购物车

/**
 *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
 *
 * 2.一级列表的点击事件:
 *      2.1改变当前一级选中的状态...dataBean.setChoosed(! dataBean.isChoosed());
 *      2.2根据当前一级的状态,改变该组里面二级列表的状态....changeChilState(groupPosition,dataBean.isChoosed());
 *      2.3通过判断所有的一级组是否选中,来决定是否全选选中:...changeAllState(isAllGroupChecked());
 *      2.4发送价格个数量:...sendPriceAndCount();
 *      2.5刷新适配器
 * 3.二级列表点击事件:
 *      3.1点击改变当前子条目状态:...listBean.setChildChoosed(! listBean.isChildChoosed());//相反
 *      3.2发送价钱和数量给界面显示....sendPriceAndCount();
 *      3.3如果当前子条目是选中状态
 *          3.3.1选中
 *              判断一下当前组中所有的子条目是否全部选中:...isAllChildSelected(groupPosition)
 *              如果全部选中改变一下当前组的状态:...changGroupState(groupPosition,true);...确定是否改变全选changeAllState(isAllGroupChecked());
 *          3.3.2未选中
 *              changGroupState(groupPosition,false);改变当前组false...是否全选changeAllState(isAllGroupChecked());
 */
public class MainActivity extends AppCompatActivity implements IMainActivity, View.OnClickListener {

    private CartExpanableListview expanableListview;
    private String cartUrl = "https://www.zhaoapi.cn/product/getCarts?uid=3690";
    private CartPresenter cartPresenter;
    private Gson gson;
    private MyAdapter myAdapter;
    private CheckBox check_all;
    private TextView text_total;
    private TextView text_buy;

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 0){//更改价钱和数量的消息
                CountPriceBean countPriceBean = (CountPriceBean) msg.obj;

                text_total.setText("合计:¥"+countPriceBean.getPrice());
                text_buy.setText("去计算("+countPriceBean.getCount()+")");

            }else if (msg.what == 1){//改变全选的状态
                boolean flag = (boolean) msg.obj;
                check_all.setChecked(flag);
            }
        }
    };
    private List<CartBean.DataBean> listGroup;
    private List<List<CartBean.DataBean.ListBean>> listChilds;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        check_all = findViewById(R.id.check_all);
        text_total = findViewById(R.id.text_total);
        text_buy = findViewById(R.id.text_buy);
        expanableListview = findViewById(R.id.expanable_listview);
        //去掉默认的指示器
        expanableListview.setGroupIndicator(null);

        cartPresenter = new CartPresenter(this);
        gson = new Gson();

        //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();

        //请求数据
        cartPresenter.getCartData(cartUrl);

    }

    @Override
    public void getSuccessCartData(String json) {
        Log.e("-----",json);
        if(json == null || "null".equals(json) || json==""){
            Toast.makeText(MainActivity.this,"购物车空,去逛逛",Toast.LENGTH_SHORT).show();
        }else {

            //解析数据
            CartBean cartBean = gson.fromJson(json, CartBean.class);

            //一个是一级标题的数据
            listGroup = cartBean.getData();

            //所有子条目的数据
            listChilds = new ArrayList<>();
            for (int i = 0; i< listGroup.size(); i++){
                listChilds.add(listGroup.get(i).getList());
            }

            //根据网路上是否选中的状态,决定当前组是否选中
            for (int i = 0;i<listGroup.size();i++){
                if (isAllChildInGroupSelected(i)){
                    listGroup.get(i).setGroupChecked(true);
                }
            }

            //所有的组是否选中,确定全选是否选中
            check_all.setChecked(isAllGroupChecked());

            //初始化一下价格和数量
            sendPriceAndCount();

            //设置适配器
            myAdapter = new MyAdapter(MainActivity.this, listGroup, listChilds,handler);
            expanableListview.setAdapter(myAdapter);

            //展开所有
            for (int i = 0; i< listGroup.size(); i++){
                expanableListview.expandGroup(i);
            }

        }


    }

    /**
     * 计算价格数量
     */
    private void sendPriceAndCount() {

        double price = 0;
        int count = 0;

        //通过判断二级列表是否勾选,,,,计算价格数量
        for (int i=0;i<listGroup.size();i++){
            for (int j = 0;j<listChilds.get(i).size();j++){
                if (listChilds.get(i).get(j).getSelected() == 1){
                    price += listChilds.get(i).get(j).getNum() * listChilds.get(i).get(j).getPrice();
                    count += listChilds.get(i).get(j).getNum();
                }
            }
        }

        CountPriceBean countPriceBean = new CountPriceBean(price, count);
        //传给activity进行显示
        Message msg = Message.obtain();
        msg.what = 0;
        msg.obj = countPriceBean;
        handler.sendMessage(msg);


    }

    /**
     * 所有的一级列表是否选中
     */
    private boolean isAllGroupChecked() {
        for (int i =0;i<listGroup.size();i++){
            if (! listGroup.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<listChilds.get(groupPosition).size();i++){
            //只要有一个没选中就返回false
            if (listChilds.get(groupPosition).get(i).getSelected() ==0){
                return false;
            }
        }

        return true;
    }


    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.check_all://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

                myAdapter.setIsCheckAll(check_all.isChecked());//适配器中的所有checkBox是否选中

                break;
            case R.id.text_buy:

                double price = 0;
                int count = 0;

                //通过判断二级列表是否勾选,,,,计算价格数量
                for (int i=0;i<listGroup.size();i++){
                    for (int j = 0;j<listChilds.get(i).size();j++){
                        if (listChilds.get(i).get(j).getSelected() == 1){
                            price += listChilds.get(i).get(j).getNum() * listChilds.get(i).get(j).getPrice();
                            count += listChilds.get(i).get(j).getNum();
                        }
                    }
                }

                CountPriceBean countPriceBean = new CountPriceBean(price, count);

                Intent intent = new Intent(MainActivity.this, QueRenOrderActivity.class);

                intent.putExtra("order",countPriceBean);

                startActivity(intent);



                break;
        }
    }

}