RecyclerView 购物车二级列表

曾经终败给现在 2022-06-05 08:27 220阅读 0赞

效果图：

![Center][]

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在你敲代码时不要忘记导依赖：

compile 'com.squareup.okhttp3:okhttp:3.9.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.9.0'
    compile 'com.google.code.gson:gson:2.8.2'
    compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
    compile 'org.greenrobot:eventbus:3.1.1'

==================================================================

还有网络权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

敲代码时首先把包分清，分别有:

adapter、bean、eventbusevent、model、net、presenter、view这些包，主页面MainActivity放在view里面。

==================================================================

adapter:包里面创建一个MyAdapter类

public class MyAdapter extends BaseExpandableListAdapter {
        private Context context;
        private List<GoosBean.DataBean> groupList;
        private List<List<GoosBean.DataBean.DatasBean>> childList;
    
        private final LayoutInflater inflater;
    
        public MyAdapter(Context context, List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList) {
            this.context = context;
            this.groupList = groupList;
            this.childList = childList;
            inflater = LayoutInflater.from(context);
        }
    
    
        @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(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            View view;
            final GroupViewHolder holder;
    
            if (convertView == null) {
                holder = new GroupViewHolder();
                view = inflater.inflate(R.layout.item_parent_market, null);
                holder.cbGroup = view.findViewById(R.id.cb_parent);
                holder.tv_number = view.findViewById(R.id.tv_number);
                view.setTag(holder);
            } else {
                view = convertView;
                holder = (GroupViewHolder) view.getTag();
            }
            final GoosBean.DataBean dataBean = groupList.get(groupPosition);
    
    
            holder.cbGroup.setChecked(dataBean.isChecked());
            holder.tv_number.setText(dataBean.getTitle());
    
            //一级checkbox
            holder.cbGroup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dataBean.setChecked(holder.cbGroup.isChecked());
                    changeChildCbState(groupPosition, holder.cbGroup.isChecked());
                    EventBus.getDefault().post(compute());
                    changeAllCbState(isAllGroupCbSelected());
                    notifyDataSetChanged();
                }
            });
    
            return view;
        }
    
        @Override
        public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            View view;
            final ChildViewHolder holder;
            if (convertView == null) {
                holder = new ChildViewHolder();
                view = inflater.inflate(R.layout.item_child_market, null);
                holder.cbChild = view.findViewById(R.id.cb_child);
                holder.tv_tel = view.findViewById(R.id.tv_tel);
                holder.tv_content = view.findViewById(R.id.tv_content);
                holder.tv_time = view.findViewById(R.id.tv_time);
                holder.tv_price = view.findViewById(R.id.tv_pri);
                holder.tv_del = view.findViewById(R.id.tv_del);
                holder.iv_add = view.findViewById(R.id.iv_add);
                holder.iv_del = view.findViewById(R.id.iv_del);
                holder.tv_num = view.findViewById(R.id.tv_num);
                view.setTag(holder);
            } else {
                view = convertView;
                holder = (ChildViewHolder) view.getTag();
            }
            final GoosBean.DataBean.DatasBean datasBean = childList.get(groupPosition).get(childPosition);
            holder.cbChild.setChecked(datasBean.isChecked());
            holder.tv_tel.setText(datasBean.getType_name());
            holder.tv_content.setText(datasBean.getMsg());
            holder.tv_time.setText(datasBean.getAdd_time());
            holder.tv_price.setText(datasBean.getPrice() + "");
            holder.tv_num.setText(datasBean.getNum() + "");
    
            //二级checkbox
            holder.cbChild.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //设置该条目对象里的checked属性值
                    datasBean.setChecked(holder.cbChild.isChecked());
                    PriceAndCountEvent priceAndCountEvent = compute();
                    EventBus.getDefault().post(priceAndCountEvent);
    
                    if (holder.cbChild.isChecked()) {
                        //当前checkbox是选中状态
                        if (isAllChildCbSelected(groupPosition)) {
                            changGroupCbState(groupPosition, true);
                            changeAllCbState(isAllGroupCbSelected());
                        }
                    } else {
                        changGroupCbState(groupPosition, false);
                        changeAllCbState(isAllGroupCbSelected());
                    }
                    notifyDataSetChanged();
                }
            });
            //加号
            holder.iv_add.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int num = datasBean.getNum();
                    holder.tv_num.setText(++num + "");
                    datasBean.setNum(num);
                    if (holder.cbChild.isChecked()) {
                        PriceAndCountEvent priceAndCountEvent = compute();
                        EventBus.getDefault().post(priceAndCountEvent);
                    }
                }
            });
            //减号
            holder.iv_del.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int num = datasBean.getNum();
                    if (num == 1) {
                        return;
                    }
                    holder.tv_num.setText(--num + "");
                    datasBean.setNum(num);
                    if (holder.cbChild.isChecked()) {
                        PriceAndCountEvent priceAndCountEvent = compute();
                        EventBus.getDefault().post(priceAndCountEvent);
                    }
                }
            });
            //删除
            holder.tv_del.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
                    GoosBean.DataBean.DatasBean remove = datasBeen.remove(childPosition);
                    if (datasBeen.size() == 0) {
                        childList.remove(groupPosition);
                        groupList.remove(groupPosition);
                    }
                    EventBus.getDefault().post(compute());
                    notifyDataSetChanged();
                }
            });
            return view;
        }
    
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
    
        class GroupViewHolder {
            CheckBox cbGroup;
            TextView tv_number;
        }
    
        class ChildViewHolder {
            CheckBox cbChild;
            TextView tv_tel;
            TextView tv_content;
            TextView tv_time;
            TextView tv_price;
            TextView tv_del;
            ImageView iv_del;
            ImageView iv_add;
            TextView tv_num;
        }
    
        /**
         * 改变全选的状态
         *
         * @param flag
         */
        private void changeAllCbState(boolean flag) {
            MessageEvent messageEvent = new MessageEvent();
            messageEvent.setChecked(flag);
            EventBus.getDefault().post(messageEvent);
        }
    
        /**
         * 改变一级列表checkbox状态
         *
         * @param groupPosition
         */
        private void changGroupCbState(int groupPosition, boolean flag) {
            GoosBean.DataBean dataBean = groupList.get(groupPosition);
            dataBean.setChecked(flag);
        }
    
        /**
         * 改变二级列表checkbox状态
         *
         * @param groupPosition
         * @param flag
         */
        private void changeChildCbState(int groupPosition, boolean flag) {
            List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
            for (int i = 0; i < datasBeen.size(); i++) {
                GoosBean.DataBean.DatasBean datasBean = datasBeen.get(i);
                datasBean.setChecked(flag);
            }
        }
    
        /**
         * 判断一级列表是否全部选中
         *
         * @return
         */
        private boolean isAllGroupCbSelected() {
            for (int i = 0; i < groupList.size(); i++) {
                GoosBean.DataBean dataBean = groupList.get(i);
                if (!dataBean.isChecked()) {
                    return false;
                }
            }
            return true;
        }
    
        /**
         * 判断二级列表是否全部选中
         *
         * @param groupPosition
         * @return
         */
        private boolean isAllChildCbSelected(int groupPosition) {
            List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
            for (int i = 0; i < datasBeen.size(); i++) {
                GoosBean.DataBean.DatasBean datasBean = datasBeen.get(i);
                if (!datasBean.isChecked()) {
                    return false;
                }
            }
            return true;
        }
    
        /**
         * 计算列表中，选中的钱和数量
         */
        private PriceAndCountEvent compute() {
            int count = 0;
            int price = 0;
            for (int i = 0; i < childList.size(); i++) {
                List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(i);
                for (int j = 0; j < datasBeen.size(); j++) {
                    GoosBean.DataBean.DatasBean datasBean = datasBeen.get(j);
                    if (datasBean.isChecked()) {
                        price += datasBean.getNum() * datasBean.getPrice();
                        count += datasBean.getNum();
                    }
                }
            }
    
            PriceAndCountEvent priceAndCountEvent = new PriceAndCountEvent();
            priceAndCountEvent.setCount(count);
            priceAndCountEvent.setPrice(price);
            return priceAndCountEvent;
        }
    
        /**
         * 设置全选、反选
         *
         * @param flag
         */
        public void changeAllListCbState(boolean flag) {
            for (int i = 0; i < groupList.size(); i++) {
                changGroupCbState(i, flag);
                changeChildCbState(i, flag);
            }
            EventBus.getDefault().post(compute());
            notifyDataSetChanged();
        }
    
    }

==================================================================

bean包里面创建一个GoosBean

public class GoosBean {
    
        /**
         * code : 200
         * data : [{"datas":[{"add_time":"2016-12-10 14:54:58","cart_id":"445162","house_id":"1","msg":"购买渠道:大陆国行","price":500,"type_name":"苹果 iPhone 6（白金色）","type_sn_id":"ggh"},{"add_time":"2016-12-10 14:55:18","cart_id":"445163","house_id":"1","msg":"购买渠道:水货无锁","price":1000,"type_name":"苹果 iPhone 7 （亮黑色）","type_sn_id":"tgg"}],"title":"苹果","title_id":"59280"},{"datas":[{"add_time":"2016-12-10 14:54:58","cart_id":"445162","house_id":"1","msg":"边框背板:全新未使用","price":50,"type_name":"小米4s (白金色)","type_sn_id":"ggh"},{"add_time":"2016-12-10 14:55:18","cart_id":"445163","house_id":"1","msg":"屏幕性能:色差/亮点/轻微发黄","price":100,"type_name":"小米5s （亮黑色）","type_sn_id":"tgg"}],"title":"小米","title_id":"59279"},{"datas":[{"add_time":"2016-12-10 14:54:58","cart_id":"445162","house_id":"1","msg":"边框背板:全新未使用","price":50,"type_name":"三星 (白金色)","type_sn_id":"ggh"},{"add_time":"2016-12-10 14:55:18","cart_id":"445163","house_id":"1","msg":"屏幕性能:色差/亮点/轻微发黄","price":100,"type_name":"三星 （亮黑色）","type_sn_id":"tgg"}],"title":"三星","title_id":"59279"},{"datas":[{"add_time":"2016-12-10 14:54:58","cart_id":"445162","house_id":"1","msg":"边框背板:全新未使用","price":50,"type_name":"华为 (白金色)","type_sn_id":"ggh"},{"add_time":"2016-12-10 14:55:18","cart_id":"445163","house_id":"1","msg":"屏幕性能:色差/亮点/轻微发黄","price":100,"type_name":"华为 （亮黑色）","type_sn_id":"tgg"},{"add_time":"2016-12-10 4:55:28","cart_id":"445164","house_id":"1","msg":"屏幕性能:色差/亮点/轻微发黄","price":150,"type_name":"华为 （纯黑色）","type_sn_id":"hgg"}],"title":"华为","title_id":"59279"}]
         * flag : Success
         * msg : 描述
         */
    
        private String code;
        private String flag;
        private String msg;
        private List<DataBean> data;
    
        public String getCode() {
            return code;
        }
    
        public void setCode(String code) {
            this.code = code;
        }
    
        public String getFlag() {
            return flag;
        }
    
        public void setFlag(String flag) {
            this.flag = flag;
        }
    
        public String getMsg() {
            return msg;
        }
    
        public void setMsg(String msg) {
            this.msg = msg;
        }
    
        public List<DataBean> getData() {
            return data;
        }
    
        public void setData(List<DataBean> data) {
            this.data = data;
        }
    
        public static class DataBean {
            /**
             * datas : [{"add_time":"2016-12-10 14:54:58","cart_id":"445162","house_id":"1","msg":"购买渠道:大陆国行","price":500,"type_name":"苹果 iPhone 6（白金色）","type_sn_id":"ggh"},{"add_time":"2016-12-10 14:55:18","cart_id":"445163","house_id":"1","msg":"购买渠道:水货无锁","price":1000,"type_name":"苹果 iPhone 7 （亮黑色）","type_sn_id":"tgg"}]
             * title : 苹果
             * title_id : 59280
             */
            private boolean checked;
            private String title;
            private String title_id;
            private List<DatasBean> datas;
    
            public boolean isChecked() {
                return checked;
            }
    
            public void setChecked(boolean checked) {
                this.checked = checked;
            }
    
            public String getTitle() {
                return title;
            }
    
            public void setTitle(String title) {
                this.title = title;
            }
    
            public String getTitle_id() {
                return title_id;
            }
    
            public void setTitle_id(String title_id) {
                this.title_id = title_id;
            }
    
            public List<DatasBean> getDatas() {
                return datas;
            }
    
            public void setDatas(List<DatasBean> datas) {
                this.datas = datas;
            }
    
            public static class DatasBean {
                /**
                 * add_time : 2016-12-10 14:54:58
                 * cart_id : 445162
                 * house_id : 1
                 * msg : 购买渠道:大陆国行
                 * price : 500
                 * type_name : 苹果 iPhone 6（白金色）
                 * type_sn_id : ggh
                 */
                private boolean checked;
                private int num = 1;
                private String add_time;
                private String cart_id;
                private String house_id;
                private String msg;
                private int price;
                private String type_name;
                private String type_sn_id;
    
                public int getNum() {
                    return num;
                }
    
                public void setNum(int num) {
                    this.num = num;
                }
    
                public boolean isChecked() {
                    return checked;
                }
    
                public void setChecked(boolean checked) {
                    this.checked = checked;
                }
    
                public String getAdd_time() {
                    return add_time;
                }
    
                public void setAdd_time(String add_time) {
                    this.add_time = add_time;
                }
    
                public String getCart_id() {
                    return cart_id;
                }
    
                public void setCart_id(String cart_id) {
                    this.cart_id = cart_id;
                }
    
                public String getHouse_id() {
                    return house_id;
                }
    
                public void setHouse_id(String house_id) {
                    this.house_id = house_id;
                }
    
                public String getMsg() {
                    return msg;
                }
    
                public void setMsg(String msg) {
                    this.msg = msg;
                }
    
                public int getPrice() {
                    return price;
                }
    
                public void setPrice(int price) {
                    this.price = price;
                }
    
                public String getType_name() {
                    return type_name;
                }
    
                public void setType_name(String type_name) {
                    this.type_name = type_name;
                }
    
                public String getType_sn_id() {
                    return type_sn_id;
                }
    
                public void setType_sn_id(String type_sn_id) {
                    this.type_sn_id = type_sn_id;
                }
            }
        }
    }

==================================================================

eventbusevent包里面创建二两个类，一个是MessageEvent、PriceAndCountEvent

public class MessageEvent {
        private boolean checked;
    
        public boolean isChecked() {
            return checked;
        }
    
        public void setChecked(boolean checked) {
            this.checked = checked;
        }
    }

public class PriceAndCountEvent {
    
        private int price;
        private int count;
    
        public int getPrice() {
            return price;
        }
    
        public void setPrice(int price) {
            this.price = price;
        }
    
        public int getCount() {
            return count;
        }
    
        public void setCount(int count) {
            this.count = count;
        }
    
    }

==================================================================

model包创建二两个类，一个是IMainModel接口，MainModel

public interface IMainModel {
    
       public void getGoods(OnNetListener<GoosBean> onNetListener);
    
    
    }

public class MainModel implements IMainModel {
        private Handler handler = new Handler(Looper.getMainLooper());
    
    
        public void getGoods(final OnNetListener<GoosBean> onNetListener) {
            HttpUtils.getHttpUtils().doGet(Api.url, 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 GoosBean goosBean = new Gson().fromJson(string, GoosBean.class);
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            onNetListener.onSuccess(goosBean);
                        }
                    });
                }
            });
        }
    }

==================================================================

net包里面创建三个类，第一个类 Api 接口是 获取网络数据的，第二类 HttpUtils 是请求，第三个类OnNetListener接口。

public interface Api {
        //网上获取数据
        public static final String url = "http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=evaluation";
    
    }

public class HttpUtils {
    
        private static volatile HttpUtils httpUtils;
        private final OkHttpClient client;
    
        private HttpUtils() {
    
            HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
            logging.setLevel(HttpLoggingInterceptor.Level.BODY);
            client = new OkHttpClient.Builder()
                    .addInterceptor(logging)
                    .build();
        }
    
        public static HttpUtils getHttpUtils() {
            if (httpUtils == null) {
                synchronized (HttpUtils.class) {
                    if (httpUtils == null) {
                        httpUtils = new HttpUtils();
                    }
                }
            }
            return httpUtils;
        }
    
        /**
         * GET请求
         *
         * @param url
         * @param callback
         */
        public void doGet(String url, Callback callback) {
            Request request = new Request.Builder().url(url).build();
            client.newCall(request).enqueue(callback);
        }
    }

public interface OnNetListener<T> {
    
        public void onSuccess(T t);
    
        public void onFailure(Exception e);
    
    }

==================================================================

Presenter包里面创建一个MainPresenter类

public class MainPresenter {
    
        private final IMainModel imainModel;
        private final IMainActivity iMainActivity;
    
        public MainPresenter(MainActivity iMainActivity) {
    
            this.iMainActivity = iMainActivity;
            imainModel = new MainModel();
        }
    
        public void getGoods() {
            imainModel.getGoods(new OnNetListener<GoosBean>() {
                @Override
                public void onSuccess(GoosBean goosBean) {
                    //List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList
    
                    List<GoosBean.DataBean> dataBean = goosBean.getData();
                    List<List<GoosBean.DataBean.DatasBean>> childList = new ArrayList<List<GoosBean.DataBean.DatasBean>>();
                    for (int i = 0; i < dataBean.size(); i++) {
                        List<GoosBean.DataBean.DatasBean> datas = dataBean.get(i).getDatas();
                        childList.add(datas);
                    }
                    iMainActivity.showList(dataBean, childList);
                }
    
                @Override
                public void onFailure(Exception e) {
    
                }
            });
    
        }
    }

==================================================================

View包里面创建二个类，第一个是IMainActivity接口，第二个就是MainActivity主页面

public interface IMainActivity {
    
        //view接口进行调用
        public void showList
                (List<GoosBean.DataBean>
                    groupList, List<List<GoosBean.DataBean.DatasBean>>childList);
    
    }

//主页面，调用IMainActivity的接口
    public class MainActivity extends AppCompatActivity
            implements IMainActivity {
    
        private ExpandableListView mElv;
        private CheckBox mCheckbox2;
        /**
         * 0
         */
        private TextView mTvPrice;
        /**
         * 结算(0)
         */
        private TextView mTvNum;
        private MyAdapter adapter;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            EventBus.getDefault().register(this);
    
            //方法
            initView();
    
            new MainPresenter(this).getGoods();
    
            mCheckbox2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    adapter.changeAllListCbState(mCheckbox2.isChecked());
                }
            });
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            EventBus.getDefault().unregister(this);
    
        }
    
        private void initView() {
            mElv = (ExpandableListView) findViewById(R.id.elv);
            mCheckbox2 = (CheckBox) findViewById(R.id.checkbox2);
            mTvPrice = (TextView) findViewById(R.id.tv_price);
            mTvNum = (TextView) findViewById(R.id.tv_num);
        }
    
        @Override
        public void showList(List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList) {
            adapter = new MyAdapter(this, groupList, childList);
            mElv.setAdapter(adapter);
            mElv.setGroupIndicator(null);
            //默认让其全部展开
            for (int i = 0; i < groupList.size(); i++) {
    
                mElv.expandGroup(i);
            }
    
        }
    
        @Subscribe
        public void onMessageEvent(MessageEvent event) {
    
            mCheckbox2.setChecked(event.isChecked());
    
        }
    
        @Subscribe
        public void onMessageEvent(PriceAndCountEvent event) {
    
            mTvNum.setText("结算(" + event.getCount() + ")");
            mTvPrice.setText(event.getPrice() + "");
        }
    
    }

==================================================================

布局页面：

activity\_main:

==================================================================

item\_child\_market:

==================================================================

item\_parent\_market:

[Center]: /images/20220605/7b71507e750642d08b8509a783fbc11a.png