简单自定义实现京东购物车

依赖

//okhttp
    implementation 'com.squareup.okhttp3:okhttp:3.11.0'
    //okhttp的log信息
    implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
    //gson
    implementation 'com.google.code.gson:gson:2.8.5'
    //glide
    implementation 'com.github.bumptech.glide:glide:4.7.1'
    //xrecyclerview
    implementation 'com.jcodecraeer:xrecyclerview:1.5.9'
}
configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion '27.1.1'
            }
        }
    }
}

权限

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

先写流式布局

自定义View     

public class CustomView extends ViewGroup {
    private int mleftMargin=20;
    private int mtopMargin=20;

    public CustomView(Context context) {
        this(context,null);
    }

    public CustomView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        measureChildren(widthMeasureSpec,heightMeasureSpec);

        int leftMargin = mleftMargin;
        int topMargin = mtopMargin;

        int viewHeight = 0;
        int viewWidth = 0;

        //父控件传进来的宽度和高度以及对应的测量模式
        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        switch (modeHeight){
            case MeasureSpec.AT_MOST:
                int measuredHeight = 0;
                for (int j = 0; j < getChildCount(); j++) {
                    int measuredWidth = getChildAt(j).getMeasuredWidth();
                    measuredHeight = getChildAt(j).getMeasuredHeight();
                    if (leftMargin+measuredWidth+mleftMargin>getWidth()){
                        leftMargin=mleftMargin;
                        topMargin+=measuredHeight+mtopMargin;
                    }
                    leftMargin+=measuredWidth+mleftMargin;
                }
                topMargin+=measuredHeight+mtopMargin;
                break;
        }
        setMeasuredDimension(sizeWidth,topMargin);
    }

    @Override
    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {
        int leftMargin = mleftMargin;
        int topMargin = mtopMargin;

        for (int j = 0; j < getChildCount(); j++) {
            int measuredWidth = getChildAt(j).getMeasuredWidth();
            int measuredHeight = getChildAt(j).getMeasuredHeight();
            if (leftMargin+measuredWidth+mleftMargin>getWidth()){
                leftMargin=mleftMargin;
                topMargin+=measuredHeight+mtopMargin;
                getChildAt(j).layout(leftMargin,topMargin,leftMargin+measuredWidth,topMargin+measuredHeight);
            }else {
                getChildAt(j).layout(leftMargin,topMargin,leftMargin+measuredWidth,topMargin+measuredHeight);
            }
            leftMargin+=measuredWidth+mleftMargin;
        }
    }
}

布局 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.bwie.main.yk_001.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/shape"
        android:orientation="horizontal">

        <FrameLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1">

            <EditText
                android:id="@+id/edt"
                android:textColorHighlight="#ff44ff"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="请输入搜索内容" />
        </FrameLayout>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:id="@+id/but"
            android:background="#808080"
            android:textSize="20dp"
            android:text="搜索" />

    </LinearLayout>

    <com.bwie.main.yk_001.CustomView
        android:id="@+id/afl_cotent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="#C0C0C0" />
    <stroke
        android:width="1dip"
        android:color="#C0C0C0" />
    <padding
        android:bottom="5dp"
        android:left="12dp"
        android:right="12dp"
        android:top="5dp" />
    <corners android:radius="80dp" />
</shape>

sub_item.xml

<?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="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_attr_tag"
        android:layout_margin="10dp"
        android:background="@drawable/shape"
        />

</LinearLayout>

代码页面MainActivity

public class MainActivity extends AppCompatActivity {

    private EditText edt;
    private Button but;
    private CustomView afl_cotent;
    private LayoutInflater layoutInflater;
    private TextView tvAttrTag;
    private List<String> list2 = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    private void initView() {
        edt = findViewById(R.id.edt);
        but = findViewById(R.id.but);
        afl_cotent = findViewById(R.id.afl_cotent);
        layoutInflater = LayoutInflater.from(this);
        //点击搜索按钮添加到历史记录
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //获取输入框内容
                String s = edt.getText().toString();
                //判断输入框内容不可为空
                if (!TextUtils.isEmpty(s)){
                    View item = layoutInflater.inflate(R.layout.sub_item, null);
                    tvAttrTag = item.findViewById(R.id.tv_attr_tag);
                    list2.add(s);
                    for (int i = 0; i < list2.size(); i++) {
                        tvAttrTag.setText(list2.get(i));
                    }
                    afl_cotent.addView(item);
                    //点击流式布局跳转购物车页面
                    afl_cotent.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            startActivity(new Intent(MainActivity.this,ShoppActivity.class));
                            finish();
                        }
                    });
                }
            }
        });
    }
}

新建构物车页面

布局

activity_shopp.xml

<?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.bwie.main.yk_001.ShoppActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center"
        >

        <TextView
            android:onClick="returntt"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="返回"
            android:textSize="18dp"/>

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="9"
            android:gravity="center"
            android:text="购物车"
            android:textSize="25dp"/>

    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#909090"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/carGV"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="8" />

    <RelativeLayout
        android:id="@+id/cart_bottom_layout"
        android:padding="5dp"
        android:background="#AAAAAA"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <CheckBox
            android:layout_centerVertical="true"
            android:id="@+id/allCheckbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <TextView
            android:id="@+id/totalpriceTv"
            android:textColor="#ffffff"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@+id/allCheckbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="总价:"/>

        <Button
            android:id="@+id/buy"
            android:layout_alignParentRight="true"
            android:text="去结算"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </RelativeLayout>

</LinearLayout>

jia_jian_layout.xml

<?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:layout_margin="5dp"
    android:orientation="horizontal"
    android:background="@drawable/jia_jian_bg">

    <TextView
        android:id="@+id/jian"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="-"
        android:textSize="25sp"
        android:padding="5dp"/>

    <View
        android:layout_width="1px"
        android:layout_height="match_parent"
        android:background="#999999"/>

    <EditText
        android:id="@+id/num"
        android:layout_weight="1"
        android:text="10"
        android:gravity="center"
        android:background="#00000000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <View
        android:layout_width="1px"
        android:layout_height="match_parent"
        android:background="#999999"/>
    <TextView
        android:id="@+id/jia"
        android:textSize="25sp"
        android:padding="5dp"
        android:text="+"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

shop_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:padding="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" android:orientation="horizontal">

        <CheckBox
            android:id="@+id/sellerCheckbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <TextView
            android:id="@+id/sellerNameTv"
            android:text="商家"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#999999"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/productXRV"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

product_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" 
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:padding="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" android:orientation="horizontal">

        <LinearLayout

            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:orientation="horizontal">
            <CheckBox
                android:id="@+id/productCheckbox"
                android:layout_gravity="center"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <ImageView
                android:src="@mipmap/ic_launcher"
                android:id="@+id/product_icon"
                android:layout_width="80dp"
                android:layout_height="80dp"/>
        </LinearLayout>

        <LinearLayout
            android:layout_marginLeft="10dp"
            android:layout_width="match_parent"
            android:layout_gravity="center"
            android:layout_height="wrap_content" android:orientation="vertical">

            <TextView
                android:id="@+id/title"
                android:text="商品标题"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
            <RelativeLayout
                android:layout_marginTop="15dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <TextView
                    android:id="@+id/price"
                    android:layout_alignParentLeft="true"
                    android:text="优惠价：¥99.99"
                    android:textColor="@android:color/holo_red_light"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>

                <com.bwie.main.yk_001.common.MyJIaJianView
                    android:id="@+id/jiajianqi"
                    android:layout_alignParentRight="true"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>

            </RelativeLayout>
        </LinearLayout>
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#999999"/>

</LinearLayout>

jia_jian_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="#ffffff"/>
    <size android:width="100dp" android:height="30dp"/>
    <stroke android:width="1px" android:color="#999999"/>

</shape>

代码页面

ShoppActivity

public class ShoppActivity extends AppCompatActivity implements ShopView, ShopAllCheckboxListener {

    private ShopPresenter shopPresenter;
    private RecyclerView xRecyclerView;
    private ShopAdapter shopAdapter;
    private List<ShopBean.DataBean> list;
    private CheckBox allCheckbox;
    private double totalprice = 0;
    private TextView totalpriceTv;
    private int page = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shopp);
        initView();
        initData();
    }
    //初始化
    private void initView() {
        list = new ArrayList<>();
        xRecyclerView = findViewById(R.id.carGV);
        allCheckbox = findViewById(R.id.allCheckbox);
        totalpriceTv = findViewById(R.id.totalpriceTv);
        //设置布局的列表样式
        xRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        shopAdapter = new ShopAdapter(this,list);
        shopAdapter.setShopAllCheckboxListener(this);
        //设置点击事件
        allCheckbox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (allCheckbox.isChecked()){
                    if (list != null && list.size() >0){
                        for (int i = 0; i < list.size(); i++) {
                            list.get(i).setSelected(true);
                            for (int i1 = 0; i1 < list.get(i).getList().size(); i1++) {
                                list.get(i).getList().get(i1).setSelected(true);
                            }
                        }
                    }
                }else {
                    if (list != null && list.size() > 0){
                        for (int i = 0; i < list.size(); i++) {
                            list.get(i).setSelected(false);
                            for (int i1 = 0; i1 < list.get(i).getList().size(); i1++) {
                                list.get(i).getList().get(i1).setSelected(false);
                            }
                        }
                    }
                    totalprice = 0;
                }
                //刷新展示列表
                shopAdapter.notifyDataSetChanged();
                totalprice();
            }
        });
    }
    private void initData() {
        //请求数据
        HashMap<String,String> params = new HashMap<>();
        params.put("uid","71");
        params.put("page",page+"");
        shopPresenter = new ShopPresenter(this);
        shopPresenter.getCarts(params,Constants.GETCARTS);
    }

    //返回按钮
    public void returntt(View view) {
        startActivity(new Intent(ShoppActivity.this,MainActivity.class));
        finish();
    }
    //请求成功,刷新购物车
    @Override
    public void success(final ShopBean shopBean) {
        List<ShopBean.DataBean> data = shopBean.getData();
        list.addAll(data);
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                if (page == 1){
                    //展示列表数据
                    shopAdapter = new ShopAdapter(ShoppActivity.this,list);
                    xRecyclerView.setAdapter(shopAdapter);
                }else {
                    if (shopAdapter != null){
                        shopAdapter.addPageData(shopBean.getData());
                    }
                }
                shopAdapter.setShopAllCheckboxListener(ShoppActivity.this);
            }
        });
    }

    //请求失败
    @Override
    public void failure(String msg) {
        Toast.makeText(this,msg,Toast.LENGTH_SHORT).show();
    }
    //总价按钮是否选中的回调
    @Override
    public void notifyAllCheckboxStatus() {
        StringBuilder stringBuilder = new StringBuilder();
        if (stringBuilder != null) {
            for (int i = 0; i < shopAdapter.getShoplist().size(); i++) {
                stringBuilder.append(shopAdapter.getShoplist().get(i).isSelected());
                for (int i1 = 0 ; i1 < shopAdapter.getShoplist().get(i).getList().size();i1 ++){
                    stringBuilder.append(shopAdapter.getShoplist().get(i).getList().get(i1).isSelected());
                }
            }
        }
        if (stringBuilder.toString().contains("false")){
            allCheckbox.setChecked(false);
            totalprice = 0;
        }else{
            allCheckbox.setChecked(true);
        }
        //计算总价的方法
        totalprice();
    }
    //计算总价
    private void totalprice() {
        double totalprice = 0 ;
        for (int i = 0; i < shopAdapter.getShoplist().size(); i++) {
            for (int i1 = 0; i1 < shopAdapter.getShoplist().get(i).getList().size(); i1++) {
                if (shopAdapter.getShoplist().get(i).getList().get(i1).isSelected()){
                    ShopBean.DataBean.ListBean listBean = shopAdapter.getShoplist().get(i).getList().get(i1);
                    totalprice+=listBean.getBargainPrice()*listBean.getTotalNum();
                }
            }
        }
        totalpriceTv.setText("总价:¥"+totalprice);
    }
}

ShopView

public interface ShopView {
    //请求成功
    void success(ShopBean shopBean);
    //请求失败
    void failure(String msg);
}

OKHttpUtil

public class OKHttpUtil {
    private static OKHttpUtil okHttpUtil;
    private OkHttpClient okHttpClient;
    private static final String TAG = "OKHttpUtil";
    public static OKHttpUtil getInstance() {
        if(okHttpUtil == null){
            synchronized (OKHttpUtil.class){
                if(okHttpUtil == null){
                    okHttpUtil = new OKHttpUtil();
                }
            }
        }
        return okHttpUtil;
    }

    private OKHttpUtil() {
        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        okHttpClient = new OkHttpClient
                .Builder()
                .addInterceptor(httpLoggingInterceptor)
                .connectTimeout(5,TimeUnit.SECONDS)
                .writeTimeout(5,TimeUnit.SECONDS)
                .readTimeout(5,TimeUnit.SECONDS)
                .build();
    }

    //get封装
    public void getData(String url, HashMap<String,String> params, final RequestCallback requestCallback){
        StringBuilder stringBuilder = new StringBuilder();
        String allUrl = "";
        for (Map.Entry<String, String> stringStringEntry : params.entrySet()) {
            stringBuilder.append("?").append(stringStringEntry.getKey()).append("=").append(stringStringEntry.getValue()).append("&");
        }
        allUrl = url+stringBuilder.toString().substring(0,allUrl.length()-1);
        Log.d(TAG, "getData: "+allUrl);
        final Request request = new Request.Builder()
                .url(allUrl)
                .get()
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                if(requestCallback != null){
                    requestCallback.failure(call,e);
                }
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if(requestCallback != null){
                    requestCallback.onResponse(call,response);
                }
            }
        });
    }
    //post请求
    public void postData(String url, HashMap<String,String> params, final RequestCallback requestCallback){
        FormBody.Builder builder = new FormBody.Builder();
        if(params != null && params.size()>0){
            for (Map.Entry<String, String> stringStringEntry : params.entrySet()) {
                builder.add(stringStringEntry.getKey(),stringStringEntry.getValue());
            }
        }
        final Request request = new Request.Builder()
                .url(url)
                .post(builder.build())
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                if(requestCallback != null){
                    requestCallback.failure(call,e);
                }
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if(requestCallback != null){
                    requestCallback.onResponse(call,response);
                }
            }
        });
    }
    //封装上传文件
    public void uploadFile(String url, HashMap<String, Integer> params, final RequestCallback requestCallback){
        //多表单上传的请求体对象,multipart/form-data
        MultipartBody.Builder builder = new MultipartBody.Builder();
        //设置上传类型是表单形式
        builder.setType(MultipartBody.FORM);
        for (Map.Entry<String, Integer> stringObjectEntry : params.entrySet()) {
            String key = stringObjectEntry.getKey();
            Object value = stringObjectEntry.getValue();
            if(value instanceof File){
                File file = (File) value;
                //创建文件请求体
                RequestBody requestBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
                builder.addFormDataPart(key,((File) value).getName(),requestBody);
            }else {
                builder.addFormDataPart(key, (String) value);
            }
        }
        final Request request = new Request.Builder().addHeader("", "").post(builder.build()).url(url).build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                if(requestCallback != null){
                    requestCallback.failure(call,e);
                }
                URLEncoder.encode("url");
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if(requestCallback != null){
                    requestCallback.onResponse(call,response);
                }
            }
        });
    }
    public interface RequestCallback{
        void onResponse(Call call, Response response);
        void failure(Call call, IOException e);
    }
}

ShopPresenter

public class ShopPresenter {

    private ShopModel shopModel;
    private ShopView shopView;

    public ShopPresenter(ShopView shopView) {
        shopModel= new ShopModel();
        attachView(shopView);
    }
    //绑定view到presenter
    private void attachView(ShopView shopView) {
        this.shopView = shopView;
    }

    public void getCarts(HashMap<String,String> params,String url){
        shopModel.getShop(params, url, new ShopModel.ShopCallback() {
            @Override
            public void success(ShopBean shopBean) {
                if (shopView != null){
                    shopView.success(shopBean);
                }
            }
            @Override
            public void fail(String msg) {
                if (shopView != null){
                    shopView.failure(msg);
                }
            }
        });
    }
    //解绑,避免内存泄漏
    public void detachView(){
        this.shopView = null;
    }
}

ShopModel

public class ShopModel {

    //请求购物车数据
    public void getShop(HashMap<String, String> params, String url, final ShopCallback shopCallback) {
        OKHttpUtil.getInstance().postData(url, params, new OKHttpUtil.RequestCallback() {
            @Override
            public void onResponse(Call call, Response response) {
                try {
                    String jsonResult = response.body().string();
                    if (!TextUtils.isEmpty(jsonResult)){
                        parseResult(jsonResult, shopCallback);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            @Override
            public void failure(Call call, IOException e) {
                if (shopCallback != null){
                    shopCallback.fail("网络有异常，请稍后再试");
                }
            }
        });
    }
    //解析购物车
    private void parseResult(String jsonResult, ShopCallback shopCallback) {
        ShopBean shopBean = new Gson().fromJson(jsonResult,ShopBean.class);
        if (shopCallback != null && shopBean != null){
            shopCallback.success(shopBean);
        }
    }
    public interface ShopCallback{
        //回调bean对象给presenter
        void success(ShopBean shopBean);
        //导常信息回调
        void fail(String msg);
    }
}

CheckListener

//接口回调,父与子之间的回调
public interface CheckListener {
    void notifyParent();
}

Constants

public class Constants {
    //获取购物车
    public static final String GETCARTS= "http://www.zhaoapi.cn/product/getCarts";
}

MyJIaJianView

public class MyJIaJianView extends LinearLayout{

    private TextView jiaTv,jiantv;
    private EditText numEt;
    private int num = 1;
    public MyJIaJianView(Context context) {
        this(context,null);
    }

    public MyJIaJianView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyJIaJianView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }
    //初始化自定义的布局
    private void init(Context context) {
        View view = LayoutInflater.from(context).inflate(R.layout.jia_jian_layout,this,true);
        jiantv = view.findViewById(R.id.jian);
        jiaTv = view.findViewById(R.id.jia);
        numEt = view.findViewById(R.id.num);
        numEt.setText(num+"");
        jiaTv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num++;
                numEt.setText(num+"");
                if (jiaJianListener!=null){
                    jiaJianListener.getNum(num);
                }
            }
        });
        jiantv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num--;
                if (num<=0){
                    Toast.makeText(getContext(), "数量不能小于1", Toast.LENGTH_SHORT).show();
                    num = 1;
                }
                numEt.setText(num+"");

                if (jiaJianListener!=null){
                    jiaJianListener.getNum(num);
                }
            }
        });
    }
    public void setNumEt(int n) {
        numEt.setText(n+"");
        num = Integer.parseInt(numEt.getText().toString());
    }
    private JiaJianListener jiaJianListener;
    public void setJiaJianListener(JiaJianListener jiaJianListener) {
        this.jiaJianListener = jiaJianListener;
    }
    public interface JiaJianListener{
        void getNum(int num);
    }
}

ShopAllCheckboxListener

//接口回调全选 反选
public interface ShopAllCheckboxListener {
    void notifyAllCheckboxStatus();
}

ShopBean

父类

public static class DataBean {

    //手机添加复选框状态值一级的
    private boolean isSelected = false;

    public boolean isSelected(){
        return isSelected;
    }

    public void setSelected(boolean selected){
        isSelected = selected;
    }

子类

public static class ListBean {

    //手机添加复选框状态值一级的
    private boolean isSelected = false;

    public boolean isSelected(){
        return isSelected;
    }

    public void setSelected(boolean selected){
        isSelected = selected;
    }

    //加减器的数量
    private int totalNum = 1;

    public int getTotalNum(){
        return totalNum;
    }

    public void setTotalNum(int totalNum){
        this.totalNum = totalNum;
    }

ShopAdapter

public class ShopAdapter extends RecyclerView.Adapter<ShopAdapter.ShopViewHolder> implements CheckListener,ShopAllCheckboxListener{

    private Context ccontext;
    private List<ShopBean.DataBean> shoplist;

    public ShopAdapter(Context context, List<ShopBean.DataBean> list){
        ccontext = context;
        shoplist =list;
    }

    public void addPageData(List<ShopBean.DataBean> list){
        if (shoplist != null ){
            shoplist.addAll(list);
            notifyDataSetChanged();
        }
    }

    private CheckBox allCheckbox;
    private ShopAllCheckboxListener shopAllCheckboxListener;

    //给购物车页面进行回调
    public void setShopAllCheckboxListener(ShopAllCheckboxListener shopAllCheckboxListener) {
        this.shopAllCheckboxListener = shopAllCheckboxListener;
    }

    @NonNull
    @Override
    public ShopViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(ccontext).inflate(R.layout.shop_item_layout,parent,false);
        ShopViewHolder shopViewHolder = new ShopViewHolder(itemView);
        return shopViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ShopViewHolder holder, int position) {
        final ShopBean.DataBean bean = shoplist.get(position);
        holder.nameTv.setText(bean.getSellerName());
        //根据bean里的复选框，设置选中状态
        holder.checkBox.setChecked(bean.isSelected());
        holder.productXRV.setLayoutManager(new LinearLayoutManager(ccontext));
        final ProductAdapter productAdapter = new ProductAdapter(ccontext,bean.getList());
        holder.productXRV.setAdapter(productAdapter);
        productAdapter.setCheckListener(this);
        for (int i = 0; i < bean.getList().size(); i++) {
            if (!bean.getList().get(i).isSelected()){
                holder.checkBox.setChecked(false);
            }else{
                holder.checkBox.setChecked(true);
            }
        }
        //一级列表的选中状态
        holder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (holder.checkBox.isChecked()){
                    bean.setSelected(true);
                    for (int i = 0; i < bean.getList().size(); i++) {
                        bean.getList().get(i).setSelected(true);
                    }
                }else {
                    bean.setSelected(false);
                    for (int i = 0; i < bean.getList().size(); i++) {
                        bean.getList().get(i).setSelected(false);
                    }
                }
                notifyDataSetChanged();
                if (shopAllCheckboxListener != null){
                    shopAllCheckboxListener.notifyAllCheckboxStatus();
                }
            }
        });
    }
    //修改之后的集合数据
    public List<ShopBean.DataBean> getShoplist(){
        return shoplist;
    }

    @Override
    public int getItemCount() {
        return shoplist.size() == 0 ? 0 :shoplist.size();
    }
    //刷新适配器的回调
    @Override
    public void notifyParent() {
        notifyDataSetChanged();
        if (shopAllCheckboxListener != null){
            shopAllCheckboxListener.notifyAllCheckboxStatus();
        }
    }
    //总价的全选 反选
    @Override
    public void notifyAllCheckboxStatus() {
        for (int i = 0; i < shoplist.size(); i++) {
            //父类状态
            if (!shoplist.get(i).isSelected()){
                allCheckbox.setChecked(true);
                break;
            }else {
                allCheckbox.setChecked(false);
            }
            //子类状态
            for (int i1 = 0; i1 < shoplist.get(i).getList().size(); i1++) {
                if (!shoplist.get(i).getList().get(i1).isSelected()){
                    allCheckbox.setChecked(false);
                    break;
                }
                allCheckbox.setChecked(true);
            }
        }
    }

    public class ShopViewHolder extends RecyclerView.ViewHolder {
        private CheckBox checkBox;
        private TextView nameTv;
        private RecyclerView productXRV;
        public ShopViewHolder(View itemView) {
            super(itemView);
            checkBox = itemView.findViewById(R.id.sellerCheckbox);
            nameTv = itemView.findViewById(R.id.sellerNameTv);
            productXRV = itemView.findViewById(R.id.productXRV);
        }
    }
}

ProductAdapter

public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ShopViewHolder>{

    private Context ccontext;
    private List<ShopBean.DataBean.ListBean> listBeanList;

    public ProductAdapter(Context context, List<ShopBean.DataBean.ListBean> list){
        ccontext = context;
        listBeanList =list;
    }
    //接口回调引用
    private CheckListener checkListener;
    public void setCheckListener(CheckListener checkListener) {
        this.checkListener = checkListener;
    }

    private ShopAllCheckboxListener shopAllCheckboxListener;

    public void setShopAllCheckboxListener(ShopAllCheckboxListener shopAllCheckboxListener) {
        this.shopAllCheckboxListener = shopAllCheckboxListener;
    }

    @NonNull
    @Override
    public ShopViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(ccontext).inflate(R.layout.product_item_layout,parent,false);
        ShopViewHolder shopViewHolder = new ShopViewHolder(itemView);
        return shopViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ShopViewHolder holder, int position) {
        final ShopBean.DataBean.ListBean bean = listBeanList.get(position);
        holder.priceTv.setText("优惠价:¥"+bean.getBargainPrice());
        holder.titleTv.setText(bean.getTitle());
        //分割images,得到图片数组
        String[] imgs = bean.getImages().split("\\|");
        //校验数组大小是否>0,防止空指针
        if (imgs != null && imgs.length > 0){
            Glide.with(ccontext).load(imgs[0]).into(holder.productIv);
        }else {
            holder.productIv.setImageResource(R.mipmap.ic_launcher);
        }
        holder.checkBox.setChecked(bean.isSelected());

        holder.jiajianqi.setNumEt(bean.getTotalNum());

        holder.jiajianqi.setJiaJianListener(new MyJIaJianView.JiaJianListener() {
            @Override
            public void getNum(int num) {
                bean.setTotalNum(num);
                if (checkListener != null){
                    checkListener.notifyParent();
                }
            }
        });

        //子类选中，并改变父类的状态
        holder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (holder.checkBox.isChecked()){
                    //选中
                    bean.setSelected(true);
                }else{
                    //非选中
                    bean.setSelected(false);
                }
                if (checkListener != null){
                    //刷新父类
                    checkListener.notifyParent();
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return listBeanList.size() == 0 ? 0 :listBeanList.size();
    }

    public class ShopViewHolder extends RecyclerView.ViewHolder {
        private CheckBox checkBox;
        private TextView titleTv,priceTv;
        private ImageView productIv;
        private MyJIaJianView jiajianqi;

        public ShopViewHolder(View itemView) {
            super(itemView);
            checkBox = itemView.findViewById(R.id.productCheckbox);
            titleTv = itemView.findViewById(R.id.title);
            priceTv = itemView.findViewById(R.id.price);
            productIv = itemView.findViewById(R.id.product_icon);
            jiajianqi = itemView.findViewById(R.id.jiajianqi);
        }
    }
}