Android_Retrofit查询购物车

购物车是最近电商项目开发的重要模块之一.
例子:

import java.text.DecimalFormat;
//购物车的主页面,也是view层,它实现的mvp中的view接口来获取数据
public class MainActivity extends AppCompatActivity implements IView<ShopCarBean> {
    @BindView(R.id.tv_bianji)
    TextView tvBianji;
    @BindView(R.id.exlist)
    ExpandableListView exlist;
    @BindView(R.id.check_all)
    public CheckBox checkAll;
    @BindView(R.id.tv_zprce)
    TextView price;
    @BindView(R.id.tv_count)
    TextView counts;
    @BindView(R.id.btn_js)
    Button btnJs;
    //初始化一下购物车一级列表集合
    ArrayList<ShopGroupBean> groupBeen = new ArrayList<>();
    //初始化一下购物车一级列表集合
    ArrayList<ArrayList<ShopChildBean>> goods = new ArrayList<>();
    private MyShopAdapter adapter;
    private boolean flagedit = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        ShopCarPresenter presenter = new ShopCarPresenter(this);
        //传入uid,这里是死数据
        presenter.getShopData("2606");
        adapter = new MyShopAdapter(this, groupBeen, goods, this);
        exlist.setAdapter(adapter);
        for (int i = 0; i < adapter.getGroupCount(); i++) {
            exlist.expandGroup(i);
        }
        adapter.notifyDataSetChanged();
    }

    @OnClick({R.id.tv_bianji, R.id.check_all, R.id.btn_js})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.tv_bianji:
                String trim = tvBianji.getText().toString().trim();
                if (trim.equals("编辑")) {
                    tvBianji.setText("完成");
                } else {
                    tvBianji.setText("编辑");
                }
                for (List<ShopChildBean> i1 : goods) {
                    for (int r = 0; r < i1.size(); r++) {
                        i1.get(r).setBtn(flagedit);
                    }
                }
                flagedit = !flagedit;
                adapter.notifyDataSetChanged();
                break;
            case R.id.check_all:
                boolean checked = checkAll.isChecked();
                for (int i = 0; i < groupBeen.size(); i++) {
                    groupBeen.get(i).setGroupcheck(checked);
                }
                for (int q = 0; q < goods.size(); q++) {
                    ArrayList<ShopChildBean> goodsBeen = goods.get(q);
                    for (int j = 0; j < goodsBeen.size(); j++) {
                        goodsBeen.get(j).setGoodscheck(checked);
                    }
                }
                changesum(goods);
                adapter.notifyDataSetChanged();
                break;
            case R.id.btn_js:
                int index = 0;
                for (int q = 0; q < goods.size(); q++) {
                    ArrayList<ShopChildBean> goodsBeen = goods.get(q);
                    for (int j = 0; j < goodsBeen.size(); j++) {
                        boolean goodscheck = goodsBeen.get(j).isGoodscheck();
                        if (goodscheck) {
                            index++;
                        }
                    }
                }
                if (index == 0) {
                    Toast.makeText(this, "请选择商品，谢谢", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "钱就是另一回事了", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
    DecimalFormat df = new DecimalFormat("######0.00");


    @Override
    public void onSuccess(ShopCarBean shopCarBean) {
        if (shopCarBean != null) {
                List<ShopCarBean.DataBean> data = shopCarBean.getData();
                for (int i = 0; i < data.size(); i++) {
                    groupBeen.add(new ShopGroupBean(false, data.get(i).getSellerName(), data.get(i).getSellerid()));
                    List<ShopCarBean.DataBean.ListBean> list = data.get(i).getList();
                    ArrayList<ShopChildBean> goodsBeen = new ArrayList<>();
                    for (int j = 0; j < list.size(); j++) {
                        goodsBeen.add(new ShopChildBean(false, list.get(j).getBargainPrice(), list.get(j).getImages(), list.get(j).getTitle(), list.get(j).getSubhead(), list.get(j).getNum(), list.get(j).getPid()));
                    }
                    goods.add(goodsBeen);
                }
                for (int i = 0; i < adapter.getGroupCount(); i++) {
                    exlist.expandGroup(i);
                }
                adapter.notifyDataSetChanged();
            }
    }

    @Override
    public void onFiled(Throwable throwable) {
        Toast.makeText(this, "shibai", Toast.LENGTH_SHORT).show();
    }
    public void changesum(ArrayList<ArrayList<ShopChildBean>> childBeen) {
        int count = 0;
        double sum = 0;
        for (List<ShopChildBean> i1 : childBeen) {
            for (int r = 0; r < i1.size(); r++) {
                boolean childCb1 = i1.get(r).isGoodscheck();
                if (childCb1) {
                    double price = i1.get(r).getBargainPrice();
                    int num = i1.get(r).getNum();
                    sum += price * num;
                    count++;
                }
            }
        }
        price.setText("￥" + df.format(sum));
        counts.setText(count + "");
    }

    public void deleteShop(int pid) {
        Toast.makeText(this, "aadas", Toast.LENGTH_SHORT).show();
    }

}

布局

<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:orientation="vertical"
    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:padding="10dp"
        >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:text="购物车" />

        <TextView
            android:id="@+id/tv_bianji"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="编辑" />
    </RelativeLayout>

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

    </ExpandableListView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:orientation="horizontal"
        android:padding="10dp">

        <CheckBox
            android:id="@+id/check_all"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:text="全选"
            android:textSize="15dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="总价:"
            android:textSize="15dp" />

        <TextView
            android:id="@+id/tv_zprce"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="0"
            android:textSize="15dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="数量:"
            android:textSize="15dp" />

        <TextView
            android:id="@+id/tv_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:text="0"
            android:textSize="15dp" />

        <Button
            android:id="@+id/btn_js"
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:layout_gravity="right"
            android:background="#fc0109"
            android:text="结算"
            android:textSize="15dp" />
    </LinearLayout>


</LinearLayout>