購物車

佈局文件

Main 佈局

<?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=".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="價格"
            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="去結算"
            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佈局

<?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="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佈局

<?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="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_Title"
            android:maxLines="2"
            android:text="商品標題"
            />
        <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>

加減佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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>

加減

package com.example.gouwuche.ziview;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.gouwuche.R;

public class JiaJianView extends LinearLayout implements View.OnClickListener {
    private TextView mAdd;
    private TextView mDelete;
    private TextView mNumber;
    //商品數量
    private int mCount;

    public JiaJianView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.jiajian_item, this);
        initViews();
    }

    private void initViews() {
        mAdd = findViewById(R.id.add_tv);
        mDelete = findViewById(R.id.delete_tv);
        mNumber = findViewById(R.id.product_number_tv);
        mAdd.setOnClickListener(this);
        mDelete.setOnClickListener(this);
    }






    //先給初始值賦值
    public void setNumber(int number){
        this.mCount=number;
        mNumber.setText(number+"");
    }

    public interface OnCountChange{
        void setCount(int count);
    }
    private OnCountChange mOnCountChange;
    public void setOnChange(OnCountChange onCountChange){
        this.mOnCountChange=onCountChange;
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.delete_tv:
                if (mCount > 0) {
                    mCount--;
                    mNumber.setText(mCount + "");
                    if (mOnCountChange!=null){
                        mOnCountChange.setCount(mCount);
                    }
                }else {
                    Toast.makeText(getContext(), "商品已售空", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.add_tv:
                mCount++;
                mNumber.setText(mCount + "");
                if (mOnCountChange!=null){
                    mOnCountChange.setCount(mCount);
                }
                break;
        }
    }


}

購物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.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(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);
        //去掉自帶的小箭頭
        Expand_View.setGroupIndicator(null);
    }

    //刷新底部視圖

    private void flushBottomLayout(){
        boolean allGoods = myAdapter.isAllGoods();
        Quan_Box.setChecked(allGoods);
        int allGoodsNumber = myAdapter.getAllGoodsNumber();
        float allGoodsPrice = myAdapter.getAllGoodsPrice();
        Jia_Text.setText("價格："+allGoodsPrice);
        Zong_Text.setText("去結算："+"("+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();

        }
    }



}

工具類

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();
    }

}

適配器

package com.example.gouwuche.adapter;

import android.content.Context;
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.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 BaseExpandableListAdapter {

    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 Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public Object 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);
            //這裏傳入的必須是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.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(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_Title = convertView.findViewById(R.id.Child_Title);
            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_Title.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.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (adapterCallback != null) {
                    adapterCallback.setChildCheck(groupPosition, childPosition);
                }
            }
        });

        childHolder.Jia_Jian_View.setOnChange(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_Title;
        private TextView Child_Price;
        private JiaJianView Jia_Jian_View;
    }

    //點擊group的CheckBox全部選中
    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);
        }
    }


    //判斷小組是否選中
    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;
    }


    //點擊child給他進行賦值
    public void setChildChecked(int groupPosition, int childPosition, boolean isCheckBox) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        spusBean.setChildChecked(isCheckBox);

    }

    //查看當前這個商品有沒有被選中
    public boolean isChildChecked(int groupPosition, int childPosition) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        if (spusBean.isChildChecked()) {
            return true;
        }
        return false;
    }

    //給商品數量進行賦值
    public void setShangPingNumber(int groupPosition, int childPosition, int number) {
        MyData.DataBean.SpusBean spusBean = mList.get(groupPosition).getSpus().get(childPosition);
        spusBean.setPraise_num(number);
    }

    //因爲咱們底部視圖有個一全選和反選
    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;
    }

    //全選反選
    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);

            }
        }
    }

    //計算所有商品的價格
    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;
    }

    //計算所有商品的數量
    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);

        //點擊加減按鈕刷新
        void setNumber(int groupPosition, int childPosition, int number);
    }

    private AdapterCallback adapterCallback;

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


}