Android 购物车（精仿）可删可全选与反选

展示效果

Android 购物车（精仿）可删可全选与反选_第1张图片
主Activity中的方法

public class MainActivity extends Activity implements ShopcartExpandableListViewAdapter.CheckInterface, ShopcartExpandableListViewAdapter.ModifyCountInterface, OnClickListener{    private ExpandableListView exListView;    private CheckBox cb_check_all;    private TextView tv_total_price;    private TextView tv_delete;    private TextView tv_go_to_pay;    private Context context;    private double totalPrice = 0.00;// 购买的商品总价    private int totalCount = 0;// 购买的商品总数量    private ShopcartExpandableListViewAdapter selva;    private List groups = new ArrayList();// 组元素数据列表    private Map> children = new HashMap>();// 子元素数据列表    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        initView();        initEvents();    }    private void initView()    {        context = this;        virtualData();        exListView = (ExpandableListView) findViewById(R.id.exListView);        cb_check_all = (CheckBox) findViewById(R.id.all_chekbox);        tv_total_price = (TextView) findViewById(R.id.tv_total_price);        tv_delete = (TextView) findViewById(R.id.tv_delete);        tv_go_to_pay = (TextView) findViewById(R.id.tv_go_to_pay);    }    private void initEvents()    {        selva = new ShopcartExpandableListViewAdapter(groups, children, this);        selva.setCheckInterface(this);// 关键步骤1,设置复选框接口        selva.setModifyCountInterface(this);// 关键步骤2,设置数量增减接口        exListView.setAdapter(selva);        for (int i = 0; i < selva.getGroupCount(); i++)        {            exListView.expandGroup(i);// 关键步骤3,初始化时，将ExpandableListView以展开的方式呈现        }        cb_check_all.setOnClickListener(this);        tv_delete.setOnClickListener(this);        tv_go_to_pay.setOnClickListener(this);    }    /**     * 模拟数据
     * 遵循适配器的数据列表填充原则，组元素被放在一个List中，对应的组元素下辖的子元素被放在Map中，
     * 其键是组元素的Id(通常是一个唯一指定组元素身份的值)     */    private void virtualData()    {        for (int i = 0; i < 6; i++)        {            groups.add(new GroupInfo(i + "", "第八号当铺" + (i + 1) + "号店"));            List products = new ArrayList();            for (int j = 0; j <= i; j++)            {                products.add(new ProductInfo(j + "", "商品", "", groups.get(i).getName() + "的第" + (j + 1) + "个商品", 120.00 + i * j, 1));            }            children.put(groups.get(i).getId(), products);// 将组元素的一个唯一值，这里取Id，作为子元素List的Key        }    }    @Override    public void onClick(View v)    {        AlertDialog alert;        switch (v.getId())        {            case R.id.all_chekbox:                doCheckAll();                break;            case R.id.tv_go_to_pay:                if (totalCount == 0)                {                    Toast.makeText(context, "请选择要支付的商品", Toast.LENGTH_LONG).show();                    return;                }                alert = new AlertDialog.Builder(context).create();                alert.setTitle("操作提示");                alert.setMessage("总计:\n" + totalCount + "种商品\n" + totalPrice + "元");                alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener()                {                    @Override                    public void onClick(DialogInterface dialog, int which)                    {                        return;                    }                });                alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener()                {                    @Override                    public void onClick(DialogInterface dialog, int which)                    {                        return;                    }                });                alert.show();                break;            case R.id.tv_delete:                if (totalCount == 0)                {                    Toast.makeText(context, "请选择要移除的商品", Toast.LENGTH_LONG).show();                    return;                }                alert = new AlertDialog.Builder(context).create();                alert.setTitle("操作提示");                alert.setMessage("您确定要将这些商品从购物车中移除吗？");                alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener()                {                    @Override                    public void onClick(DialogInterface dialog, int which)                    {                        return;                    }                });                alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener()                {                    @Override                    public void onClick(DialogInterface dialog, int which)                    {                        doDelete();                    }                });                alert.show();                break;        }    }    /**     * 删除操作
     * 1.不要边遍历边删除，容易出现数组越界的情况
     * 2.现将要删除的对象放进相应的列表容器中，待遍历完后，以removeAll的方式进行删除     */    protected void doDelete()    {        List toBeDeleteGroups = new ArrayList();// 待删除的组元素列表        for (int i = 0; i < groups.size(); i++)        {            GroupInfo group = groups.get(i);            if (group.isChoosed())            {                toBeDeleteGroups.add(group);            }            List toBeDeleteProducts = new ArrayList();// 待删除的子元素列表            List childs = children.get(group.getId());            for (int j = 0; j < childs.size(); j++)            {                if (childs.get(j).isChoosed())                {                    toBeDeleteProducts.add(childs.get(j));                }            }            childs.removeAll(toBeDeleteProducts);        }        groups.removeAll(toBeDeleteGroups);        selva.notifyDataSetChanged();        calculate();    }    @Override    public void doIncrease(int groupPosition, int childPosition, View showCountView, boolean isChecked)    {        ProductInfo product = (ProductInfo) selva.getChild(groupPosition, childPosition);        int currentCount = product.getCount();        currentCount++;        product.setCount(currentCount);        ((TextView) showCountView).setText(currentCount + "");        selva.notifyDataSetChanged();        calculate();    }    @Override    public void doDecrease(int groupPosition, int childPosition, View showCountView, boolean isChecked)    {        ProductInfo product = (ProductInfo) selva.getChild(groupPosition, childPosition);        int currentCount = product.getCount();        if (currentCount == 1)            return;        currentCount--;        product.setCount(currentCount);        ((TextView) showCountView).setText(currentCount + "");        selva.notifyDataSetChanged();        calculate();    }    @Override    public void checkGroup(int groupPosition, boolean isChecked)    {        GroupInfo group = groups.get(groupPosition);        List childs = children.get(group.getId());        for (int i = 0; i < childs.size(); i++)        {            childs.get(i).setChoosed(isChecked);        }        if (isAllCheck())            cb_check_all.setChecked(true);        else            cb_check_all.setChecked(false);        selva.notifyDataSetChanged();        calculate();    }    @Override    public void checkChild(int groupPosition, int childPosiTion, boolean isChecked)    {        boolean allChildSameState = true;// 判断改组下面的所有子元素是否是同一种状态        GroupInfo group = groups.get(groupPosition);        List childs = children.get(group.getId());        for (int i = 0; i < childs.size(); i++)        {            if (childs.get(i).isChoosed() != isChecked)            {                allChildSameState = false;                break;            }        }        if (allChildSameState)        {            group.setChoosed(isChecked);// 如果所有子元素状态相同，那么对应的组元素被设为这种统一状态        } else        {            group.setChoosed(false);// 否则，组元素一律设置为未选中状态        }        if (isAllCheck())            cb_check_all.setChecked(true);        else            cb_check_all.setChecked(false);        selva.notifyDataSetChanged();        calculate();    }    private boolean isAllCheck()    {        for (GroupInfo group : groups)        {            if (!group.isChoosed())                return false;        }        return true;    }    /** 全选与反选 */    private void doCheckAll()    {        for (int i = 0; i < groups.size(); i++)        {            groups.get(i).setChoosed(cb_check_all.isChecked());            GroupInfo group = groups.get(i);            List childs = children.get(group.getId());            for (int j = 0; j < childs.size(); j++)            {                childs.get(j).setChoosed(cb_check_all.isChecked());            }        }        selva.notifyDataSetChanged();    }    /**     * 统计操作
     * 1.先清空全局计数器
     * 2.遍历所有子元素，只要是被选中状态的，就进行相关的计算操作
     * 3.给底部的textView进行数据填充     */    private void calculate()    {        totalCount = 0;        totalPrice = 0.00;        for (int i = 0; i < groups.size(); i++)        {            GroupInfo group = groups.get(i);            List childs = children.get(group.getId());            for (int j = 0; j < childs.size(); j++)            {                ProductInfo product = childs.get(j);                if (product.isChoosed())                {                    totalCount++;                    totalPrice += product.getPrice() * product.getCount();                }            }        }        tv_total_price.setText("￥" + totalPrice);        tv_go_to_pay.setText("去支付(" + totalCount + ")");    }}
主要代码点击这里吧（7smu）
展示效果

主Activity中的方法

谢谢观看，小编祝大家生活愉快！(多多关注小编，会有非常之多精彩分享哦！)

更多相关文章

随机推荐
