购物车

首先布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#990000ff"
        android:gravity="center"
        android:text="购物车"
        android:textColor="#ff3660"
        android:textSize="25sp" />

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

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="@color/antiquewhite"
        android:gravity="center_vertical">

        <CheckBox
            android:id="@+id/checkbox2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:focusable="false" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="50dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@+id/checkbox2"
            android:gravity="center_vertical"
            android:text="全选"
            android:textSize="20sp" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:text="合计 ：" />


            <TextView
                android:id="@+id/tv_price"
                android:layout_width="wrap_content"
                android:layout_height="50dp"
                android:layout_marginLeft="10dp"
                android:paddingRight="10dp"
                android:text="0"
                android:textColor="@android:color/holo_red_light" />


            <TextView
                android:id="@+id/tv_num"
                android:layout_width="wrap_content"
                android:layout_height="50dp"
                android:background="@android:color/holo_red_dark"
                android:gravity="center"
                android:padding="10dp"
                android:text="结算(0)"
                android:textColor="@android:color/white" />
        </LinearLayout>
    </RelativeLayout>
</LinearLayout>

然后是该fragment

public class ShopFragment extends Fragment implements IcartView {
    private String uid;
    @BindView(R.id.elv)
    ExpandableListView elv;
    @BindView(R.id.checkbox2)
    CheckBox checkbox2;
    @BindView(R.id.tv_price)
    TextView tvPrice;
    @BindView(R.id.tv_num)
    TextView tvNum;
    Unbinder unbinder;
    private MyAdapter myAdapter;
    private CartPresenter cartPresenter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

        View view = inflater.inflate(R.layout.fragment_shop, container, false);
        unbinder = ButterKnife.bind(this, view);
        EventBus.getDefault().register(this);
        //
        uid = (String) SharedPreferencesUtils.getParam(getActivity(), "uid", "");
        cartPresenter = new CartPresenter(this);
        if (!TextUtils.isEmpty(uid)) {
            cartPresenter.getData(uid);
        }

        checkbox2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myAdapter.changeAllListCbState(checkbox2.isChecked());
            }
        });
        return view;
    }

    @Override
    public Context context() {
        return getContext();
    }

    @Override
    public void onSuccess(ShopBean shopBean) {
        List<ShopBean.DataBean> data = shopBean.getData();
        List<List<ShopBean.DataBean.ListBean>> list = new ArrayList<List<ShopBean.DataBean.ListBean>>();
        for (int i = 0; i < data.size(); i++) {
            List<ShopBean.DataBean.ListBean> list1 = data.get(i).getList();
            list.add(list1);
        }
        myAdapter = new MyAdapter(getContext(), data, list);
        elv.setAdapter(myAdapter);
        elv.setGroupIndicator(null);
        //默认让其全部展开
        for (int i = 0; i < data.size(); i++) {
            elv.expandGroup(i);
        }
    }

    @Override
    public void onFaild(String error) {

    }

    @Override
    public void delCart(DeleteCartBean deleteCartBean) {
        if (deleteCartBean.getCode().equals("0")) {
            cartPresenter.getData(uid);
        }
    }

    @Subscribe
    public void onMessageEvent(MessageEvent event){
        checkbox2.setChecked(event.isChecked());
    }
    @Subscribe
    public void onMessageEvent(PriceAndCountEvent event){
        tvNum.setText("结算(" + event.getCount() + ")");
        tvPrice.setText(event.getPrice()+"");
    }

    //销毁方法
    @Override
    public void onDestroy() {
        super.onDestroy();
        //eventBus销毁
        EventBus.getDefault().unregister(this);

    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }
}

adapter

public class MyAdapter extends BaseExpandableListAdapter {
    Context context;
    List<ShopBean.DataBean> group;
    List<List<ShopBean.DataBean.ListBean>> child;
    private final LayoutInflater inflater;


    public MyAdapter(Context context, List<ShopBean.DataBean> data, List<List<ShopBean.DataBean.ListBean>> list) {
        this.group = data;
        this.child = list;
        this.context = context;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public int getGroupCount() {
        return group.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return child.get(groupPosition).size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return group.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return child.get(groupPosition).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) {
        View view;
        final GroupViewHolder holder;
        if (convertView == null) {
            holder = new GroupViewHolder();
            view = inflater.inflate(R.layout.group_item, null);
            holder.cbGroup = view.findViewById(R.id.seller_cb);
            holder.tv_number = view.findViewById(R.id.seller_name_tv);
            view.setTag(holder);
        } else {
            view = convertView;
            holder = (GroupViewHolder) view.getTag();
        }
        final ShopBean.DataBean dataBean = group.get(groupPosition);
        holder.cbGroup.setChecked(dataBean.isChecked());
        holder.tv_number.setText(dataBean.getSellerName());
        holder.cbGroup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dataBean.setChecked(holder.cbGroup.isChecked());
                changeChildCbState(groupPosition, holder.cbGroup.isChecked());
                EventBus.getDefault().post(compute());
                changeAllCbState(isAllGroupCbSelected());
                notifyDataSetChanged();
            }
        });
        return view;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        View view;
        final ChildViewHolder holder;
        if (convertView == null) {
            holder = new ChildViewHolder();
            view = inflater.inflate(R.layout.child_item, null);
            holder.cbChild = view.findViewById(R.id.cb_child);
            holder.tv_tel = view.findViewById(R.id.tv_tel);
            holder.tv_content = view.findViewById(R.id.my_image_view);
            holder.tv_time = view.findViewById(R.id.tv_time);
            holder.tv_del = view.findViewById(R.id.tv_del);
            holder.iv_add = view.findViewById(R.id.iv_add);
            holder.iv_del = view.findViewById(R.id.iv_del);
            holder.tv_price = view.findViewById(R.id.tv_pri);
            holder.tv_num = view.findViewById(R.id.tv_num);
            view.setTag(holder);
        } else {
            view = convertView;
            holder = (ChildViewHolder) view.getTag();
        }
        final ShopBean.DataBean.ListBean datasBean = child.get(groupPosition).get(childPosition);
        Uri uri = null;
        String[] split = datasBean.getImages().split("\\|");
        
        for (int i = 0; i <split.length ; i++) {
           uri= Uri.parse(split[i]);
        }
        holder.tv_content.setImageURI(uri);
        holder.cbChild.setChecked(datasBean.isChecked());
        holder.tv_tel.setText(datasBean.getTitle());
        //holder.tv_content.setText(datasBean.getSubhead());
        holder.tv_time.setText(datasBean.getCreatetime());
        holder.tv_price.setText("价格" + datasBean.getPrice());
        holder.tv_num.setText(datasBean.getNum() + "");
        //二级checkbox
        holder.cbChild.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //设置该条目对象里的checked属性值
                datasBean.setChecked(holder.cbChild.isChecked());
                PriceAndCountEvent priceAndCountEvent = compute();
                EventBus.getDefault().post(priceAndCountEvent);

                if (holder.cbChild.isChecked()) {
                    //当前checkbox是选中状态
                    if (isAllChildCbSelected(groupPosition)) {
                        changGroupCbState(groupPosition, true);
                        changeAllCbState(isAllGroupCbSelected());
                    }
                } else {
                    changGroupCbState(groupPosition, false);
                    changeAllCbState(isAllGroupCbSelected());
                }
                notifyDataSetChanged();
            }
        });

        //加号
        holder.iv_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num = datasBean.getNum();
                holder.tv_num.setText(++num + "");
                datasBean.setNum(num);
                if (holder.cbChild.isChecked()) {
                    PriceAndCountEvent priceAndCountEvent = compute();
                    EventBus.getDefault().post(priceAndCountEvent);
                }
            }
        });

        //减号
        holder.iv_del.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num = datasBean.getNum();
                if (num == 1) {
                    return;
                }
                holder.tv_num.setText(--num + "");
                datasBean.setNum(num);
                if (holder.cbChild.isChecked()) {
                    PriceAndCountEvent priceAndCountEvent = compute();
                    EventBus.getDefault().post(priceAndCountEvent);
                }
            }
        });

        //删除
        holder.tv_del.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                List<ShopBean.DataBean.ListBean> datasBeen = child.get(groupPosition);
                ShopBean.DataBean.ListBean remove = datasBeen.remove(childPosition);
                if (datasBeen.size() == 0) {
                    child.remove(groupPosition);
                    group.remove(groupPosition);
                }
                EventBus.getDefault().post(compute());
                notifyDataSetChanged();
            }
        });
        return view;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    class GroupViewHolder {
        CheckBox cbGroup;
        TextView tv_number;
    }

    class ChildViewHolder {
        CheckBox cbChild;
        TextView tv_tel;
        SimpleDraweeView tv_content;
        TextView tv_time;
        TextView tv_price;
        ImageView tv_del;
        ImageView iv_del;
        ImageView iv_add;
        TextView tv_num;
    }


    /**
     * 改变全选的状态
     *
     * @param flag
     */
    private void changeAllCbState(boolean flag) {
        MessageEvent messageEvent = new MessageEvent();
        messageEvent.setChecked(flag);
        EventBus.getDefault().post(messageEvent);
    }

    /**
     * 改变一级列表checkbox状态
     *
     * @param groupPosition
     */
    private void changGroupCbState(int groupPosition, boolean flag) {
        ShopBean.DataBean dataBean = group.get(groupPosition);
        dataBean.setChecked(flag);
    }


    /**
     * 改变二级列表checkbox状态
     *
     * @param groupPosition
     * @param flag
     */
    private void changeChildCbState(int groupPosition, boolean flag) {
        List<ShopBean.DataBean.ListBean> datasBeen = child.get(groupPosition);
        for (int i = 0; i < datasBeen.size(); i++) {
            ShopBean.DataBean.ListBean datasBean = datasBeen.get(i);
            datasBean.setChecked(flag);
        }
    }

    /**
     * 判断一级列表是否全部选中
     *
     * @return
     */
    private boolean isAllGroupCbSelected() {
        for (int i = 0; i < group.size(); i++) {
            ShopBean.DataBean dataBean = group.get(i);
            if (!dataBean.isChecked()) {
                return false;
            }
        }
        return true;
    }


    /**
     * 判断二级列表是否全部选中
     *
     * @param groupPosition
     * @return
     */
    private boolean isAllChildCbSelected(int groupPosition) {
        List<ShopBean.DataBean.ListBean> datasBeen = child.get(groupPosition);
        for (int i = 0; i < datasBeen.size(); i++) {
            ShopBean.DataBean.ListBean datasBean = datasBeen.get(i);
            if (!datasBean.isChecked()) {
                return false;
            }
        }
        return true;
    }


    /**
     * 计算列表中，选中的钱和数量
     */
    private PriceAndCountEvent compute() {
        int count = 0;
        int price = 0;
        for (int i = 0; i < child.size(); i++) {
            List<ShopBean.DataBean.ListBean> datasBeen = child.get(i);
            for (int j = 0; j < datasBeen.size(); j++) {
                ShopBean.DataBean.ListBean datasBean = datasBeen.get(j);
                if (datasBean.isChecked()) {
                    price += datasBean.getNum() * datasBean.getPrice();
                    count += datasBean.getNum();
                }
            }
        }
        PriceAndCountEvent priceAndCountEvent = new PriceAndCountEvent();
        priceAndCountEvent.setCount(count);
        priceAndCountEvent.setPrice(price);
        return priceAndCountEvent;
    }
    /**
     * 设置全选、反选
     *
     * @param flag
     */
    public void changeAllListCbState(boolean flag) {
        for (int i = 0; i < group.size(); i++) {
            changGroupCbState(i, flag);
            changeChildCbState(i, flag);
        }
        EventBus.getDefault().post(compute());
        notifyDataSetChanged();
    }
}