购物车(ShoppingCar)

================main_activity===============================

package com.example.lenovo.shoppingcar.view;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.LinearLayout;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.Toast;import wangaimin.bwie.com.example.lenovo.shoppingcar.R;import wangaimin.bwie.com.example.lenovo.shoppingcar.model.bean.CartBean;import wangaimin.bwie.com.example.lenovo.shoppingcar.model.bean.CountPriceBean;import wangaimin.bwie.com.example.lenovo.shoppingcar.presenter.CartPresenter;import wangaimin.bwie.com.example.lenovo.shoppingcar.util.ApiUtil;import wangaimin.bwie.com.example.lenovo.shoppingcar.view.IView.IMainActivity;import wangaimin.bwie.com.example.lenovo.shoppingcar.view.adapter.MyAdapter;import wangaimin.bwie.com.example.lenovo.shoppingcar.view.custom.CartExpanableListview;public class CartActivity extends AppCompatActivity implements IMainActivity, View.OnClickListener{    private CartExpanableListview expanableListview;    private CartPresenter cartPresenter;    private CheckBox check_all;    private TextView text_total;    private TextView text_buy;    private CartBean cartBean;    private RelativeLayout relative_progress;    private MyAdapter myAdapter;    private LinearLayout linear_bottom;    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            if (msg.what == 0){                CountPriceBean countPriceBean = (CountPriceBean) msg.obj;                text_total.setText("合计:¥"+countPriceBean.getPriceString());                text_buy.setText("去结算("+countPriceBean.getCount()+")");            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.cart_activity_layout);        check_all = (CheckBox) findViewById(R.id.check_all);        text_total = (TextView) findViewById(R.id.text_total);        text_buy = (TextView) findViewById(R.id.text_buy);        expanableListview = (CartExpanableListview) findViewById(R.id.expanable_listview);        relative_progress = (RelativeLayout) findViewById(R.id.relative_progress);        linear_bottom = (LinearLayout) findViewById(R.id.linear_layout);        //去掉默认的指示器        expanableListview.setGroupIndicator(null);        cartPresenter = new CartPresenter(this);        //1.点击全选:选中/未选中...调用适配器中的方法...myAdapter.setIsCheckAll(true);来设置所有的一级和二级是否选中,计算        check_all.setOnClickListener(this);        text_buy.setOnClickListener(this);    }    @Override    protected void onResume() {        super.onResume();        relative_progress.setVisibility(View.VISIBLE);        //请求数据        cartPresenter.getCartData(ApiUtil.cartUrl);    }    @Override    public void getSuccessCartData(CartBean cartBean) {        relative_progress.setVisibility(View.GONE);        this.cartBean = cartBean;        if (cartBean != null){            //显示下面的            linear_bottom.setVisibility(View.VISIBLE);            //1.根据组中子条目是否选中,,,决定该组是否选中...初始化一下每一组中isGroupCheck这个数据            for (int i = 0;i<cartBean.getData().size();i++){                if (isAllChildInGroupSelected(i)){                    //更改i位置 组的选中状态                    cartBean.getData().get(i).setGroupChecked(true);                }            }            //2.根据每一个组是否选中的状态,,,初始化全选是否选中            check_all.setChecked(isAllGroupChecked());            //设置适配器            myAdapter = new MyAdapter(CartActivity.this, cartBean,handler,cartPresenter,relative_progress);            expanableListview.setAdapter(myAdapter);            //展开            for (int i= 0;i<cartBean.getData().size();i++){                expanableListview.expandGroup(i);            }            //3.根据子条目是否选中  初始化价格和数量            myAdapter.sendPriceAndCount();        }else {            //隐藏下面的全选.... 等            linear_bottom.setVisibility(View.GONE);            //显示去逛逛,,,添加购物车            Toast.makeText(CartActivity.this,"购物车为空,去逛逛",Toast.LENGTH_SHORT).show();        }    }    /**     * 所有的一级列表是否选中     */    private boolean isAllGroupChecked() {        for (int i =0;i<cartBean.getData().size();i++){            if (! cartBean.getData().get(i).isGroupChecked()){//代表一级列表有没选中的                return false;            }        }        return true;    }    /**     * 判断当前组里面所有的子条目是否选中     * @param groupPosition     * @return     */    private boolean isAllChildInGroupSelected(int groupPosition) {        for (int i= 0;i<cartBean.getData().get(groupPosition).getList().size();i++){            //只要有一个没选中就返回false            if (cartBean.getData().get(groupPosition).getList().get(i).getSelected() ==0){                return false;            }        }        return true;    }    @Override    public void onClick(View view) {        switch (view.getId()){            case R.id.check_all:                myAdapter.setAllChildState(check_all.isChecked());                break;            case R.id.text_buy://去结算...试一下创建订单                break;        }    }}

==================activity_main==================================

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout    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="wangaimin.bwie.com.example.lenovo.shoppingcar.view.CartActivity">    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"        android:text="Hello World!" app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" /></android.support.constraint.ConstraintLayout>