购物车

布局文件

Main 布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<RelativeLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
     ns:app=\"http://schemas.android.com/apk/res-auto\"
     ns:tools=\"http://schemas.android.com/tools\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    tools:context=\".MainActivity\">

    <RelativeLayout
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:layout_alignParentBottom=\"true\"
        android:id=\"@+id/Rl\"
        >

        <CheckBox
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:id=\"@+id/Quan_Box\"
            />

        <TextView
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:id=\"@+id/Jia_Text\"
            android:text=\"价格\"
            android:layout_centerVertical=\"true\"
            android:layout_centerHorizontal=\"true\"
            />
        <TextView
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:id=\"@+id/Zong_Text\"
           android:text=\"去结算\"
            android:layout_alignParentRight=\"true\"
            android:layout_centerVertical=\"true\"
            />
    </RelativeLayout>

    <ExpandableListView
        android:layout_width=\"match_parent\"
        android:layout_height=\"match_parent\"
        android:id=\"@+id/Expand_View\"
        android:layout_above=\"@+id/Rl\"
        ></ExpandableListView>

</RelativeLayout>

Group布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    android:orientation=\"horizontal\"
    >

    <CheckBox
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"
        android:id=\"@+id/Group_Box\"
        android:focusable=\"false\"
        />
    <TextView
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"
        android:id=\"@+id/Group_Text\"
        />


</LinearLayout>

child布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"120dp\"
    android:gravity=\"center_vertical\"
    android:orientation=\"horizontal\"
    >

    <CheckBox
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"
        android:id=\"@+id/Child_Box\"
        android:focusable=\"false\"
        />
      <ImageView
          android:layout_width=\"80dp\"
          android:layout_height=\"80dp\"
          android:id=\"@+id/Child_Image\"
          android:layout_marginLeft=\"20dp\"
          android:src=\"@mipmap/ic_launcher\"
          android:scaleType=\"centerCrop\"
          />

    <LinearLayout
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"

        android:layout_weight=\"1\"
        android:orientation=\"vertical\"
        >

        <TextView
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:id=\"@+id/Child_ \"
            android:maxLines=\"2\"
            android:text=\"商品标题\"
            />
        <TextView
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:id=\"@+id/Child_Price\"
            android:text=\"￥0.0\"
            android:layout_marginTop=\"10dp\"
            />

    </LinearLayout>

<com.example.gouwuche.ziview.JiaJianView
    android:layout_width=\"wrap_content\"
    android:layout_height=\"wrap_content\"
    android:id=\"@+id/Jia_Jian_View\"

    ></com.example.gouwuche.ziview.JiaJianView>

</LinearLayout>

加减布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:layout_width=\"wrap_content\"
    android:layout_height=\"30dp\"
    android:layout_gravity=\"center_vertical\"
    android:layout_marginLeft=\"10dp\"
    android:background=\"#99000000\"
    android:gravity=\"center_vertical\"
    android:padding=\"2dp\">

    <TextView
        android:id=\"@+id/delete_tv\"
        android:layout_width=\"10dp\"
        android:layout_height=\"match_parent\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
        android:text=\"-\"
        android:textSize=\"16sp\" />

    <TextView
        android:id=\"@+id/product_number_tv\"
        android:layout_width=\"wrap_content\"
        android:layout_height=\"match_parent\"
        android:layout_marginLeft=\"2dp\"
        android:layout_weight=\"1\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
        android:text=\"1\" />

    <TextView
        android:id=\"@+id/add_tv\"
        android:layout_width=\"10dp\"
        android:layout_height=\"match_parent\"
        android:layout_marginLeft=\"2dp\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
        android:text=\"+\"
        android:textSize=\"16sp\" />

</LinearLayout>

购物MainActivity

package com.example.gouwuche;

import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.example.gouwuche.adapter.MyAdapter;
import com.example.gouwuche.bean.MyData;
import com.example.gouwuche.utils.OkHttpUtils;
import com.google.gson.Gson;

import java.io.IOException;
import java.util.ArrayList;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private CheckBox Quan_Box;
    private TextView Jia_Text;
    private TextView Zong_Text;
    private RelativeLayout Rl;
    private ExpandableListView Expand_View;
private String mUrl=\"http://www.wanandroid.com/tools/mockapi/6523/restaurant-list\";
private ArrayList<MyData.DataBean> mList=new ArrayList<>();
    private MyAdapter myAdapter;
//    @SuppressLint(\"HandlerLeak\")
//    private Handler mHandler=new Handler(){
//        @Override
//        public void handleMessage(Message msg) {
//                String jsonStr= (String) msg.obj;
//                Gson gson=new Gson();
//              MyData myData=  gson.fromJson(jsonStr,MyData.class);
//            mList.addAll(myData.getData());
//            myAdapter.notifyDataSetChanged();
//
//        }
//    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

        myAdapter = new MyAdapter(mList,this);
        Expand_View.setAdapter(myAdapter);
      // getNetData();
        new MyTask().execute(mUrl);
        myAdapter.setCallback(new MyAdapter.AdapterCallback() {
            @Override
            public void setGroupCheck(int groupPosition) {
                boolean childAllCheck = myAdapter.isChildAllCheck(groupPosition);
                myAdapter.childAllCheck(groupPosition,!childAllCheck);
                myAdapter.notifyDataSetChanged();
               flushBottomLayout();

            }

            @Override
            public void setChildCheck(int groupPosition, int childPosition) {

                boolean childChecked = myAdapter.isChildChecked(groupPosition, childPosition);
                myAdapter.setChildChecked(groupPosition,childPosition,!childChecked);
                myAdapter.notifyDataSetChanged();
                flushBottomLayout();
            }

            @Override
            public void setNumber(int groupPosition, int childPosition, int number) {

                myAdapter.setShangPingNumber(groupPosition,childPosition,number);
               myAdapter.notifyDataSetChanged();
               flushBottomLayout();
            }
        });

        Quan_Box.set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                boolean allGoods = myAdapter.isAllGoods();
                myAdapter.setAllGoodsIsChecked(!allGoods);
                myAdapter.notifyDataSetChanged();
                flushBottomLayout();
            }
        });
    }

    private void initView() {
        Quan_Box = (CheckBox) findViewById(R.id.Quan_Box);
        Jia_Text = (TextView) findViewById(R.id.Jia_Text);
        Zong_Text = (TextView) findViewById(R.id.Zong_Text);
        Rl = (RelativeLayout) findViewById(R.id.Rl);
        Expand_View = (ExpandableListView) findViewById(R.id.Expand_View);
        //去掉自带的小箭头
        Expand_View.setGroupIndicator(null);
    }

    //刷新底部视图

    private void flushBottomLayout(){
        boolean allGoods = myAdapter.isAllGoods();
        Quan_Box.setChecked(allGoods);
        int allGoodsNumber = myAdapter.getAllGoodsNumber();
        float allGoodsPrice = myAdapter.getAllGoodsPrice();
        Jia_Text.setText(\"价格：\"+allGoodsPrice);
        Zong_Text.setText(\"去结算：\"+\"(\"+allGoodsNumber+\")\");

    }



//    private void getNetData(){
//
//
//        OkHttpClient okHttpClient=new OkHttpClient();
//        Request request=new Request.Builder().url(mUrl).build();
//        okHttpClient.newCall(request).enqueue(new Callback() {
//            @Override
//            public void onFailure(Call call, IOException e) {
//
//            }
//
//            @Override
//            public void onResponse(Call call, Response response) throws IOException {
//
//                mHandler.sendMessage(mHandler.obtainMessage(0,response.body().string()));
//            }
//        });
//
//
//
//    }





    class MyTask extends AsyncTask<String,Void,MyData>{
        @Override
        protected MyData doInBackground(String... strings) {
            try {
                String jsonStr = OkHttpUtils.getInstance().get(strings[0]);
                Gson gson=new Gson();
                MyData myData = gson.fromJson(jsonStr, MyData.class);
                return myData;
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(MyData myData) {
            super.onPostExecute(myData);
            mList.addAll(myData.getData());
            myAdapter.notifyDataSetChanged();

        }
    }



}

工具类

package com.example.gouwuche.utils;

import java.io.IOException;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class OkHttpUtils {



   private OkHttpClient okHttpClient;
    private OkHttpUtils(){
        okHttpClient=new OkHttpClient();
    }

    public static OkHttpUtils getInstance(){
       return okHttpHolder.utils;
    }

    static class okHttpHolder{
        public static final OkHttpUtils utils=new OkHttpUtils();
    }

    public String get(String url) throws IOException {
        Request request=new Request.Builder().url(url).build();
        Response execute = okHttpClient.newCall(request).execute();
        return execute.body().string();
    }

}

适配器

package com.example.gouwuche.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget. ExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.gouwuche.R;
import com.example.gouwuche.bean.MyData;
import com.example.gouwuche.ziview.JiaJianView;

import java.util.ArrayList;
import java.util.List;

public class MyAdapter extends  ExpandableListAdapter {

    private ArrayList<MyData.DataBean> mList;
    private Context mContext;

    public MyAdapter(ArrayList<MyData.DataBean> mList, Context mContext) {
        this.mList = mList;
        this.mContext = mContext;
    }

    @Override
    public int getGroupCount() {
        return mList.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return mList.get(groupPosition).getSpus().size();
    }

    @Override
    public   getGroup(int groupPosition) {
        return null;
    }

    @Override
    public   getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        GroupHolder groupHolder;
        if (convertView == null) {
            groupHolder = new GroupHolder();
            convertView = View.inflate(mContext, R.layout.group_item, null);
            groupHolder.Group_Box = convertView.findViewById(R.id.Group_Box);
            groupHolder.Group_Text = convertView.findViewById(R.id.Group_Text);
            //这里传入的必须是childHolder
            convertView.setTag(groupHolder);
        } else {
            groupHolder = (GroupHolder) convertView.getTag();
        }
        MyData.DataBean dataBean = mList.get(groupPosition);
        groupHolder.Group_Text.setText(dataBean.getName() + \"\");
        boolean childAllCheck = isChildAllCheck(groupPosition);
        groupHolder.Group_Box.setChecked(childAllCheck);
        groupHolder.Group_Box.set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                if (adapterCallback != null) {
                    adapterCallback.setGroupCheck(groupPosition);
                }
            }
        });

        return convertView;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildHolder childHolder;
        if (convertView == null) {
            childHolder = new ChildHolder();
            convertView = View.inflate(mContext, R.layout.child_item, null);
            childHolder.Child_Box = convertView.findViewById(R.id.Child_Box);
            childHolder.Child_Image = convertView.findViewById(R.id.Child_Image);
            childHolder.Child_  = convertView.findViewById(R.id.Child_ );
            childHolder.Child_Price = convertView.findViewById(R.id.Child_Price);
            childHolder.Jia_Jian_View = convertView.findViewById(R.id.Jia_Jian_View);
            convertView.setTag(childHolder);
        } else {
            childHolder = (ChildHolder) convertView.getTag();
        }
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        childHolder.Child_ .setText(spusBean.getName() + \"\");
        childHolder.Child_Price.setText(spusBean.getSkus().get(0).getPrice() + \"\");
        Glide.with(mContext).load(spusBean.getPic_url()).into(childHolder.Child_Image);
        childHolder.Child_Box.setChecked(spusBean.isChildChecked());
        childHolder.Jia_Jian_View.setNumber(spusBean.getPraise_num());
        childHolder.Child_Box.set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                if (adapterCallback != null) {
                    adapterCallback.setChildCheck(groupPosition, childPosition);
                }
            }
        });

        childHolder.Jia_Jian_View.set (new JiaJianView.OnCountChange() {
            @Override
            public void setCount(int count) {
                if (adapterCallback != null) {
                    adapterCallback.setNumber(groupPosition, childPosition, count);
                }
            }
        });

        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }

    class GroupHolder {
        private CheckBox Group_Box;
        private TextView Group_Text;
    }

    class ChildHolder {
        private CheckBox Child_Box;
        private ImageView Child_Image;
        private TextView Child_ ;
        private TextView Child_Price;
        private JiaJianView Jia_Jian_View;
    }

    //点击group的CheckBox全部选中
    public void childAllCheck(int groupPosition, boolean isCheck) {
        MyData.DataBean dataBean = mList.get(groupPosition);
        List<MyData.DataBean.SpusBean> spus = dataBean.getSpus();
        for (int i = 0; i < spus.size(); i++) {
            MyData.DataBean.SpusBean bean = spus.get(i);
            bean.setChildChecked(isCheck);
        }
    }


    //判断小组是否选中
    public boolean isChildAllCheck(int groupPosition) {
        boolean boo = true;
        MyData.DataBean dataBean = mList.get(groupPosition);
        List<MyData.DataBean.SpusBean> spus = dataBean.getSpus();
        for (int i = 0; i < spus.size(); i++) {
            MyData.DataBean.SpusBean bean = spus.get(i);
            if (!bean.isChildChecked()) {
                return false;
            }
        }
        return boo;
    }


    //点击child给他进行赋值
    public void setChildChecked(int groupPosition, int childPosition, boolean isCheckBox) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        spusBean.setChildChecked(isCheckBox);

    }

    //查看当前这个商品有没有被选中
    public boolean isChildChecked(int groupPosition, int childPosition) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        if (spusBean.isChildChecked()) {
            return true;
        }
        return false;
    }

    //给商品数量进行赋值
    public void setShangPingNumber(int groupPosition, int childPosition, int number) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        spusBean.setPraise_num(number);
    }

    //因为咱们底部视图有个一全选和反选
    public boolean isAllGoods() {

        boolean boo = true;
        for (int i = 0; i < mList.size(); i++) {
            MyData.DataBean dataBean = mList.get(i);
            for (int j = 0; j < dataBean.getSpus().size(); j++) {
                MyData.DataBean.SpusBean spusBean = dataBean.getSpus().get(j);
                if (!spusBean.isChildChecked()) {
                    boo = false;
                }

            }
        }
        return boo;
    }

    //全选反选
    public void setAllGoodsIsChecked(boolean isAllCheck) {
        for (int i = 0; i < mList.size(); i++) {
            MyData.DataBean dataBean = mList.get(i);
            for (int j = 0; j < dataBean.getSpus().size(); j++) {
                MyData.DataBean.SpusBean bean = dataBean.getSpus().get(j);
                bean.setChildChecked(isAllCheck);

            }
        }
    }

    //计算所有商品的价格
    public float getAllGoodsPrice() {
        float allPrice = 0;

        for (int i = 0; i < mList.size(); i++) {
            MyData.DataBean dataBean = mList.get(i);
            for (int j = 0; j < dataBean.getSpus().size(); j++) {
                MyData.DataBean.SpusBean spusBean = dataBean.getSpus().get(j);
                if (spusBean.isChildChecked()) {
                    allPrice += spusBean.getPraise_num() * Float.parseFloat(spusBean.getSkus().get(0).getPrice());
                }

            }
        }

        return allPrice;
    }

    //计算所有商品的数量
    public int getAllGoodsNumber() {
        int allNumber = 0;
        for (int i = 0; i < mList.size(); i++) {
            MyData.DataBean dataBean = mList.get(i);
            for (int j = 0; j < dataBean.getSpus().size(); j++) {
                MyData.DataBean.SpusBean spusBean = dataBean.getSpus().get(j);
                if (spusBean.isChildChecked()) {
                    allNumber = allNumber + spusBean.getPraise_num();
                }
            }
        }
        return allNumber;
    }


    public interface AdapterCallback {

        void setGroupCheck(int groupPosition);

        void setChildCheck(int groupPosition, int childPosition);

        //点击加减按钮刷新
        void setNumber(int groupPosition, int childPosition, int number);
    }

    private AdapterCallback adapterCallback;

    public void setCallback(AdapterCallback adapterCallback) {
        this.adapterCallback = adapterCallback;
    }


}