商品详情界面点击跳转到购物车（二）购物车界面

来源：互联网发布：影集制作软件免费版编辑：程序博客网时间：2024/05/16 19:29

//布局文件

<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="com.example.gaochao.shopcartdemo1.ShopCartActivity">    <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="40dp">        <CheckBox            android:id="@+id/cb"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerVertical="true"            android:text="全选" />        <TextView            android:id="@+id/tvTotal"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerVertical="true"            android:layout_marginLeft="15dp"            android:layout_toRightOf="@id/cb"            android:text="合计:" />        <TextView            android:id="@+id/tvCount"            android:layout_width="100dp"            android:layout_height="match_parent"            android:layout_alignParentRight="true"            android:layout_centerVertical="true"            android:background="#ff0000"            android:gravity="center"            android:text="去结算(0)"            android:textColor="#ffffff" />    </RelativeLayout></LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <CheckBox        android:id="@+id/cbGroup"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/tvGroup"        android:layout_width="match_parent"        android:layout_height="40dp"        android:gravity="center_vertical" /></LinearLayout>

<LinearLayout    android:orientation="horizontal"    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"    android:layout_height="match_parent">    <CheckBox        android:id="@+id/cbChild"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <ImageView        android:id="@+id/iv"        android:layout_width="100dp"        android:layout_height="100dp" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_weight="1"        android:orientation="vertical">        <TextView            android:id="@+id/tvTitle"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <TextView            android:id="@+id/tvSubhead"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center_vertical"            android:orientation="horizontal">            <TextView                android:id="@+id/tvPrice"                android:layout_width="wrap_content"                android:layout_height="wrap_content" />            <ImageView                android:layout_marginLeft="10dp"                android:id="@+id/ivDel"                android:layout_width="25dp"                android:layout_height="25dp"                android:background="@drawable/iv_del" />            <TextView                android:id="@+id/tvNum"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:textSize="25sp"                android:layout_marginLeft="3dp"                android:layout_marginRight="3dp"                android:text="1"/>            <ImageView                android:id="@+id/ivAdd"                android:layout_width="25dp"                android:layout_height="25dp"                android:background="@drawable/iv_add" />        </LinearLayout>    </LinearLayout>    <Button        android:id="@+id/btDel"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="删除" /></LinearLayout>

//封装两个bean 购物车商品界面bean 提取总价和结算总价 ShopCarBean priceAndCount

ShopCartBeanPriceAndCount

//m层

public interface ShopCartModelListener {    void getCart(Map<String,String> params, OnNetListener<ShopCartBean> bean);}

public class ShopCartModel implements ShopCartModelListener {    private Handler handler = new Handler();    @Override    public void getCart(Map<String, String> params, final OnNetListener<ShopCartBean> onNetListener) {        OkHttpUtils.getOkHttpUtils().doPost(API.str2, params, new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                String string = response.body().string();                final ShopCartBean shopCartBean = new Gson().fromJson(string, ShopCartBean.class);                handler.post(new Runnable() {                    @Override                    public void run() {                        onNetListener.onSuccess(shopCartBean);                    }                });            }        });    }}

//p层

public class ShopCartPresenter {    private ShopCartViewListener shopCartViewListener;    private ShopCartModelListener shopCartModelListener;    public ShopCartPresenter(ShopCartViewListener shopCartViewListener) {        this.shopCartViewListener = shopCartViewListener;        shopCartModelListener = new ShopCartModel();    }    public void onDettach(){        shopCartViewListener=null;    }    public void getShaopCartData(){        Map<String,String> params = new HashMap<>();        params.put("uid","1234");        params.put("pid","71");        shopCartModelListener.getCart(params, new OnNetListener<ShopCartBean>() {            @Override            public void onSuccess(ShopCartBean shopCartBean) {                if (shopCartViewListener != null){                    List<ShopCartBean.DataBean> group = shopCartBean.getData();                    List<List<ShopCartBean.DataBean.ListBean>> child = new ArrayList<>();                    for (int i=0;i<group.size();i++){                        child.add(group.get(i).getList());                    }                    shopCartViewListener.show(group,child);                }            }            @Override            public void onFailure(Exception e) {            }        });    }}

//v层

public interface ShopCartViewListener {    void show(List<ShopCartBean.DataBean> group,List<List<ShopCartBean.DataBean.ListBean>> child);}

public class ShopCartActivity extends AppCompatActivity implements ShopCartViewListener {    private ShopCartPresenter getCartPresenter;    private ExpandableListView mElv;    /**     * 全选     */    private CheckBox mCb;    /**     * 合计:     */    private TextView mTvTotal;    /**     * 去结算(0)     */    private TextView mTvCount;    private ElcAdapter elvAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_shop_cart);        initView();        getCartPresenter = new ShopCartPresenter(this);        getCartPresenter.getShaopCartData();        mCb.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                elvAdapter.AllOrNone(mCb.isChecked());            }        });    }    @Override    protected void onDestroy() {        super.onDestroy();        getCartPresenter.onDettach();    }    @Override    public void show(List<ShopCartBean.DataBean> group, List<List<ShopCartBean.DataBean.ListBean>> child) {        elvAdapter = new ElcAdapter(this, group, child);        mElv.setGroupIndicator(null);        mElv.setAdapter(elvAdapter);        for (int i = 0; i < group.size(); i++) {            mElv.expandGroup(i);        }    }    private void initView() {        mElv = (ExpandableListView) findViewById(R.id.elv);        mCb = (CheckBox) findViewById(R.id.cb);        mTvTotal = (TextView) findViewById(R.id.tvTotal);        mTvCount = (TextView) findViewById(R.id.tvCount);    }    public void setPriceAndCount(PriceAndCount priceAndCount) {        mTvTotal.setText("合计：" + priceAndCount.getPrice());        mTvCount.setText("去结算(" + priceAndCount.getCount() + ")");    }    public void setAllChecked(boolean bool) {        mCb.setChecked(bool);    }}

//适配器

class ElcAdapter extends BaseExpandableListAdapter{    private Context context;    private List<ShopCartBean.DataBean> group;    private List<List<ShopCartBean.DataBean.ListBean>> child;    private final LayoutInflater inflater;    public ElcAdapter(Context context, List<ShopCartBean.DataBean> group, List<List<ShopCartBean.DataBean.ListBean>> child) {        this.context = context;        this.group = group;        this.child = child;        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) {            view = inflater.inflate(R.layout.group_item1, null);            holder = new GroupViewHolder();            holder.tv = view.findViewById(R.id.tvGroup);            holder.cbGroup = view.findViewById(R.id.cbGroup);            view.setTag(holder);        } else {            view = convertView;            holder = (GroupViewHolder) view.getTag();        }        final ShopCartBean.DataBean dataBean = group.get(groupPosition);        holder.tv.setText(dataBean.getSellerName());        holder.cbGroup.setChecked(dataBean.isChecked());        holder.cbGroup.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //需要改变三个checkbox的状态值                //1.一级列表的checkbox状态值                dataBean.setChecked(holder.cbGroup.isChecked());                //2.二级列表的checkbox状态值                setChildrenCb(groupPosition, holder.cbGroup.isChecked());                //3.全选的checkbox状态值                ((ShopCartActivity) context).setAllChecked(isAllGroupCbChecked());                //计算钱和数量并显示                setPriceAndCount();                //刷新界面                notifyDataSetChanged();            }        });        return view;    }    @Override    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, final View convertView, ViewGroup parent) {        View view;        final ChildViewHolder holder;        if (convertView == null) {            view = inflater.inflate(R.layout.child_item2, null);            holder = new ChildViewHolder();            holder.iv = view.findViewById(R.id.iv);            holder.tvTitle = view.findViewById(R.id.tvTitle);            holder.tvSubhead = view.findViewById(R.id.tvSubhead);            holder.tvPrice = view.findViewById(R.id.tvPrice);            holder.cbChild = view.findViewById(R.id.cbChild);            holder.btDel = view.findViewById(R.id.btDel);            holder.tvNum = view.findViewById(R.id.tvNum);            holder.ivDel = view.findViewById(R.id.ivDel);            holder.ivAdd = view.findViewById(R.id.ivAdd);            view.setTag(holder);        } else {            view = convertView;            holder = (ChildViewHolder) view.getTag();        }        final ShopCartBean.DataBean.ListBean listBean = child.get(groupPosition).get(childPosition);        String images = listBean.getImages();        Glide.with(context).load(images.split("\\|")[0]).into(holder.iv);        holder.tvTitle.setText(listBean.getTitle());        holder.cbChild.setChecked(child.get(groupPosition).get(childPosition).isChecked());        holder.tvSubhead.setText(listBean.getSubhead());        holder.tvPrice.setText(listBean.getPrice() + "元");        holder.tvNum.setText(listBean.getCount() + "");        //给checkbox设置点击事件        holder.cbChild.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //需要改变三个checkbox的状态值                //1.二级列表的checkbox状态值                listBean.setChecked(holder.cbChild.isChecked());                //2.一级列表的checkbox状态值                group.get(groupPosition).setChecked(isAllChildCbChecked(groupPosition));                //3.全选的checkbox状态值                ((ShopCartActivity) context).setAllChecked(isAllGroupCbChecked());                //计算钱和数量并显示                setPriceAndCount();                //刷新界面                notifyDataSetChanged();            }        });        holder.ivAdd.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //获取目前显示的值                int count = listBean.getCount();                count++;                //改变JavaBean里的状态值                listBean.setCount(count);                //计算钱和数量并显示                setPriceAndCount();                //刷新列表                notifyDataSetChanged();            }        });        holder.ivDel.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //获取目前显示的值                int count = listBean.getCount();                if (count <= 1) {                    count = 1;                } else {                    count--;                }                //改变JavaBean里的状态值                listBean.setCount(count);                //计算钱和数量并显示                setPriceAndCount();                //刷新列表                notifyDataSetChanged();            }        });        holder.btDel.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //其实就是删除集合                List<ShopCartBean.DataBean.ListBean> listBeans = child.get(groupPosition);                if (listBeans.size() > 0) {                    listBeans.remove(childPosition);                }                if (listBeans.size() == 0) {                    child.remove(groupPosition);                    group.remove(groupPosition);                }                //计算钱和数量并显示                setPriceAndCount();                //改变全选状态                ((ShopCartActivity) context).setAllChecked(isAllGroupCbChecked());                //刷新列表                notifyDataSetChanged();            }        });        return view;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return false;    }    class GroupViewHolder {        TextView tv;        CheckBox cbGroup;    }    class ChildViewHolder {        ImageView iv;        TextView tvTitle;        TextView tvSubhead;        TextView tvPrice;        CheckBox cbChild;        Button btDel;        TextView tvNum;        ImageView ivDel;        ImageView ivAdd;    }    /**     * 设置一级列表对应的二级列表checkbox状态     *     * @param groupPosition     * @param bool     */    private void setChildrenCb(int groupPosition, boolean bool) {        List<ShopCartBean.DataBean.ListBean> listBeans = child.get(groupPosition);        for (int i = 0; i < listBeans.size(); i++) {            listBeans.get(i).setChecked(bool);        }    }    /**     * 判断一级列表checkbox状态     *     * @return     */    private boolean isAllGroupCbChecked() {        if (group.size() == 0) {            return false;        }        for (int i = 0; i < group.size(); i++) {            if (!group.get(i).isChecked()) {                return false;            }        }        return true;    }    /**     * 判断二级列表checkbox状态     *     * @return     */    private boolean isAllChildCbChecked(int groupPosition) {        List<ShopCartBean.DataBean.ListBean> listBeans = child.get(groupPosition);        for (int i = 0; i < listBeans.size(); i++) {            if (!listBeans.get(i).isChecked()) {                return false;            }        }        return true;    }    /**     * 设置钱和数量     */    private void setPriceAndCount() {        ((ShopCartActivity) context).setPriceAndCount(compute());    }    /**     * 计算钱和数量     */    private PriceAndCount compute() {        double price = 0;        int count = 0;        for (int i = 0; i < group.size(); i++) {            List<ShopCartBean.DataBean.ListBean> listBeans = child.get(i);            for (int j = 0; j < listBeans.size(); j++) {                if (listBeans.get(j).isChecked()) {                    price += listBeans.get(j).getPrice() * listBeans.get(j).getCount();                    count += listBeans.get(j).getCount();                }            }        }        return new PriceAndCount(price, count);    }    /**     * 全选或者全不选     *     * @param bool     */    public void AllOrNone(boolean bool) {        for (int i = 0; i < group.size(); i++) {            group.get(i).setChecked(bool);            setChildrenCb(i, bool);        }        setPriceAndCount();        notifyDataSetChanged();    }}

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