertview;
}

@override
public view getchildview(final int groupposition, final int childposition, boolean islastchild, view convertview, viewgroup parent) {
final childviewholder holder;
if (convertview == null) {
convertview = view.inflate(context, r.layout.child_item, null);
holder = new childviewholder();

holder.tv_title= (textview) convertview.findviewbyid(r.id.title);
holder.price= (textview) convertview.findviewbyid(r.id.price);
holder.child_cb= (checkbox) convertview.findviewbyid(r.id.gouxuan_child);
holder.add= (textview) convertview.findviewbyid(r.id.jia);
holder.del= (textview) convertview.findviewbyid(r.id.del);
holder.jian= (textview) convertview.findviewbyid(r.id.jian);
holder.sdv= (simpledraweeview) convertview.findviewbyid(r.id.title_img);
holder.tv_num= (textview) convertview.findviewbyid(r.id.tv_num);
holder.yanse= (textview) convertview.findviewbyid(r.id.yanse);
convertview.settag(holder);
} else {
holder = (childviewholder) convertview.gettag();
}
final cartbean.databean.listbean listbean = childlist.get(groupposition).get(childposition);
int price = (int) listbean.getprice();
holder.child_cb.setchecked(listbean.ischeck());
holder.tv_title.settext(title);
string subhead = listbean.getsubhead();
string substring = subhead.substring(1, 10)+".....";
holder.yanse.settext(substring);
string images = listbean.getimages();
string[] split = images.split("|");
string s = split[0];
uri uri=uri.parse(s);
holder.sdv.setimageuri(uri);
// listbean.setcou(integer.parseint(holder.tv_num.gettext().tostring()));
//给子条目的checkbox点击事件
holder.child_cb.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
listbean.setcheck(holder.child_cb.ischecked());

eventbus.getdefault().post(js());
//如果二级的checkbox选中，就让一级的checkbox勾选
if(holder.child_cb.ischecked()) {

  if (ischeckallchild(groupposition)) {
  //改变一级checkbox的状态
  changegroupstatus(groupposition,true);
  //通过判断一级的checkbox的状态来改变全选的状态
  changemianqxstatus(checkgroupall());

  }
}else{
  changegroupstatus(groupposition,false);
  changemianqxstatus(checkgroupall());
}
notifydatasetchanged();
}

});

//点击加加的功能
holder.add.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
int cou = listbean.getcou();
holder.tv_num.settext(++cou+"");
listbean.setcou(cou);
if(holder.child_cb.ischecked()){
  eventbus.getdefault().post(js());
}

}
});
//点击减减的功能
holder.jian.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
int cou = listbean.getcou();

if(cou==1) {
  toast.maketext(context, "最小数量为1", toast.length_short).show();
  return;}
holder.tv_num.settext(--cou+"");
listbean.setcou(cou);
if (holder.child_cb.ischecked()) {
  eventbus.getdefault().post(js());

}
}
});
//点击删除
holder.del.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
list<cartbean.databean.listbean> listbeen = childlist.get(groupposition);

cartbean.databean.listbean remove = listbeen.remove(childposition);
if(listbeen.size()==0){
  childlist.remove(childposition);
  groupdata.remove(groupposition);
}
eventbus.getdefault().post(js());
notifydatasetchanged();

}
});

return convertview;
}

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

class groupviewholder {
checkbox group_cb;
textview tv_group;
}

class childviewholder {
checkbox child_cb;
textview tv_title,price,yanse,tv_num;
textview del,add,jian;
simpledraweeview sdv;

}
/**
* 判断全部的二级是checkbox否选中
*
*/
private boolean ischeckallchild(int g){
list<cartbean.databean.listbean> listbeen = childlist.get(g);

for (int i = 0; i <listbeen.size() ; i++) {
cartbean.databean.listbean listbean = listbeen.get(i);

if(!listbean.ischeck()){
return false;
}
}
return true;
}

/**
* 计算数量和价格
* 通过遍历一级的得到二级的checkbox，如果是选择的选中状态的话，就统计它们的总计的数量和价格
*/
private countandprice js(){
int cou=0;
int jiage=0;
for (int i = 0; i <groupdata.size() ; i++) {
for (int j = 0; j <childlist.get(i).size() ; j++) {
cartbean.databean.listbean listbean = childlist.get(i).get(j);
if(listbean.ischeck()){
  cou+=listbean.getcou();
  jiage+=(int)listbean.getprice()*listbean.getcou();
}

}

}
countandprice countandprice = new countandprice();
countandprice.setcount(cou);
countandprice.setprice(jiage);
return countandprice;
}
/**
* 改变一级列表的状态
*/
private void changegroupstatus(int groupposition,boolean flag ){
cartbean.databean databean = groupdata.get(groupposition);

databean.setcheck(flag);
}
/**
* 改变全选的状态
*
*/
private void changemianqxstatus(boolean flag){
messgeevent messgeevent = new messgeevent();
messgeevent.setcheck(flag);
eventbus.getdefault().post(messgeevent);
}
/**
* 判断一级的是否全部选中
*/
private boolean checkgroupall(){
for (int i = 0; i < groupdata.size(); i++) {
if(!groupdata.get(i).ischeck()){
return false;
}
}
return true;
}
/**
* 改变所有孩子的状态
*/
private void changechildstate(int groupistion,boolean flag){
list<cartbean.databean.listbean> listbeen = childlist.get(groupistion);
for (int i = 0; i < listbeen.size(); i++) {
listbeen.get(i).setcheck(flag);
}
}
/**
* 改变全选的
*/
public void qx(boolean flag){
for (int i = 0; i < groupdata.size(); i++) {
changegroupstatus(i, flag);
changechildstate(i, flag);
}
eventbus.getdefault().post(js());
notifydatasetchanged();
}
}

group_item.xml

child_item.xml

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服务器之家。

原文链接：https://blog.csdn.net/Cyq_0927/article/details/79006812