二级列表实现购物车的效果

转载的地址:http://blog.csdn.net/feifei20170707/article/details/78051516

效果如下



下面就是代码

Manactivity页面

public class MainActivity extends AppCompatActivity {

private ExpandableListView listview;
private MyAdpater adpater;
private TextView checked_shop;
private TextView price;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listview = (ExpandableListView) findViewById(R.id.listview);
adpater = new MyAdpater(this);
listview.setAdapter(adpater);
final CheckBox checkAll = (CheckBox) findViewById(R.id.checkAll);
price = (TextView) findViewById(R.id.price);
checked_shop = (TextView) findViewById(R.id.checked_shop);
checkAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//设置商品全部选中
adpater.checkAllShop(checkAll.isChecked());
//计算选中的价格和数量
String shopPrice = adpater.getShopPrice();
//判断商品是否全部选中
boolean b = adpater.selectAll();

String[] split = shopPrice.split(",");
price.setText(split[0]);
checked_shop.setText(split[1]);
checkAll.setChecked(b);
}
});
adpater.getAdapterData(new MyAdpater.AdapterData() {
@Override
public void Data(View v, String str, boolean b) {
String[] split = str.split(",");
price.setText(split[0]);
checked_shop.setText(split[1]);
checkAll.setChecked(b);
}
});

checkAll.setChecked(adpater.selectAll());
adpater.notifyDataSetChanged();
}
}

Adapter适配器页面

public class MyAdpater extends BaseExpandableListAdapter {
private Context context;
private String[] group;
private String[][] child;
private HashMap<Integer, Boolean> groupHashMap;
private List<HashMap<Integer, Boolean>> childList;
private List<List<Bean>> dataList;

public MyAdpater(Context context) {
this.context = context;
initData();
}

private void initData() {
group = new String[5];
child = new String[5][];
groupHashMap = new HashMap<>();
childList = new ArrayList<>();
dataList = new ArrayList<>();

for (int i = 0; i < 5; i++) {
group[i] = "商家" + i;
groupHashMap.put(i, false);

String[] strings = new String[3];
HashMap<Integer, Boolean> map = new HashMap<>();
ArrayList<Bean> been = new ArrayList<>();
for (int y = 0; y < 3; y++) {
strings[y] = "商家" + i + "商品" + y;

map.put(y, false);

Bean bean = new Bean("100", "1");
been.add(bean);
}

child[i] = strings;
childList.add(map);
dataList.add(been);
}
}

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

@Override
public int getChildrenCount(int groupPosition) {
return child[groupPosition].length;
}

@Override
public Object getGroup(int groupPosition) {
return group[groupPosition];
}

@Override
public Object getChild(int groupPosition, int childPosition) {
return child[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) {
GroupViewHolder holder = null;
if (convertView == null) {
convertView = View.inflate(context, R.layout.group_item, null);
holder = new GroupViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.group_tv);
holder.ck = (CheckBox) convertView.findViewById(R.id.group_ck);
convertView.setTag(holder);
} else {
holder = (GroupViewHolder) convertView.getTag();
}
holder.tv.setText(group[groupPosition]);
holder.ck.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
groupHashMap.put(groupPosition, !groupHashMap.get(groupPosition));
//设置二级列表的选中状态,根据一级列表的状态来改变
setChildCheckAll();
//计算选中的价格和数量
String shopPrice = getShopPrice();
//判断商品是否全部选中
boolean b = selectAll();
adapterData.Data(v, shopPrice, b);

}

});

holder.ck.setChecked(groupHashMap.get(groupPosition));
return convertView;
}

@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
ChildViewHolder holder = null;
if (convertView == null) {
convertView = View.inflate(context, R.layout.child_item, null);
holder = new ChildViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.child_tv);
holder.ck = (CheckBox) convertView.findViewById(R.id.child_ck);
holder.jianshao = (TextView) convertView.findViewById(R.id.jianshao);
holder.zengjia = (TextView) convertView.findViewById(R.id.zengjia);
holder.number = (TextView) convertView.findViewById(R.id.number);
convertView.setTag(holder);
} else {
holder = (ChildViewHolder) convertView.getTag();
}
holder.tv.setText(child[groupPosition][childPosition]);
holder.ck.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
HashMap<Integer, Boolean> hashMap = childList.get(groupPosition);
hashMap.put(childPosition, !hashMap.get(childPosition));
//判断二级列表是否全部选中
ChildisChecked(groupPosition);
//计算选中的价格和数量
String shopPrice = getShopPrice();
//判断商品是否全部选中
boolean b = selectAll();
adapterData.Data(v, shopPrice, b);
}
});
final ChildViewHolder finalHolder = holder;
holder.zengjia.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
List<Bean> been = dataList.get(groupPosition);
String num = finalHolder.number.getText().toString();
int i = Integer.parseInt(num);
++i;
been.get(childPosition).setNumber(i + "");
//计算选中的价格和数量
String shopPrice = getShopPrice();
//判断商品是否全部选中
boolean b = selectAll();
adapterData.Data(v, shopPrice, b);
notifyDataSetChanged();
}
});
holder.jianshao.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
List<Bean> been = dataList.get(groupPosition);
String num = finalHolder.number.getText().toString();
int i = Integer.parseInt(num);
if (i > 1) {
--i;
}
been.get(childPosition).setNumber(i + "");
//计算选中的价格和数量
String shopPrice = getShopPrice();
//判断商品是否全部选中
boolean b = selectAll();
adapterData.Data(v, shopPrice, b);
notifyDataSetChanged();
}
});

holder.number.setText(dataList.get(groupPosition).get(childPosition).getNumber().toString());

holder.ck.setChecked(childList.get(groupPosition).get(childPosition));
return convertView;
}

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

class GroupViewHolder {
TextView tv;
CheckBox ck;
}

class ChildViewHolder {
TextView tv;
CheckBox ck;
TextView jianshao;
TextView zengjia;
TextView number;
}

//设置二级列表的选中状态,根据一级列表的状态来改变
private void setChildCheckAll() {
for (int i = 0; i < childList.size(); i++) {
HashMap<Integer, Boolean> integerBooleanHashMap1 = childList.get(i);
Set<Map.Entry<Integer, Boolean>> entries = integerBooleanHashMap1.entrySet();
for (Map.Entry<Integer, Boolean> entry : entries) {
entry.setValue(groupHashMap.get(i));
}
}
notifyDataSetChanged();
}

//判断二级列表是否全部选中
private void ChildisChecked(int groupPosition) {
boolean ischecked = true;
HashMap<Integer, Boolean> hashMap = childList.get(groupPosition);
Set<Map.Entry<Integer, Boolean>> entries = hashMap.entrySet();
for (Map.Entry<Integer, Boolean> entry : entries) {
if (!entry.getValue()) {
ischecked = false;
break;
}
}
groupHashMap.put(groupPosition, ischecked);
notifyDataSetChanged();
}

//全选
public void checkAllShop(boolean checked) {
Set<Map.Entry<Integer, Boolean>> entries = groupHashMap.entrySet();
for (Map.Entry<Integer, Boolean> entry : entries) {
entry.setValue(checked);
}
//调用让二级列表全选的方法
setChildCheckAll();
notifyDataSetChanged();
}

//计算价格
public String getShopPrice() {
int price = 0;
int number = 0;
for (int y = 0; y < childList.size(); y++) {
HashMap<Integer, Boolean> integerBooleanHashMap1 = childList.get(y);
Set<Map.Entry<Integer, Boolean>> entries = integerBooleanHashMap1.entrySet();
for (Map.Entry<Integer, Boolean> entry : entries) {
if (entry.getValue()) {
Bean bean = dataList.get(y).get(entry.getKey());
price += Integer.parseInt(bean.getPrice()) * Integer.parseInt(bean.getNumber());
number += Integer.parseInt(bean.getNumber());
}
}
}
return price + "," + number;
}

//编辑一级和二级列表,如果全部选中,全选按钮也选中
public boolean selectAll() {
boolean isChecked = true;
for (int y = 0; y < childList.size(); y++) {
HashMap<Integer, Boolean> hashMap = childList.get(y);
Set<Map.Entry<Integer, Boolean>> entries = hashMap.entrySet();
for (Map.Entry<Integer, Boolean> entry : entries) {
if (!entry.getValue()) {
isChecked = false;
break;
}
}
}
return isChecked;
}

private AdapterData adapterData;

public interface AdapterData {
void Data(View v, String str, boolean b);

}

public void getAdapterData(AdapterData adapterData) {
this.adapterData = adapterData;
}
}

保存数据和价格的JavaBean

public class Bean {
private String price;
private String number;

public Bean(String price, String number) {
this.price = price;
this.number = number;
}

public String getPrice() {
return price;
}

public void setPrice(String price) {
this.price = price;
}

public String getNumber() {
return number;
}

public void setNumber(String number) {
this.number = number;
}
}

MainActivity页面

<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">

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

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp">

<CheckBox
android:id="@+id/checkAll"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_marginLeft="15dp"
android:drawablePadding="5dp"
android:text="全选"
android:textColor="#6b6868"
android:textSize="18sp" />

<TextView
android:id="@+id/price"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/checkAll"
android:gravity="center"
android:text="合计:￥0.00"
android:textColor="#000000"
android:textSize="18sp" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:background="#ff0000">

<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#ff0000"
android:gravity="center"
android:paddingLeft="30dp"
android:text="去结算"
android:textColor="#ffffff"
android:textSize="22sp" />

<TextView
android:id="@+id/checked_shop"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#ff0000"
android:gravity="center"
android:paddingRight="30dp"
android:text="(0)"
android:textColor="#ffffff"
android:textSize="13sp" />
</LinearLayout>

</RelativeLayout>

</LinearLayout>

Group_item页面

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

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">

<CheckBox
android:id="@+id/child_ck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp" />

<TextView
android:id="@+id/child_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="10dp">

<TextView
android:id="@+id/danjia"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="200dp"
android:text="100元"
android:textColor="#ff0000" />

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

<TextView
android:id="@+id/jianshao"
android:layout_width="20dp"
android:layout_height="30dp"
android:gravity="center"
android:text="-"
android:textSize="20sp"
android:textStyle="bold" />

<TextView
android:id="@+id/number"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:gravity="center"
android:text="1"
android:textSize="20sp"
android:textStyle="bold" />

<TextView
android:id="@+id/zengjia"
android:layout_width="20dp"
android:layout_height="30dp"
android:layout_marginRight="20dp"
android:gravity="center"
android:text="+"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
</RelativeLayout>

</LinearLayout>

child_item页面

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

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

<TextView
android:id="@+id/group_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>