逻辑

1.实体类添加属性：isSelect 是否选中
2.适配器根据isSelect判断是否选中+复选框点击
3.全选和取消全选：修改集合中所有的数据源的isSelect—>刷新适配器---->计算总价
4.用户反选：修改当前item的数据源isSelect—>刷新适配器----》计算总价

使用步骤

1.引入库

代码如下（示例）：

implementation 'com.lzy.net:okgo:3.0.4'//okgo依赖
implementation 'com.google.code.gson:gson:2.8.0'//gson依赖
implementation 'com.github.bumptech.glide:glide:4.9.0'//glide依赖
implementation 'com.lzy.net:okgo:3.0.4'//okgo依赖
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.22'//万能适配器
implementation 'com.android.support:recyclerview-v7:30.0.0'//recyclerviewmanifests清单文件记得加网络权限<uses-permission android:name="android.permission.INTERNET" />项目gradle：
allprojects {repositories {google()jcenter()maven { url "https://jitpack.io" }//万能适配器}
}

2.bean类

// 直接get请求 GsonFormat
http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1

****** 加一个是否选中判断
// todo 是否选中
private boolean isSelect;
然后 //get set

public class XiaBean {/*** ret : 1* data : [{"id":"8289","title":"油焖大虾","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg","collect_num":"1670","food_str":"大虾 葱 生姜 植物油 料酒","num":1670},{"id":"2127","title":"四川回锅肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2127.jpg","collect_num":"1591","food_str":"猪肉 青蒜 青椒 红椒 姜片","num":1591},{"id":"30630","title":"超简单芒果布丁","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/31/30630.jpg","collect_num":"1549","food_str":"QQ糖 牛奶 芒果","num":1549},{"id":"9073","title":"家常红烧鱼","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9073.jpg","collect_num":"1426","food_str":"鲜鱼 姜 葱 蒜 花椒","num":1426},{"id":"10097","title":"家常煎豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10097.jpg","collect_num":"1419","food_str":"豆腐 新鲜红椒 青椒 葱花 油","num":1419},{"id":"10509","title":"水煮肉片","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10509.jpg","collect_num":"1342","food_str":"瘦猪肉 生菜 豆瓣酱 干辣椒 花椒","num":1342},{"id":"46968","title":"红糖苹果银耳汤","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/47/46968.jpg","collect_num":"1253","food_str":"银耳 苹果 红糖","num":1253},{"id":"10191","title":"麻婆豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10191.jpg","collect_num":"1224","food_str":"豆腐 肉末 生抽 白糖 芝麻油","num":1224},{"id":"2372","title":"皮蛋瘦肉粥","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2372.jpg","collect_num":"1151","food_str":"大米 皮蛋 猪肉 油条 香葱","num":1151},{"id":"2166","title":"蚂蚁上树","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2166.jpg","collect_num":"1145","food_str":"红薯粉 肉 姜 蒜 花椒","num":1145},{"id":"2262","title":"糖醋肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2262.jpg","collect_num":"1081","food_str":"猪肉 红椒 黄椒 洋葱 蛋清","num":1081},{"id":"9971","title":"鱼香豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9971.jpg","collect_num":"1010","food_str":"豆腐 木耳 胡萝卜 香葱 番茄酱","num":1010},{"id":"10172","title":"干煸四季豆","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10172.jpg","collect_num":"993","food_str":"四季豆 干辣椒 蒜头 酱油 糖","num":993},{"id":"2685","title":"胡萝卜肉末蒸蛋","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2685.jpg","collect_num":"929","food_str":"胡萝卜 肉 蛋 生抽 盐","num":929},{"id":"9972","title":"虎皮青椒","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9972.jpg","collect_num":"892","food_str":"青辣椒 大蒜 香醋 白糖 生抽","num":892},{"id":"10437","title":"叉烧排骨","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10437.jpg","collect_num":"806","food_str":"排骨 李锦记叉烧酱 植物油 清水 油菜","num":806},{"id":"2892","title":"\u201c五行\u201d彩蔬汤","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2892.jpg","collect_num":"761","food_str":"黑木耳 玉米 牛蒡 胡萝卜 西兰花","num":761},{"id":"2348","title":"麻辣肉丝面","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2348.jpg","collect_num":"760","food_str":"面条 肉丝 淀粉 酱油 辣椒","num":760},{"id":"10044","title":"土豆炖翅根","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10044.jpg","collect_num":"758","food_str":"土豆 翅根 葱 姜 料酒","num":758},{"id":"33783","title":"美人豆浆","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/34/33783.jpg","collect_num":"758","food_str":"黄豆 红豆 绿豆 黑豆 黑米","num":758}]*/private int ret;private List<DataBean> data;public int getRet() {return ret;}public void setRet(int ret) {this.ret = ret;}public List<DataBean> getData() {return data;}public void setData(List<DataBean> data) {this.data = data;}public static class DataBean {/*** id : 8289* title : 油焖大虾* pic : http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg* collect_num : 1670* food_str : 大虾 葱 生姜 植物油 料酒* num : 1670*/private String id;private String title;private String pic;private String collect_num;private String food_str;private int num;// todo 是否选中private boolean isSelect;public boolean isSelect() {return isSelect;}public void setSelect(boolean select) {isSelect = select;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getPic() {return pic;}public void setPic(String pic) {this.pic = pic;}public String getCollect_num() {return collect_num;}public void setCollect_num(String collect_num) {this.collect_num = collect_num;}public String getFood_str() {return food_str;}public void setFood_str(String food_str) {this.food_str = food_str;}public int getNum() {return num;}public void setNum(int num) {this.num = num;}}
}

3.主UI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=".ShoppingActivity"><androidx.appcompat.widget.Toolbarandroid:layout_width="match_parent"android:layout_height="50dp"android:background="#DBC4C4"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="购物车"android:textColor="#fff"android:layout_centerInParent="true"/><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:layout_alignParentRight="true"android:text="编辑"android:gravity="center"android:id="@+id/tv_edit"/></RelativeLayout></androidx.appcompat.widget.Toolbar><androidx.recyclerview.widget.RecyclerViewandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="10"android:id="@+id/rv"></androidx.recyclerview.widget.RecyclerView><LinearLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:gravity="center"><CheckBoxandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/cb_all"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="全选"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/tv_price"android:text="合计  0"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="结算"android:id="@+id/bt"/></LinearLayout>
</LinearLayout>

4.UI代码片


/*** 1.实体类添加属性：isSelect 是否选中* 2.适配器根据isSelect判断是否选中+复选框点击* 3.全选和取消全选：修改集合中所有的数据源的isSelect--->刷新适配器----》计算总价* 4.用户反选：修改当前item的数据源isSelect--->刷新适配器----》计算总价*/
public class ShoppingActivity extends AppCompatActivity {//编辑/删除 按钮private TextView tvEdit;private RecyclerView rv;//全选框private CheckBox cbAll;//价格private TextView tvPrice;//结算private Button bt;private XiaAdapter xiaAdapter;private List<XiaBean.DataBean> listBeans = new ArrayList<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_shopping);initView();initData();}private void initData() {OkGo.<String>get("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1").execute(new StringCallback() {@Overridepublic void onSuccess(Response<String> response) {String json = response.body();XiaBean xiaBean = new Gson().fromJson(json, XiaBean.class);List<XiaBean.DataBean> list = xiaBean.getData();listBeans.addAll(list);xiaAdapter.notifyDataSetChanged();}});}private void initView() {tvEdit = (TextView) findViewById(R.id.tv_edit);rv = (RecyclerView) findViewById(R.id.rv);cbAll = (CheckBox) findViewById(R.id.cb_all);tvPrice = (TextView) findViewById(R.id.tv_price);bt = (Button) findViewById(R.id.bt);xiaAdapter = new XiaAdapter(R.layout.item, listBeans);rv.setAdapter(xiaAdapter);rv.setLayoutManager(new LinearLayoutManager(this));//TODO 1:全选和取消全选：修改数据源 刷新适配器cbAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {for (XiaBean.DataBean listBean : listBeans) {listBean.setSelect(isChecked);}xiaAdapter.notifyDataSetChanged();count();}});// TODO  子控件的点击xiaAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {@Overridepublic void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {CheckBox checkBox = (CheckBox) view;listBeans.get(position).setSelect(checkBox.isChecked());//修改数据源xiaAdapter.notifyDataSetChanged();count();}});tvEdit.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {bt.setText("删除");}});}//TODO 2.计算价格private void count() {int count = 0;for (XiaBean.DataBean listBean : listBeans) {if (listBean.isSelect()) {//如果选中count += listBean.getNum();//累加}}tvPrice.setText("合计:" + count + "");}
}

5.item 小布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:orientation="horizontal"android:layout_height="wrap_content">
<CheckBoxandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/cb"/><ImageViewandroid:layout_width="100dp"android:layout_height="100dp"android:src="@mipmap/ic_launcher_round"android:id="@+id/iv"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="11"android:id="@+id/tv"/>
</LinearLayout>

6.适配器

public class XiaAdapter extends BaseQuickAdapter<XiaBean.DataBean, BaseViewHolder> {public XiaAdapter(int layoutResId, @Nullable List<XiaBean.DataBean> data) {super(layoutResId, data);}@Overrideprotected void convert(BaseViewHolder helper, XiaBean.DataBean item) {//价格helper.setText(R.id.tv,item.getNum()+"");//复选框是否选中helper.setChecked(R.id.cb,item.isSelect());Glide.with(mContext).load(item.getPic()).into((ImageView) helper.getView(R.id.iv));//TODO   点击事件helper.addOnClickListener(R.id.cb);CheckBox cb = helper.getView(R.id.cb);cb.setChecked(item.isSelect());}
}

7.效果图

over 。。。

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逻辑

目录