Android怎么实现二级列表购物车功能
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具体内容如下
MainActivity:
package com.baway.twoshopcar; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.CheckBox; import android.widget.ExpandableListView; import android.widget.TextView; import org.greenrobot.eventbus.EventBus; import org.greenrobot.eventbus.Subscribe; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity implements View.OnClickListener { /** * 全选 */ private CheckBox mCbAll; /** * 22 */ private TextView mTotalPrice; /** * 22 */ private TextView mTotalNum; private ExpandableListView mElv; private ListgroupList = new ArrayList<>(); private List > childList = new ArrayList<>(); private MyAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EventBus.getDefault().register(this); initView(); initDate(); mElv.setGroupIndicator(null); adapter = new MyAdapter(this, groupList, childList); mElv.setAdapter(adapter); for (int i = 0; i
list = new ArrayList<>(); for (int j = 0; j < 2; j++) { ChildBean childBean = new ChildBean("商品" + i, 1 + i, false); list.add(childBean); } childList.add(list); } } private void initView() { mCbAll = (CheckBox) findViewById(R.id.cb_all); mCbAll.setOnClickListener(this); mTotalPrice = (TextView) findViewById(R.id.totalPrice); mTotalNum = (TextView) findViewById(R.id.totalNum); mElv = (ExpandableListView) findViewById(R.id.elv); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.cb_all: adapter.allChecked(mCbAll.isChecked()); break; } } }
MyAdapter适配器:
package com.baway.twoshopcar; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.CheckBox; import android.widget.TextView; import org.greenrobot.eventbus.EventBus; import java.util.List; /** * Created by 郑文杰 on 2017/10/24. */ public class MyAdapter extends BaseExpandableListAdapter { private Context context; private ListgroupList; private List > childList; private int count; private int sumMoney; public MyAdapter(Context context, List
groupList, List > childList) { this.context = context; this.groupList = groupList; this.childList = childList; } @Override public int getGroupCount() { return groupList.size(); } @Override public int getChildrenCount(int groupPosition) { return childList.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return groupList.get(groupPosition); } @Override public Object getChild(int groupPosition, int childPosition) { return childList.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(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { GroupViewHolder holder; if (convertView == null) { holder = new GroupViewHolder(); convertView = View.inflate(context, R.layout.groupitem, null); holder.cb = convertView.findViewById(R.id.cb); holder.tvName = convertView.findViewById(R.id.tvName); convertView.setTag(holder); } else { holder = (GroupViewHolder) convertView.getTag(); } //赋值 GroupBean groupBean = groupList.get(groupPosition); holder.cb.setChecked(groupBean.isChecked()); holder.tvName.setText(groupBean.getGroupName()); //给group设置点击事件 holder.cb.setOnClickListener(new GroupCbOnClickListener(groupPosition)); return convertView; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { ChildViewHolder holder; if (convertView == null) { holder = new ChildViewHolder(); convertView = View.inflate(context, R.layout.childitem, null); holder.cb = convertView.findViewById(R.id.cb); holder.tvName = convertView.findViewById(R.id.tvName); holder.tvPrice = convertView.findViewById(R.id.tvPrice); convertView.setTag(holder); } else { holder = (ChildViewHolder) convertView.getTag(); } //赋值 ChildBean childBean = childList.get(groupPosition).get(childPosition); holder.cb.setChecked(childBean.isChecked()); holder.tvName.setText(childBean.getChildName()); holder.tvPrice.setText(childBean.getPrice() + ""); //设置点击事件Child holder.cb.setOnClickListener(new ChildCbOnClickListener(groupPosition,childPosition)); return convertView; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } class GroupViewHolder { CheckBox cb; TextView tvName; } class ChildViewHolder { CheckBox cb; TextView tvName; TextView tvPrice; } class ChildCbOnClickListener implements View.OnClickListener { private int groupPosition; private int childPosition; public ChildCbOnClickListener(int groupPosition, int childPosition) { this.groupPosition = groupPosition; this.childPosition = childPosition; } @Override public void onClick(View v) { if (v instanceof CheckBox) { CheckBox cb = (CheckBox) v; List
childBeen = childList.get(groupPosition); ChildBean childBean = childBeen.get(childPosition); childBean.setChecked(cb.isChecked()); //计算选中的商品数,并发送到主界面进行显示 MCEvent mcEvent = new MCEvent(); mcEvent.setCount(totalCount()); mcEvent.setMoney(totalPrice()); EventBus.getDefault().post(mcEvent); //判断商家所有的商品的checkbox是否选中 if (isChildChecked(childBeen)) { groupList.get(groupPosition).setChecked(true); MsgEvent msgEvent = new MsgEvent(); msgEvent.setFlag(isGroupChecked()); EventBus.getDefault().post(msgEvent); notifyDataSetChanged(); } else { groupList.get(groupPosition).setChecked(false); MsgEvent msgEvent = new MsgEvent(); msgEvent.setFlag(false); msgEvent.setFlag(isGroupChecked()); EventBus.getDefault().post(msgEvent); notifyDataSetChanged(); } } } } /** * 判断所有商家的所有商品的checkbox是否都选中 * * @param childBean * @return */ private boolean isChildChecked(List childBean) { for (int i = 0; i < childBean.size(); i++) { ChildBean childBean1 = childBean.get(i); if (!childBean1.isChecked()) { return false; } } return true; } class GroupCbOnClickListener implements View.OnClickListener { private int groupPosition; public GroupCbOnClickListener(int groupPosition) { this.groupPosition = groupPosition; } @Override public void onClick(View v) { if (v instanceof CheckBox){ CheckBox cb= (CheckBox) v; //根据cb.isChecked()是否选中,给一级列的checkbox改变状态 groupList.get(groupPosition).setChecked(cb.isChecked()); List childBeenList = childList.get(groupPosition); for (ChildBean childBean : childBeenList){ childBean.setChecked(cb.isChecked()); } //计算选中的商品数和金额,并发送到主界面进行显示 MCEvent mcEvent = new MCEvent(); mcEvent.setCount(totalCount()); mcEvent.setMoney(totalPrice()); EventBus.getDefault().post(mcEvent); MsgEvent msgEvent = new MsgEvent(); msgEvent.setFlag(isGroupChecked()); EventBus.getDefault().post(msgEvent); notifyDataSetChanged(); } } } /** * 判断其他商家是否选中 * @return */ private boolean isGroupChecked() { for (GroupBean groupBean : groupList) { if (!groupBean.isChecked()){ return false; } } return true; } //主界面全选框选中状态 public void allChecked(boolean bool) { for (int i = 0; i < groupList.size(); i++) { groupList.get(i).setChecked(bool); for (int j = 0; j < childList.get(i).size(); j++) { childList.get(i).get(j).setChecked(bool); } } //计算选中的商品数,发送到主界面进行显示 MCEvent mcEvent = new MCEvent(); mcEvent.setCount(totalCount()); mcEvent.setMoney(totalPrice()); EventBus.getDefault().post(mcEvent); notifyDataSetChanged(); } /** * 计算商品总价格 * * @return */ private int totalPrice() { sumMoney = 0; for (int i = 0; i < groupList.size(); i++) { for (int j = 0; j < childList.get(i).size(); j++) { if (childList.get(i).get(j).isChecked()) { int price = childList.get(i).get(j).getPrice(); sumMoney += price; } } } return sumMoney; } /** * 计算商品的总数量 * * @return */ private int totalCount() { count = 0; for (int i = 0; i < groupList.size(); i++) { for (int j = 0; j < childList.get(i).size(); j++) { if (childList.get(i).get(j).isChecked()) { //遍历所有商品,只要是选中状态的,就加1 count++; } } } return count; } }
childBean:
package com.baway.twoshopcar; /** * Created by hhh on 2017/10/24. */ public class ChildBean { private String childName; private int price; private boolean checked; public ChildBean(String childName, int price, boolean checked) { this.childName = childName; this.price = price; this.checked = checked; } public String getChildName() { return childName; } public void setChildName(String childName) { this.childName = childName; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } }
groupBean:
package com.baway.twoshopcar; /** * Created by hhh on 2017/10/24. */ public class GroupBean { private boolean checked; private String groupName; public GroupBean(boolean checked, String groupName) { this.checked = checked; this.groupName = groupName; } public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } public String getGroupName() { return groupName; } public void setGroupName(String groupName) { this.groupName = groupName; } }
MCEVENT:
package com.baway.twoshopcar; /** * Created by hhhh on 2017/10/24. */ public class MCEvent { private int money; private int count; public int getMoney() { return money; } public void setMoney(int money) { this.money = money; } public int getCount() { return count; } public void setCount(int count) { this.count = count; } }
msgEvent:
package com.baway.twoshopcar; /** * Created by hhh on 2017/10/24. */ public class MsgEvent { private boolean flag; public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; } }
MainActivity布局文件:
childitem布局文件:
groupitem布局:
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