完整版二级购物车

//自定义View

public class AddDelView extends LinearLayout {    private TextView num;    private OnItemClick onItemClick;    private TextView add;    private TextView del;    public interface OnItemClick {        public void onItemAddClick(int count);        public void onItemDelClick(int count);    }    public void setOnItemClick(OnItemClick onItemClick) {        this.onItemClick = onItemClick;    }    public AddDelView(Context context) {        this(context, null);    }    public AddDelView(final Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        LayoutInflater.from(context).inflate(R.layout.add_del_view, this);        add = findViewById(R.id.add);        del = findViewById(R.id.del);        num = findViewById(R.id.num);    }    public void setOnAddClickListener(OnClickListener onClickListener) {        add.setOnClickListener(onClickListener);    }    public void setOnDelClickListener(OnClickListener onClickListener) {        del.setOnClickListener(onClickListener);    }    public void setCount(String count) {        num.setText(count);    }    public String getCount(){        return num.getText().toString().trim();    }}

//childBean

public class ChildBean {    private String childName;    private boolean checked;    private float money;    private int count;    public ChildBean(String childName, boolean checked, float money, int count) {        this.childName = childName;        this.checked = checked;        this.money = money;        this.count = count;    }    public float getMoney() {        return money;    }    public void setMoney(float money) {        this.money = money;    }    public int getCount() {        return count;    }    public void setCount(int count) {        this.count = count;    }    public String getChildName() {        return childName;    }    public void setChildName(String childName) {        this.childName = childName;    }    public boolean isChecked() {        return checked;    }    public void setChecked(boolean checked) {        this.checked = checked;    }}

//GroupBean

public class GroupBean {    private String groupName;    private boolean checked;    public GroupBean() {    }    public GroupBean(String groupName, boolean checked) {        this.groupName = groupName;        this.checked = checked;    }    public String getGroupName() {        return groupName;    }    public void setGroupName(String groupName) {        this.groupName = groupName;    }    public boolean isChecked() {        return checked;    }    public void setChecked(boolean checked) {        this.checked = checked;    }}

//Main

public class MainActivity extends AppCompatActivity {    private List<GroupBean> groupList = new ArrayList<>();    private List<List<ChildBean>> childList = new ArrayList<>();    private ExpandableListView mElv;    /**     * 全选     */    private CheckBox mCbAll;    /**     * 合计：     */    private TextView mTvTotal;    private MyAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        EventBus.getDefault().register(this);        initView();        initData();        adapter = new MyAdapter(this,groupList,childList);        mElv.setGroupIndicator(null);        mElv.setAdapter(adapter);        for (int i = 0; i < groupList.size(); i++) {            mElv.expandGroup(i);        }        mCbAll.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                adapter.allChecked(mCbAll.isChecked());            }        });    }    @Override    protected void onDestroy() {        super.onDestroy();        EventBus.getDefault().unregister(this);    }    @Subscribe    public void messageCountEvent(MessageCounEvent msg){        mTvTotal.setText("总计："+msg.getCount()+"个  共"+msg.getMoney()+"元");    }    @Subscribe    public void messageEvent(MessageEvent msg){        mCbAll.setChecked(msg.isFlag());    }    private void initData() {        for (int i = 0; i < 3; i++) {            GroupBean groupBean = new GroupBean("商家" + i, false);            groupList.add(groupBean);            List<ChildBean> list = new ArrayList<>();            for (int j = 0; j < 2; j++) {                ChildBean childBean = new ChildBean("商品" + i, false, 12.0f, 1);                list.add(childBean);            }            childList.add(list);        }    }    private void initView() {        mElv = (ExpandableListView) findViewById(R.id.elv);        mCbAll = (CheckBox) findViewById(R.id.cbAll);        mTvTotal = (TextView) findViewById(R.id.tvTotal);    }}

//二级列表适配器

public class MyAdapter extends BaseExpandableListAdapter {    private Context context;    private List<GroupBean> groupList = new ArrayList<>();    private List<List<ChildBean>> childList = new ArrayList<>();    public MyAdapter(Context context, List<GroupBean> groupList, List<List<ChildBean>> 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) {        View view;        GroupViewHolder holder;        if (convertView == null) {            holder = new GroupViewHolder();            view = View.inflate(context, R.layout.item, null);            holder.cb = view.findViewById(cb);            holder.tv = view.findViewById(R.id.tvName);            view.setTag(holder);        } else {            view = convertView;            holder = (GroupViewHolder) view.getTag();        }        //赋值        GroupBean groupBean = groupList.get(groupPosition);        holder.cb.setChecked(groupBean.isChecked());        holder.tv.setText(groupBean.getGroupName());        //给group的checkbox设置点击事件        holder.cb.setOnClickListener(new GroupCbOnClickListener(groupPosition));        return view;    }    @Override    public View getChildView(final int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        View view;        final ChildViewHolder holder;        if (convertView == null) {            holder = new ChildViewHolder();            view = View.inflate(context, R.layout.childitem, null);            holder.cb = view.findViewById(cb);            holder.tv = view.findViewById(R.id.tvName);            holder.tvMoney = view.findViewById(R.id.tvPrice);            holder.adv = view.findViewById(R.id.adv);            view.setTag(holder);        } else {            view = convertView;            holder = (ChildViewHolder) view.getTag();        }        //赋值        final ChildBean childBean = childList.get(groupPosition).get(childPosition);        holder.cb.setChecked(childBean.isChecked());        holder.tv.setText(childBean.getChildName());        holder.tvMoney.setText(childBean.getMoney() + "");        holder.adv.setCount(childBean.getCount() + "");        holder.cb.setOnClickListener(new ChildCbOnClickListener(groupPosition, childPosition));        holder.adv.setOnAddClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String countStr = holder.adv.getCount();                int count = Integer.parseInt(countStr);                holder.adv.setCount(++count + "");                childBean.setCount(count);                //发送数量和价钱                childBean.setChecked(true);                //判断该商家的所有商品的checkbox是否都选中                List<ChildBean> childBeanList = childList.get(groupPosition);                if (isChildChecked(childBeanList)) {                    groupList.get(groupPosition).setChecked(true);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(isGroupChecked());                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                } else {                    groupList.get(groupPosition).setChecked(false);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(false);                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                }                MessageCounEvent counEvent = new MessageCounEvent();                counEvent.setMoney(totalMoney());                counEvent.setCount(totalCount());                EventBus.getDefault().post(counEvent);            }        });        holder.adv.setOnDelClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String countStr = holder.adv.getCount();                int count = Integer.parseInt(countStr);                count = --count < 1 ? 1 : count;                holder.adv.setCount(count + "");                childBean.setCount(count);                if (count > 1) {                    childBean.setChecked(true);                }                List<ChildBean> childBeanList = childList.get(groupPosition);                if(isChildChecked(childBeanList)){                    groupList.get(groupPosition).setChecked(true);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(isGroupChecked());                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                }else{                    groupList.get(groupPosition).setChecked(false);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(false);                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                }                MessageCounEvent counEvent = new MessageCounEvent();                counEvent.setMoney(totalMoney());                counEvent.setCount(totalCount());                EventBus.getDefault().post(counEvent);                notifyDataSetChanged();            }        });        return view;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;    }    class GroupViewHolder {        CheckBox cb;        TextView tv;    }    class ChildViewHolder {        CheckBox cb;        TextView tv;        TextView tvMoney;        AddDelView adv;    }    /**     * 判断商家是否有未选中     */    private boolean isGroupChecked() {        for (GroupBean groupBean : groupList) {            if (!groupBean.isChecked()) {                return false;            }        }        return true;    }    /**     * 二级Checkbox点击事件     */    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<ChildBean> 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                MessageCounEvent counEvent = new MessageCounEvent();                counEvent.setCount(totalCount());                counEvent.setMoney(totalMoney());                EventBus.getDefault().post(counEvent);                //判断该商家的所有商品的checkbox是否都选中                if (isChildChecked(childBeen)) {                    groupList.get(groupPosition).setChecked(true);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(isGroupChecked());                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                } else {                    groupList.get(groupPosition).setChecked(false);                    MessageEvent msg = new MessageEvent();                    msg.setFlag(false);                    EventBus.getDefault().post(msg);                    notifyDataSetChanged();                }            }        }    }    /**     * 一级Checkbox点击事件     */    class GroupCbOnClickListener implements View.OnClickListener {        private int groupPostion;        public GroupCbOnClickListener(int groupPostion) {            this.groupPostion = groupPostion;        }        @Override        public void onClick(View v) {            if (v instanceof CheckBox) {                CheckBox cb = (CheckBox) v;                groupList.get(groupPostion).setChecked(cb.isChecked());                List<ChildBean> childBeen = childList.get(groupPostion);                for (ChildBean childBean : childBeen) {                    childBean.setChecked(cb.isChecked());                }                //计算商品数，发送主页面显示                MessageCounEvent counEvent = new MessageCounEvent();                counEvent.setMoney(totalMoney());                counEvent.setCount(totalCount());                EventBus.getDefault().post(counEvent);                //判断其他的商家是否选中                MessageEvent msg = new MessageEvent();                msg.setFlag(isGroupChecked());                EventBus.getDefault().post(msg);                notifyDataSetChanged();            }        }    }    /**     * 判断商品是否有未选中     */    private boolean isChildChecked(List<ChildBean> list) {        for (ChildBean childBean : list) {            if (!childBean.isChecked()) {                return false;            }        }        return true;    }    /**     * 全选     */    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);            }        }        //计算商品数        MessageCounEvent counEvent = new MessageCounEvent();        counEvent.setCount(totalCount());        counEvent.setMoney(totalMoney());        EventBus.getDefault().post(counEvent);        notifyDataSetChanged();    }    private int totalCount() {        int 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()) {                    int c = childList.get(i).get(j).getCount();                    count += c;                }            }        }        return count;    }    private float totalMoney() {        float money = 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()) {                    //遍历所有的商品，只要是选中状态的，就计算价格                    int c = childList.get(i).get(j).getCount();                    float m = childList.get(i).get(j).getMoney();                    money += c * m;                }            }        }        return money;    }}

//countEvent

public class MessageCounEvent {    private int count;    private float money;    public float getMoney() {        return money;    }    public void setMoney(float money) {        this.money = money;    }    public int getCount() {        return count;    }    public void setCount(int count) {        this.count = count;    }}

//msgEvent

public class MessageEvent {    private boolean flag;    public boolean isFlag() {        return flag;    }    public void setFlag(boolean flag) {        this.flag = flag;    }}

//自定义 + - 符号

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:gravity="center_vertical"    android:orientation="horizontal">    <TextView        android:id="@+id/del"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/circle_shape"        android:gravity="center"        android:paddingBottom="2dp"        android:text="－" />    <TextView        android:id="@+id/num"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="3dp"        android:layout_marginRight="3dp"        android:gravity="center"        android:text="1" />    <TextView        android:id="@+id/add"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/circle_shape"        android:gravity="center"        android:text="＋" /></LinearLayout>

//父类布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="40dp"    android:background="#330000ff"    android:gravity="center_vertical"    android:orientation="horizontal">    <CheckBox        android:id="@+id/cb"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/tvName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="5dp" /></LinearLayout>

//子类布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="40dp"    android:background="#330000ff"    android:gravity="center_vertical"    android:orientation="horizontal"    android:paddingLeft="20dp">    <CheckBox        android:id="@+id/cb"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/tvName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="5dp" />    <TextView        android:id="@+id/tvPrice"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="15dp" />    <com.example.administrator.lasttext.AddDelView        android:id="@+id/adv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="15dp"></com.example.administrator.lasttext.AddDelView></LinearLayout>

//购物车Main布局

<?xml version="1.0" encoding="utf-8"?><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.administrator.lasttext.MainActivity">    <TextView        android:layout_width="match_parent"        android:layout_height="40dp"        android:background="#ff3660"        android:gravity="center"        android:text="购物车"        android:textColor="#ffffff"        android:textSize="20sp" />    <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:background="#33000000">        <CheckBox            android:id="@+id/cbAll"            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_alignParentRight="true"            android:layout_centerVertical="true"            android:text="合计：" />    </RelativeLayout></LinearLayout>

//自定义外圈

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval">    <stroke        android:width="1dp"        android:color="#33000000"></stroke>    <solid android:color="@android:color/transparent"></solid></shape>

//EventBus依赖

compile 'org.greenrobot:eventbus:3.0.0'