Android開發之MVP模式之仿淘寶實現購物車（二級列表實現）

1、首先導入依賴

implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.squareup.okhttp3:okhttp:3.12.0'
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.12.0'

2、寫入權限

    <uses-permission android:name="android.permission.INTERNET" />

3、來看一下包結構

4、接着看一下MainActivity.java

public class MainActivity extends AppCompatActivity implements CarAdapter.TotalPriceLister, DataCall<List<Shop>> {

    private TextView mSunPirce;
    private CheckBox mCheck_All;
    private CarAdapter carAdapter;
    private ExpandableListView mGoodsList;
    private CartPresenter cartPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 找到控件
        mSunPirce = findViewById(R.id.goods_sum_price);
        mCheck_All = findViewById(R.id.check_all);
        mGoodsList = findViewById(R.id.list_car);
		// 沒有箭頭
        mGoodsList.setGroupIndicator(null); 
        // 讓group不能被點擊
        mGoodsList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                return true;
            }
        });
        //點擊全選按鈕
        mCheck_All.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                carAdapter.checkAll(isChecked);//全部選中
            }
        });
        // 得到適配器對象
        carAdapter = new CarAdapter();
        carAdapter.setTotalPriceLister(this);// 回調總金額
        // 設置適配器
        mGoodsList.setAdapter(carAdapter);
        cartPresenter = new CartPresenter(this);// 調用P層
        cartPresenter.requestData();// 使用MVP模式
    }
    @Override
    public void totalprice(double totalprice) {
        // 設置總金額
        mSunPirce.setText(String.valueOf(totalprice));
    }
    @Override
    public void success(List<Shop> data) {
    	// 添加數據
        carAdapter.addAll(data);
        // 默認展開 所有數據
        int size = data.size();
        for (int i = 0; i < size; i++) {
            mGoodsList.expandGroup(i);// 展開
        }
        // 更新數據
        carAdapter.notifyDataSetChanged();
    }
    @Override
    public void fail(Result result) {
        cartPresenter.unBindCall();// 防治內存泄露
        Toast.makeText(this, "" + result.getMsg(), Toast.LENGTH_SHORT).show();
    }
}

5、看一下二級列表的適配器CarAdapter.java

public class CarAdapter extends BaseExpandableListAdapter {
    private List<Shop> mList = new ArrayList<>();
    private TotalPriceLister priceLister;
    //實例化自定義接口
    public void setTotalPriceLister(TotalPriceLister totalPriceLister) {
        this.priceLister = totalPriceLister;
    }
    // 點擊全選 則調用次方法
    public void checkAll(boolean is) {
        for (int i = 0; i < mList.size(); i++) {
            Shop shop = mList.get(i);
            shop.setCheck(is);// 設置
            for (int j = 0; j < shop.getList().size(); j++) {
                Goods goods = shop.getList().get(j);
                goods.setSelected(is?1:0);//設置選中狀態
            }
        }
        notifyDataSetChanged();// 刷新數據
        calculatePrice();//計算總價
    }
    // 自定義接口
    public interface TotalPriceLister{
        void totalprice(double totalprice);
    }
    public void addAll(List<Shop> list){
        if (list != null) {
            mList.addAll(list);// 添加數據
        }
    }
    @Override
    public int getGroupCount() {
        return mList.size();
    }
    @Override
    public int getChildrenCount(int groupPosition) {
        return mList.get(groupPosition).getList().size();
    }
    @Override
    public Object getGroup(int groupPosition) {
        return mList.get(groupPosition);
    }
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return mList.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 false;
    }
    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupHolder groupHolder = null;
        if (convertView == null) {
            convertView = View.inflate(parent.getContext(), R.layout.group_item, null);
            groupHolder = new GroupHolder();
            groupHolder.checkBox = convertView.findViewById(R.id.g_checkbox);
            convertView.setTag(groupHolder);
        } else {
            groupHolder = (GroupHolder) convertView.getTag();
        }
        final Shop shop = mList.get(groupPosition);// 得到此商鋪
        groupHolder.checkBox.setText(shop.getSellerName());// 設置商品的名字
        groupHolder.checkBox.setChecked(shop.isCheck());// 這是商鋪的選中狀態
        groupHolder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 防治點擊事件與選中發生衝突
                CheckBox checkBox= (CheckBox) v;
                shop.setCheck(checkBox.isChecked());// 設置商品的選中狀態
                List<Goods> goodsList = mList.get(groupPosition).getList();// 得到商品的信息
                for (int i = 0; i < goodsList.size(); i++) {
                    goodsList.get(i).setSelected(checkBox.isChecked() ? 1 : 0);// 設置是否選中
                }
                // 更新適配器
                notifyDataSetChanged();

                // 計算價格
                calculatePrice();
            }
        });
        return convertView;
    }
    /**
     * 計算總價格
     */
    private void calculatePrice() {
        double totalprice=0;
        for (int i = 0; i < mList.size(); i++) {
            Shop shop = mList.get(i);
            for (int j = 0; j < shop.getList().size(); j++) {
                Goods goods = shop.getList().get(j);
                if (goods.getSelected() == 1) {
                    // 是選中狀態的話則計算進去
                    totalprice = totalprice +goods.getNum()*goods.getPrice();
                }
            }
        }
        // 判斷
        if (priceLister != null) {
            priceLister.totalprice(totalprice);// 將值利用接口回調傳回Activity進行展示
        }
    }
    class GroupHolder {
        CheckBox checkBox;// 這是二級列表的第一級
    }
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildHolder childHolder=null;
        if (convertView == null) {
            childHolder = new ChildHolder();
            convertView = View.inflate(parent.getContext(),R.layout.child_item,null);
            childHolder.addSub= convertView.findViewById(R.id.add_sub);
            childHolder.check = convertView.findViewById(R.id.child_check);
            childHolder.image = convertView.findViewById(R.id.image_cc);
            childHolder.price = convertView.findViewById(R.id.text_price);
            childHolder.text = convertView.findViewById(R.id.text_ttt);
            convertView.setTag(childHolder);
        }else{
            childHolder= (ChildHolder) convertView.getTag();
        }
        // 得到單個商品
        final Goods goods = mList.get(groupPosition).getList().get(childPosition);
        childHolder.text.setText(goods.getTitle());
        childHolder.price.setText(goods.getPrice()+"");// 單價
        // 點擊選中，計算價格
        childHolder.check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 防治點擊事件與選中發生衝突
                CheckBox checkBox = (CheckBox) v;
                goods.setSelected(checkBox.isChecked()?1:0);//設置此商品是否選中
                // 計算價格
                calculatePrice();
            }
        });
        // 設置商品的複選框
        if (goods.getSelected()==0) {
            childHolder.check.setChecked(false);
        }else{
            childHolder.check.setChecked(true);
        }
        //設置圖片
        String images = goods.getImages();
        String[] split = images.split("\\|");
        if (split .length>0) {
           Glide.with(parent.getContext()).load(split[0].replace("https","http")).into(childHolder.image);
        }
        // 設置次商品的數量
        childHolder.addSub.setCount(goods.getNum());
        childHolder.addSub.setAddSubListener(new AddSubLayout.AddSubListener() {
            @Override
            public void addSub(int number) {
                goods.setNum(number);//設置數量
                calculatePrice();// 計算價格
            }
        });
        return convertView;
    }
    class ChildHolder {
        CheckBox check;
        TextView text;
        TextView price;
        ImageView image;
        AddSubLayout addSub;
    }
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }
}

6、BaseAdapter.java

public abstract class BasePresenter {

    DataCall dataCall;
    public BasePresenter(DataCall dataCall){
        this.dataCall = dataCall;
    }
    Handler mHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {

            Result result = (Result) msg.obj;
            if (result.getCode()==0){
                dataCall.success(result.getData());
            }else{
                dataCall.fail(result);
            }
        }
    };
    public void requestData(final Object...args){
        new Thread(new Runnable() {
            @Override
            public void run() {
                Message message = mHandler.obtainMessage();
                message.obj = getData(args);
                mHandler.sendMessage(message);

            }
        }).start();
    }
    protected abstract Result getData(Object...args);
    public void unBindCall(){
        this.dataCall = null;//防治內存泄露
    }
}

7、看一下DataCall.java

public interface DataCall<T> {
	// 成功
    void success(T data);
	// 失敗
    void fail(Result result);
}

8、Model層

public class CartModel {

    private static Result result;

    public static Result goodsList() {
        // 可以調用okhttp  因接口容易崩潰直接將數據取了出來
//        String resultString = HttpUtils.get("http://www.zhaoapi.cn/product/getCarts?uid=71");
        String resultString = "{\"msg\":\"請求成功\",\"code\":\"0\",\"data\":[{\"list\":[],\"sellerName\":\"\",\"sellerid\":\"0\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:48:08\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":11,\"pid\":11,\"price\":8989.0,\"pscid\":1,\"selected\":0,\"sellerid\":4,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家4\",\"sellerid\":\"4\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-03T23:43:53\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":1,\"pid\":13,\"price\":465.0,\"pscid\":1,\"selected\":0,\"sellerid\":6,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家6\",\"sellerid\":\"6\"},{\"list\":[{\"bargainPrice\":11800.0,\"createtime\":\"2017-10-14T21:38:26\",\"detailUrl\":\"https:\\/\\/mitem.jd.hk\\/ware\\/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t6130\\/97\\/1370670410\\/180682\\/1109582a\\/593276b1Nd81fe723.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5815\\/178\\/2614671118\\/51656\\/7f52d137\\/593276c7N107b725a.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5878\\/60\\/2557817477\\/30873\\/4502b606\\/593276caN5a7d6357.jpg!q70.jpg\",\"num\":3,\"pid\":63,\"price\":10000.0,\"pscid\":40,\"selected\":0,\"sellerid\":7,\"subhead\":\"購買電腦辦公部分商品滿1元返火車票5元優惠券（返完即止）\",\"title\":\"全球購 新款Apple MacBook Pro 蘋果筆記本電腦 銀色VP2新13英寸Bar i5\\/8G\\/256G\"}],\"sellerName\":\"商家7\",\"sellerid\":\"7\"},{\"list\":[{\"bargainPrice\":399.0,\"createtime\":\"2017-10-03T23:53:28\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/1439822107.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5887\\/201\\/859509257\\/69994\\/6bde9bf6\\/59224c24Ne854e14c.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5641\\/233\\/853609022\\/57374\\/5c73d281\\/59224c24N3324d5f4.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5641\\/233\\/853609022\\/57374\\/5c73d281\\/59224c24N3324d5f4.jpg!q70.jpg\",\"num\":1,\"pid\":87,\"price\":888.0,\"pscid\":85,\"selected\":0,\"sellerid\":8,\"subhead\":\"滿2件，總價打6.50折\",\"title\":\"Gap男裝 休閒舒適簡約水洗五袋直筒長褲緊身牛仔褲941825 深灰色 33\\/32(175\\/84A)\"},{\"bargainPrice\":3455.0,\"createtime\":\"2017-10-03T23:53:28\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/12224420750.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9106\\/106\\/1785172479\\/537280\\/253bc0ab\\/59bf78a7N057e5ff7.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9106\\/106\\/1785172479\\/537280\\/253bc0ab\\/59bf78a7N057e5ff7.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8461\\/5\\/1492479653\\/68388\\/7255e013\\/59ba5e84N91091843.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8461\\/5\\/1492479653\\/68388\\/7255e013\\/59ba5e84N91091843.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8803\\/356\\/1478945529\\/489755\\/2a163ace\\/59ba5e84N7bb9a666.jpg!q70.jpg\",\"num\":2,\"pid\":52,\"price\":666.0,\"pscid\":39,\"selected\":0,\"sellerid\":8,\"subhead\":\"【現貨新品搶購】全面屏2.0震撼來襲，驍龍835處理器，四曲面陶瓷機\",\"title\":\"小米（MI） 小米MIX2 手機 黑色 全網通 (6GB+64GB)【標配版】\"}],\"sellerName\":\"商家8\",\"sellerid\":\"8\"},{\"list\":[{\"bargainPrice\":11800.0,\"createtime\":\"2017-10-14T21:48:08\",\"detailUrl\":\"https:\\/\\/mitem.jd.hk\\/ware\\/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t6130\\/97\\/1370670410\\/180682\\/1109582a\\/593276b1Nd81fe723.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5815\\/178\\/2614671118\\/51656\\/7f52d137\\/593276c7N107b725a.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5878\\/60\\/2557817477\\/30873\\/4502b606\\/593276caN5a7d6357.jpg!q70.jpg\",\"num\":3,\"pid\":65,\"price\":12000.0,\"pscid\":40,\"selected\":0,\"sellerid\":9,\"subhead\":\"購買電腦辦公部分商品滿1元返火車票5元優惠券（返完即止）\",\"title\":\"全球購 新款Apple MacBook Pro 蘋果筆記本電腦 銀色VP2新13英寸Bar i5\\/8G\\/256G\"},{\"bargainPrice\":2999.0,\"createtime\":\"2017-10-14T21:48:08\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/2385655.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t2068\\/298\\/2448145915\\/157953\\/7be197df\\/56d51a42Nd86f1c8e.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t2437\\/128\\/1687178395\\/117431\\/bcc190c1\\/56d3fcbaNb2963d21.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t2467\\/222\\/2263160610\\/95597\\/927b8a2f\\/56d3eafeNdecebeb6.jpg!q70.jpg\",\"num\":2,\"pid\":53,\"price\":777.0,\"pscid\":39,\"selected\":0,\"sellerid\":9,\"subhead\":\"Super AMOLED三星雙曲面2K 屏，支持無線充電！\",\"title\":\"三星 Galaxy S7 edge（G9350）4GB+32GB 鉑光金 移動聯通電信4G手機 雙卡雙待\"},{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:39:05\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":1,\"pid\":16,\"price\":199.0,\"pscid\":1,\"selected\":0,\"sellerid\":9,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家9\",\"sellerid\":\"9\"},{\"list\":[{\"bargainPrice\":11800.0,\"createtime\":\"2017-10-14T21:38:26\",\"detailUrl\":\"https:\\/\\/mitem.jd.hk\\/ware\\/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t6130\\/97\\/1370670410\\/180682\\/1109582a\\/593276b1Nd81fe723.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5698\\/110\\/2617517836\\/202970\\/c9388feb\\/593276b7Nbd94ef1f.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5815\\/178\\/2614671118\\/51656\\/7f52d137\\/593276c7N107b725a.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t5878\\/60\\/2557817477\\/30873\\/4502b606\\/593276caN5a7d6357.jpg!q70.jpg\",\"num\":3,\"pid\":66,\"price\":13000.0,\"pscid\":40,\"selected\":0,\"sellerid\":10,\"subhead\":\"購買電腦辦公部分商品滿1元返火車票5元優惠券（返完即止）\",\"title\":\"全球購 新款Apple MacBook Pro 蘋果筆記本電腦 銀色VP2新13英寸Bar i5\\/8G\\/256G\"},{\"bargainPrice\":159.0,\"createtime\":\"2017-10-14T21:49:15\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/5061723.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8716\\/197\\/1271594444\\/173291\\/2f40bb4f\\/59b743bcN8509428e.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8347\\/264\\/1286771527\\/92188\\/5cf5ec04\\/59b7420fN65378e9e.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7363\\/165\\/3000956253\\/190883\\/179a372\\/59b743bfNd0c79d93.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7399\\/112\\/2935531768\\/183594\\/b77c7d4a\\/59b7441aNc3d40133.jpg!q70.jpg\",\"num\":5,\"pid\":99,\"price\":2100.0,\"pscid\":112,\"selected\":0,\"sellerid\":10,\"subhead\":\"針織針織閃閃閃亮你的眼\",\"title\":\"維邇旎 2017秋冬新款長袖針織連衣裙韓版氣質中長款名媛包臀A字裙 zx179709 黑色 XL\"},{\"bargainPrice\":111.99,\"createtime\":\"2017-10-03T23:53:28\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":2,\"pid\":17,\"price\":299.0,\"pscid\":1,\"selected\":0,\"sellerid\":10,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家10\",\"sellerid\":\"10\"},{\"list\":[{\"bargainPrice\":159.0,\"createtime\":\"2017-10-14T21:49:15\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/5061723.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8716\\/197\\/1271594444\\/173291\\/2f40bb4f\\/59b743bcN8509428e.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t8347\\/264\\/1286771527\\/92188\\/5cf5ec04\\/59b7420fN65378e9e.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7363\\/165\\/3000956253\\/190883\\/179a372\\/59b743bfNd0c79d93.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7399\\/112\\/2935531768\\/183594\\/b77c7d4a\\/59b7441aNc3d40133.jpg!q70.jpg\",\"num\":1,\"pid\":100,\"price\":2200.0,\"pscid\":112,\"selected\":0,\"sellerid\":11,\"subhead\":\"針織針織閃閃閃亮你的眼\",\"title\":\"維邇旎 2017秋冬新款長袖針織連衣裙韓版氣質中長款名媛包臀A字裙 zx179709 黑色 XL\"},{\"bargainPrice\":22.9,\"createtime\":\"2017-10-14T21:38:26\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/2542855.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t1930\\/284\\/2865629620\\/390243\\/e3ade9c4\\/56f0a08fNbd3a1235.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t2137\\/336\\/2802996626\\/155915\\/e5e90d7a\\/56f0a09cN33e01bd0.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t1882\\/31\\/2772215910\\/389956\\/c8dbf370\\/56f0a0a2Na0c86ea6.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t2620\\/166\\/2703833710\\/312660\\/531aa913\\/57709035N33857877.jpg!q70.jpg\",\"num\":5,\"pid\":34,\"price\":9.0,\"pscid\":2,\"selected\":0,\"sellerid\":11,\"subhead\":\"三隻松鼠零食特惠，專區滿99減50，滿199減100，火速搶購》\",\"title\":\"三隻松鼠 堅果炒貨 零食奶油味 碧根果225g\\/袋\"},{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:48:08\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":2,\"pid\":18,\"price\":399.0,\"pscid\":1,\"selected\":0,\"sellerid\":11,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家11\",\"sellerid\":\"11\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:39:05\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":3,\"pid\":19,\"price\":499.0,\"pscid\":1,\"selected\":0,\"sellerid\":12,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家12\",\"sellerid\":\"12\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:39:05\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":3,\"pid\":1,\"price\":118.0,\"pscid\":1,\"selected\":0,\"sellerid\":17,\"subhead\":\"每個中秋都不能簡單，無論身在何處，你總需要一塊餅讓生活更圓滿，京東月餅讓愛更圓滿京東自營，閃電配送，更多驚喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋節月餅 老北京月餅禮盒655g\"}],\"sellerName\":\"商家17\",\"sellerid\":\"17\"}]}";

        try {
            Gson gson = new Gson();

            Type type = new TypeToken<Result<List<Shop>>>() {
            }.getType();

            result = gson.fromJson(resultString, type);
            return result;
        } catch (Exception e) {
        }
        return result;
    }
}

9、Presenter層

public class CartPresenter extends BasePresenter {

    public CartPresenter(DataCall dataCall) {
        super(dataCall);
    }
    @Override
    protected Result getData(Object... args) {
        Result result = CartModel.goodsList();//調用網絡請求獲取數據
        return result;
    }
}

10、看一下自定義的View(用於加減商品的數量)

public class AddSubLayout extends LinearLayout implements View.OnClickListener {

    private TextView jian;
    private TextView jia;
    private TextView num;
    private AddSubListener addSubListener;
    // 實例化接口的變量
    public void setAddSubListener(AddSubListener addSubListener) {
        this.addSubListener = addSubListener;
    }

    public AddSubLayout(Context context) {
        super(context);
        initView();
    }

    public AddSubLayout(Context context,   AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    public AddSubLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView();
    }

    private void initView() {
//        第三個參數寫成this
        View view = View.inflate(getContext(), R.layout.add_sub,this);
        jian = view.findViewById(R.id.add_jian);
        jia = view.findViewById(R.id.add_jia);
        num = view.findViewById(R.id.num);
        jia.setOnClickListener(this);
        jian.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        // 得到數量的值
        int number = Integer.parseInt(num.getText().toString());

        switch (v.getId()){
            case R.id.add_jia:
                number++;
                num.setText(number+"");
                break;
            case R.id.add_jian:
                if (number == 0) {
                    Toast.makeText(getContext(), "數量不可小於0", Toast.LENGTH_SHORT).show();
                    return;
                }
                number--;
                num.setText(number+"");
                break;
        }
        if (addSubListener!=null) {
            addSubListener.addSub(number);
        }

    }
    public void setCount(int count) {
        num.setText(count+"");
    }
    // 自定義接口
    public interface AddSubListener{
        void addSub(int number);
    }
}

11、看一下請求網絡的類（寫了日誌攔截器）

public class HttpUtils {
    public static String get(String urlString) {

        // 添加日誌攔截器
        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(20, TimeUnit.SECONDS)//連接超時
                .readTimeout(20, TimeUnit.SECONDS)//讀取超時
                .callTimeout(20, TimeUnit.SECONDS)//呼叫超時
                .addInterceptor(loggingInterceptor)// 日誌攔截器
                .build();

        Request request = new Request.Builder().url(urlString).get().build();

        try {
            Response response = okHttpClient.newCall(request).execute();
            return response.body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
    
     //okhttp使用單例模式
    private static OkHttpClient singleton;
    //非常有必要，要不此類還是可以被new，但是無法避免反射，好惡心
    private HttpUtils(){

    }
    public static OkHttpClient getInstance() {
        if (singleton == null)
        {
            synchronized (HttpUtils.class)
            {
                if (singleton == null)
                {
                    singleton = new OkHttpClient();
                }
            }
        }
        return singleton;
    }
    
 }

12、看一下主佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ExpandableListView
        android:id="@+id/list_car"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <CheckBox
            android:id="@+id/check_all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:text="全選" />
        <!--
        android:layout_centerVertical="true"
            表示在此佈局中(高)居中顯示
            -->
        <TextView
            android:id="@+id/goods_sum_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@+id/check_all"
            android:text="價格：" />
    </RelativeLayout>

</LinearLayout>

13、看一下自定義VIew的佈局

<?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">

    <TextView
        android:id="@+id/add_jia"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/car_btn_bg"
        android:focusable="false"
        android:gravity="center"

        android:text="+"
        android:textSize="22sp" />

    <TextView
        android:id="@+id/num"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:focusable="false"
        android:gravity="center"
        android:text="1000"
        android:textSize="22sp" />

    <TextView
        android:id="@+id/add_jian"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/car_btn_bg"
        android:focusable="false"
        android:gravity="center"
        android:text="-"
        android:textSize="22sp" />
</LinearLayout>

14、二級列表的第一級的佈局

<?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="vertical">
    <CheckBox
        android:id="@+id/g_checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        android:focusable="false"/>
</LinearLayout>

15、二級列表的第二級的佈局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ddd"
    android:orientation="horizontal"
    android:padding="10dp">

    <CheckBox
        android:id="@+id/child_check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp" />

    <ImageView
        android:id="@+id/image_cc"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/child_check"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/text_ttt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="-3dp"
        android:layout_toRightOf="@+id/image_cc"
        android:padding="10dp"
        android:text="aa" />

    <TextView
        android:id="@+id/text_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text_ttt"

        android:layout_marginTop="10dp"
        android:layout_toRightOf="@+id/image_cc"
        android:padding="3dp"
        android:text="價格" />

    <此處是你自定義View的類名+包名
        android:id="@+id/add_sub"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="20dp"
        android:layout_marginRight="20dp"></bawie.com.month_01_demo.core.AddSubLayout>
</RelativeLayout>

16、最後是自定義view的樣式

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="5dp"></corners>
    <stroke
        android:width="2dp"
        android:color="@android:color/holo_red_dark">
    </stroke>
</shape>

//////最後看一下我的bean類吧
返回結果
Result.java

public class Result<T> {
    int code;
    String msg;
    T data;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

// 商家
Shop.java

public class Shop {
    List<Goods> list;
    String sellerName;
    String sellerid;

    // 自己添加的 爲了判斷複選框是否選中
    boolean check;

    public void setCheck(boolean check) {
        this.check = check;
    }

    public boolean isCheck() {
        return check;
    }

    public List<Goods> getList() {
        return list;
    }

    public void setList(List<Goods> list) {
        this.list = list;
    }

    public String getSellerName() {
        return sellerName;
    }

    public void setSellerName(String sellerName) {
        this.sellerName = sellerName;
    }

    public String getSellerid() {
        return sellerid;
    }

    public void setSellerid(String sellerid) {
        this.sellerid = sellerid;
    }
}

// 商品
Goods.java

public class Goods  {

    private double bargainPrice;
    private String createtime;
    private String detailUrl;
    private String images;
    private int num;
    private int pid;
    private double price;
    private int pscid;
    private int selected;
    private int sellerid;
    private String subhead;
    private String title;

    // 自己添加的 接口裏沒有 爲了設置商品的數量
    private int count=1;

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

    public int getCount() {
        return count;
    }

    public double getBargainPrice() {
        return bargainPrice;
    }

    public void setBargainPrice(double bargainPrice) {
        this.bargainPrice = bargainPrice;
    }

    public String getCreatetime() {
        return createtime;
    }

    public void setCreatetime(String createtime) {
        this.createtime = createtime;
    }

    public String getDetailUrl() {
        return detailUrl;
    }

    public void setDetailUrl(String detailUrl) {
        this.detailUrl = detailUrl;
    }

    public String getImages() {
        return images;
    }

    public void setImages(String images) {
        this.images = images;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }

    public int getPid() {
        return pid;
    }

    public void setPid(int pid) {
        this.pid = pid;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getPscid() {
        return pscid;
    }

    public void setPscid(int pscid) {
        this.pscid = pscid;
    }

    public int getSelected() {
        return selected;
    }

    public void setSelected(int selected) {
        this.selected = selected;
    }

    public int getSellerid() {
        return sellerid;
    }

    public void setSellerid(int sellerid) {
        this.sellerid = sellerid;
    }

    public String getSubhead() {
        return subhead;
    }

    public void setSubhead(String subhead) {
        this.subhead = subhead;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

// 到了這裏應該就可以出效果了吧 ！！！！