HttpUtils+MVP的Android购物车怎么实现

首先是依赖

compile 'com.google.code.gson:gson:2.6.2'
compile 'com.squareup.okhttp3:okhttp:3.3.0'
compile 'com.github.bumptech.glide:glide:3.7.0'

购物车的main布局

二级列表的父布局

二级列表的子布局

自定义加减类的布局

    
    
    


//一个灰边shape



    
    

mvp用到的接口

//view接口
public interface imainview {
    //显示数据
    void showshoppcart(list data);
    //显示总价
    void showsum(double price);
    //获取总价的集合
    list datap();
}

//model接口
public interface imodel {

    //获取购物车数据
    void getshoppdata(string surl, map map,shopplistener shopplistener);
    //计算总价
    void ji_price(list data,jipricelistener jipricelistener);
}

//presenter接口
public interface ipresenter {

    void showshoppcarttoview(imodel imodel, imainview imainview);

    void showsumtoview(imodel imodel, imainview imainview);
}

//获取购物车数据的监听接口
public interface shopplistener {
    void shoppsuccess(string json);
    void shopperror(string error);
}

//计算价格的监听接口
public interface jipricelistener {
    void jiprice(double price);
}

m层获取数据

public class shoppmodel implements imodel {

    @override
    public void getshoppdata(string surl, map map, final shopplistener shopplistener) {

        httputils httputils = httputils.gethttputils();
        httputils.okpost(surl,map);
        httputils.setokloadlistener(new httputils.okloadlistener() {
            @override
            public void okloadsuccess(string json) {
                shopplistener.shoppsuccess(json);
            }

            @override
            public void okloaderror(string error) {
                shopplistener.shopperror(error);
            }
        });
    }
    //计算价格
    @override
    public void ji_price(list data, jipricelistener jipricelistener) {

        double sum = 0;

        for (int i = 0; i < data.size(); i++) {

            list list = data.get(i).getlist();

            for (int j = 0; j < list.size(); j++) {

                boolean child_flag = list.get(j).ischild_flag();
                if (child_flag) {
                    double price = list.get(j).getprice()*list.get(j).getnum();
                    sum += price;
                }

            }
        }

        jipricelistener.jiprice(sum);
    }
}

p层一些逻辑运算

public class shopppresenter implements ipresenter {

    private static final string tag = "shopppresenter+++";
    @override
    public void showshoppcarttoview(imodel imodel, final imainview imainview) {

        map map = new hashmap<>();
        map.put("uid","10756");

        imodel.getshoppdata(apiutil.select_url, map, new shopplistener() {
            @override
            public void shoppsuccess(string json) {

                shoppbean shoppbean = new gson().fromjson(json, shoppbean.class);
                list data = shoppbean.getdata();

                imainview.showshoppcart(data);

            }

            @override
            public void shopperror(string error) {
                log.d(tag,"error:"+error);
            }
        });

    }

    @override
    public void showsumtoview(imodel imodel, final imainview imainview) {
        imodel.ji_price(imainview.datap(), new jipricelistener() {
            @override
            public void jiprice(double price) {
                imainview.showsum(price);
            }
        });
    }
}

v层展示数据

public class mainviewactivity extends appcompatactivity implements view.onclicklistener, imainview {

    private expandablelistview expan_able;
    private checkbox quan_cbox;
    private textview total;
    private textview qu_total;
    private shopppresenter shopppresenter;
    private list list_tem;
    private myexadapter myexadapter;

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);

        initviews();
        initdatas();
    }

    private void initdatas() {

        shopppresenter = new shopppresenter();
        shopppresenter.showshoppcarttoview(new shoppmodel(), this);
    }

    public void initviews() {
        expan_able = findviewbyid(r.id.expan_able);
        quan_cbox = findviewbyid(r.id.quan_cbox);
        total = findviewbyid(r.id.total);
        qu_total = findviewbyid(r.id.qu_total);

        quan_cbox.setonclicklistener(this);
        qu_total.setonclicklistener(this);
    }

    @override
    public void onclick(view v) {
        switch (v.getid()) {
            //全选，计算总价
            case r.id.quan_cbox:
                boolean quan_checked = quan_cbox.ischecked();

                for (int i = 0; i < list_tem.size(); i++) {
                    list_tem.get(i).setparent_flag(quan_checked);
                    list list = list_tem.get(i).getlist();

                    for (int j = 0; j < list.size(); j++) {
                        list.get(j).setchild_flag(quan_checked);
                    }
                }
                //刷新适配器
                myexadapter.notifydatasetchanged();
                //调用计算总价的方法
                shopppresenter shopppresenter = new shopppresenter();
                shopppresenter.showsumtoview(new shoppmodel(),this);
                break;

            case r.id.qu_total:
                toast.maketext(mainviewactivity.this,"去计算总价",toast.length_short).show();
                break;
        }
    }

    //展示购物车数据
    @override
    public void showshoppcart(final list data) {
        list_tem = data;

        myexadapter = new myexadapter(mainviewactivity.this, data, this);
        expan_able.setadapter(myexadapter);

        //展开expandablelistview
        int count = expan_able.getcount();
        for (int i = 0; i < count; i++) {
            expan_able.expandgroup(i);
        }

    }

    //显示总价
    @override
    public void showsum(double price) {
        total.settext("合计:" + price);
    }

    @override
    public list datap() {
        return list_tem;
    }

}

二级列表适配器

public class myexadapter extends baseexpandablelistadapter {

    private context context;
    private list data;
    private imainview imainview;

    public myexadapter(context context, list data, imainview imainview) {
        this.context = context;
        this.data = data;
        this.imainview = imainview;
    }

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

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

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

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

    @override
    public view getgroupview(final int groupposition, boolean isexpanded, view convertview, viewgroup parent) {

        final parentviewholder parentviewholder;
        if (convertview == null){
            parentviewholder = new parentviewholder();

            convertview = view.inflate(context, r.layout.item_parent,null);

            parentviewholder.parent_box = convertview.findviewbyid(r.id.parent_box);
            parentviewholder.parent_title = convertview.findviewbyid(r.id.parent_title);

            convertview.settag(parentviewholder);
        }else {
            parentviewholder = (parentviewholder) convertview.gettag();
        }

        //赋值
        parentviewholder.parent_title.settext(data.get(groupposition).getsellername());
        //父复选框赋状态值
        parentviewholder.parent_box.setchecked(data.get(groupposition).isparent_flag());
        //复选框的点击事件
        parentviewholder.parent_box.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                boolean ischecked = parentviewholder.parent_box.ischecked();
                //给自己父复选框赋值
                data.get(groupposition).setparent_flag(ischecked);
                //给子列表赋值
                list list = data.get(groupposition).getlist();

                for (int i = 0; i < list.size(); i++) {
                    shoppbean.databean.listbean listbean = list.get(i);
                    listbean.setchild_flag(ischecked);
                }

                notifydatasetchanged();

                //调用计算的方法
                shopppresenter shopppresenter = new shopppresenter();
                shopppresenter.showsumtoview(new shoppmodel(),imainview);


            }
        });
        return convertview;
    }

    @override
    public view getchildview(final int groupposition, final int childposition, boolean islastchild, view convertview, viewgroup parent) {
        final childviewholder childviewholder;
        if (convertview == null){
            childviewholder = new childviewholder();

           convertview = view.inflate(context,r.layout.item_child,null);

            childviewholder.child_box = convertview.findviewbyid(r.id.child_box);
            childviewholder.child_img = convertview.findviewbyid(r.id.child_img);
            childviewholder.child_title = convertview.findviewbyid(r.id.child_title);
            childviewholder.child_price = convertview.findviewbyid(r.id.child_price);
            childviewholder.child_delete = convertview.findviewbyid(r.id.child_delete);
            childviewholder.addsub = convertview.findviewbyid(r.id.addsub);
            convertview.settag(childviewholder);
        }else {
            childviewholder = (childviewholder) convertview.gettag();
        }

        //赋值
        final list list = data.get(groupposition).getlist();
        childviewholder.child_title.settext(list.get(childposition).gettitle());
        childviewholder.child_price.settext(list.get(childposition).getprice()+"");
        //子复选框赋状态值
        childviewholder.child_box.setchecked(list.get(childposition).ischild_flag());

        string[] split = list.get(childposition).getimages().split("\\|");
        glide.with(context).load(split[0]).into(childviewholder.child_img);


        childviewholder.addsub.setcount(list.get(childposition).getnum());
        childviewholder.addsub.setonaddclick(new addsubview.onaddsubclick() {
            @override
            public void onaddsubclick() {
                string count = childviewholder.addsub.getcount();
                list.get(childposition).setnum(integer.parseint(count));
                notifydatasetchanged();
                shopppresenter shopppresenter = new shopppresenter();
                shopppresenter.showsumtoview(new shoppmodel(),imainview);
            }
        });
        //子条目复选框的点击事件
        childviewholder.child_box.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                //获取当前条目状态
                boolean child_checked = childviewholder.child_box.ischecked();
                //设置当前子条目的状态
                list.get(childposition).setchild_flag(child_checked);
                //for循环当前的状态
                boolean ch_flag = true;//一个开关标记
                for (int i = 0; i 自定义加减类
public class addsubview extends linearlayout implements view.onclicklistener {

    private textview add;
    private textview sub;
    private edittext count;
    private onaddsubclick onaddclick;

    public addsubview(context context) {
        this(context,null);
    }

    public addsubview(context context, @nullable attributeset attrs) {
        this(context, attrs,0);
    }

    public addsubview(context context, @nullable attributeset attrs, int defstyleattr) {
        super(context, attrs, defstyleattr);

        view view = view.inflate(context, r.layout.add_layout, this);
        add = view.findviewbyid(r.id.add);
        sub = view.findviewbyid(r.id.sub);
        count = view.findviewbyid(r.id.count);

        add.setonclicklistener(this);
        sub.setonclicklistener(this);
    }


    @override
    public void onclick(view v) {

        switch (v.getid()){
            case r.id.add:
                add();
                onaddclick.onaddsubclick();
                break;
            case r.id.sub:
                sub();
                onaddclick.onaddsubclick();
                break;
        }

    }

    //添加
    public void add(){
        string s = count.gettext().tostring();
        int i = integer.parseint(s);
        i++;
        count.settext(i+"");


    }

    //减少
    public void sub(){
        string s = count.gettext().tostring();
        int i = integer.parseint(s);
        if (i>=1){
            i--;
            count.settext(i+"");
        }
    }
    //设置数量
    public void setcount(int cousize){
        count.settext(cousize+"");
    }
    //获取数量
    public string getcount(){
       return count.gettext().tostring();
    }

    public interface onaddsubclick{
      void onaddsubclick();
    }
    public void setonaddclick(onaddsubclick onaddclick){
        this.onaddclick = onaddclick;
    }
}
();>