购物车-整体页面逻辑

MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    String url = "http://www.zhaoapi.cn/product/getCarts";
    private ExpandableListView el_cart;
    private CheckBox cb_cart_all_select;
    private TextView tv_cart_total_price;
    private Button btn_cart_pay;
    MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        initData();
    }

    private void initData() {

        HashMap<String, String> map = new HashMap<>();
        map.put("uid","71");
        OkhtttpUtils.getInstance().doPost(url, map, new OkhtttpUtils.OkCallback() {
            @Override
            public void onFailure(Exception e) {

            }

            @Override
            public void onResponse(String json) {

                CartInfo cartInfo = new Gson().fromJson(json, CartInfo.class);
                if ("0".equals(cartInfo.getCode())){
                    List<CartInfo.DataBean> data = cartInfo.getData();
                    adapter = new MyAdapter(data);
                    el_cart.setAdapter(adapter);

                    //展开二级列表
                    for(int x=0; x<data.size(); x++){
                        el_cart.expandGroup(x);
                    }

                    adapter.setOnCartListChangeListener(new MyAdapter.onCartListChangeListener() {
                        @Override
                        public void onSellerCheckedChange(int i) {

                            //商家被点击
                            boolean currentSellerAllProductSelected = adapter.isCurrentSellerAllProductSelected(i);
                            adapter.changeCurrentSellerAllProductsStatus(i, !currentSellerAllProductSelected);
                            adapter.notifyDataSetChanged();
                            //B.刷新底部数据
                            refreshSelectedAndTotalPriceAndTotalNumber();
                        }

                        @Override
                        public void onProductCheckedChange(int i, int i1) {

                            //点击商品得checkbox
                            adapter.changeCurrentProductStatus(i,i1);
                            adapter.notifyDataSetChanged();
                            //B.刷新底部数据
                            refreshSelectedAndTotalPriceAndTotalNumber();
                        }

                        @Override
                        public void onProducNumberChange(int i, int i1, int number) {

                            //当加减被点击
                            adapter.changeCurrentProductNumber(i,i1,number);
                            adapter.notifyDataSetChanged();
                            //B.刷新底部数据
                            refreshSelectedAndTotalPriceAndTotalNumber();
                        }
                    });
                }
            }
        });
    }

    //B.刷新checkbox状态和总价和总数量
    private void refreshSelectedAndTotalPriceAndTotalNumber() {
        //去判断是否所有得商品都被选中
        boolean allProductsSelected = adapter.isAllProductsSelected();
        //设置给全选checkBox
        cb_cart_all_select.setChecked(allProductsSelected);

        //计算总价
        float totalPrice = adapter.calculateTotalPrice();
        tv_cart_total_price.setText("总价 " + totalPrice);

        //计算总数量
        int totalNumber = adapter.calculateTotalNumber();
        btn_cart_pay.setText("去结算(" + totalNumber + ")");
    }

    //初始化的操作
    private void initView() {
        el_cart = (ExpandableListView) findViewById(R.id.el_cart);
        cb_cart_all_select = (CheckBox) findViewById(R.id.cb_cart_all_select);
        tv_cart_total_price = (TextView) findViewById(R.id.tv_cart_total_price);
        btn_cart_pay = (Button) findViewById(R.id.btn_cart_pay);

        cb_cart_all_select.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()){
            case R.id.cb_cart_all_select:

                //底部全选按钮
                //时候所有得商品都被选中
                boolean allProductsSelected = adapter.isAllProductsSelected();
                adapter.changeAllProductStatus(!allProductsSelected);
                adapter.notifyDataSetChanged();
                //刷新底部数据
                refreshSelectedAndTotalPriceAndTotalNumber();
                break;
        }
    }
}

MyAdapter.java

public class MyAdapter extends BaseExpandableListAdapter{

    private List<CartInfo.DataBean> list;
    public MyAdapter(List<CartInfo.DataBean> data) {
        list=data;
    }

    @Override
    public int getGroupCount() {
        return list==null ? 0 : list.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return list.get(i).getList()==null ? 0 :list.get(i).getList().size();
    }

    @Override
    public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {

        //先拿到Bean里组的数据,看hiJson
        CartInfo.DataBean dataBean = list.get(i);
        ParentViewHolder parentViewHolder;
        if (view == null) {
            view = View.inflate(viewGroup.getContext(), R.layout.item_cart_parent, null);
            parentViewHolder = new ParentViewHolder(view);
            view.setTag(parentViewHolder);
        } else {
            parentViewHolder = (ParentViewHolder) view.getTag();
        }
        parentViewHolder.seller_name_tv.setText(dataBean.getSellerName());

        boolean currentSellerAllProductSelected = isCurrentSellerAllProductSelected(i);
        parentViewHolder.seller_cb.setChecked(currentSellerAllProductSelected);

        //D.设置点击CheckBox
        parentViewHolder.seller_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnCartListChangeListener !=null){
                    mOnCartListChangeListener.onSellerCheckedChange(i);
                }
            }
        });
        return view;
    }


    @Override
    public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {

        CartInfo.DataBean dataBean = list.get(i);
        List<CartInfo.DataBean.ListBean> list1 = dataBean.getList();
        CartInfo.DataBean.ListBean listBean = list1.get(i1);
        ChildViewHolder childViewHolder;


        if (view == null) {
            view = View.inflate(viewGroup.getContext(), R.layout.item_cart_child, null);
            childViewHolder = new ChildViewHolder(view);
            view.setTag(childViewHolder);
        } else {
            childViewHolder=(ChildViewHolder)view.getTag();
        }
        //设置商品名字
        childViewHolder.product_title_name_tv.setText(listBean.getTitle());
        //设置商品单价
        childViewHolder.product_price_tv.setText(listBean.getPrice()+"");
        //设置复选框是否选中
        childViewHolder.child_cb.setChecked(listBean.getSelected() == 1);

        //设置组合式自定义控件内部的数量
        childViewHolder.add_remove_view.setNumber(listBean.getNum());

        //D.设置商品CheckBox的点击事件,通过接口回调,暴露给外面
        childViewHolder.child_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnCartListChangeListener != null){
                    mOnCartListChangeListener.onProductCheckedChange(i,i1);
                }
            }
        });

        //D.设置商品数量的点击事件,通过接口回调,暴露给外面
        childViewHolder.add_remove_view.setOnNumberChangeListener(new AddSubView.OnNumberChangeListener() {
            @Override
            public void onNumberChange(int num) {
                if (mOnCartListChangeListener !=null){
                    mOnCartListChangeListener.onProducNumberChange(i,i1,num);
                }
            }
        });
        return view;
    }

    public boolean isCurrentSellerAllProductSelected(int i){//根据商品改变商家--如果商品全部选中商家则选中--有一个商品没选中则商家不选中
        CartInfo.DataBean dataBean = list.get(i);
        List<CartInfo.DataBean.ListBean> beans = dataBean.getList();
        for (CartInfo.DataBean.ListBean bean : beans){

            if (bean.getSelected()==0){
                return false;
            }

        }
               return true;
    }

    public boolean isAllProductsSelected(){ //根据商品改变全选--如果商品全部选中全选则选中--有一个商品没选中则全选不选中
        for (int x=0;x<list.size();x++){
            CartInfo.DataBean dataBean = list.get(x);
            List<CartInfo.DataBean.ListBean> list1 = dataBean.getList();
            for (int j=0;j<list1.size();j++){
                if (list1.get(j).getSelected()==0){
                    return false;
                }
            }
        }
        return true;
    }

    public int calculateTotalNumber(){ //计算总数量
        int totalNumber=0;
        for (int i=0;i<list.size();i++){
            CartInfo.DataBean dataBean = list.get(i);
            List<CartInfo.DataBean.ListBean> list1 = dataBean.getList();
            for (int j=0;j<list1.size();j++){
                if (list1.get(j).getSelected()==1){
                    int num = list1.get(j).getNum();

                    totalNumber+=num;
                }
            }
        }

        return totalNumber;
    }


    public float calculateTotalPrice(){  //获取总价
        float totalPrice=0;
        for (int i=0;i<list.size();i++){
            CartInfo.DataBean dataBean = list.get(i);
            List<CartInfo.DataBean.ListBean> list = dataBean.getList();
            for (int j=0;j<list.size();j++){
                if (list.get(j).getSelected()==1){
                    float price = list.get(j).getPrice();
                    int num = list.get(j).getNum();
                    totalPrice+=price*num;
                }
            }
        }
        return totalPrice;
    }
    //C.当商品组的全选框点击时,更新所有商品的状态
    public void changeCurrentSellerAllProductsStatus(int i,boolean isSelected){

        CartInfo.DataBean dataBean = list.get(i);
        List<CartInfo.DataBean.ListBean> beans = dataBean.getList();
        for (int j=0;j<beans.size();j++){
            CartInfo.DataBean.ListBean bean = beans.get(j);
            bean.setSelected(isSelected ?1 :0);
        }
    }

    //C.当商家子条目的全选框选中时,更新其状态
    public void changeCurrentProductStatus(int i , int i1){
        CartInfo.DataBean dataBean = list.get(i);
        List<CartInfo.DataBean.ListBean> list = dataBean.getList();
        CartInfo.DataBean.ListBean listBean = list.get(i1);
        listBean.setSelected(listBean.getSelected() == 0 ? 1 : 0 );

    }
    //C.设置所有商品的状态
    public void changeAllProductStatus(boolean selected){
        for(int x=0; x<list.size() ; x++){
            CartInfo.DataBean dataBean = list.get(x);
            List<CartInfo.DataBean.ListBean> list = dataBean.getList();
            for(int j=0; j<list.size(); j++){
                list.get(j).setSelected(selected ? 1 : 0);
            }
        }
    }

    //C.当加减器被点击时,调用,改变里面当前商品的数量  参数1定位那个商家   参数2定位哪个商品  参数3定位改变具体的数量是多少
    public void changeCurrentProductNumber(int i,int i1,int number){
        CartInfo.DataBean dataBean = list.get(i);
        List<CartInfo.DataBean.ListBean> list = dataBean.getList();
        CartInfo.DataBean.ListBean listBean = list.get(i1);
        listBean.setNum(number);
    }

    public interface onCartListChangeListener{
        /**
         * 当商家的checkBox点击时回调
         */
        void onSellerCheckedChange(int i);

        /**
         * 当点击子条目商品的CheckBox回调
         */
        void onProductCheckedChange(int i ,int i1);

        /**
         * 当点击加减按钮的回调
         */
        void onProducNumberChange(int i , int i1 , int number);

    }
    //D.
    onCartListChangeListener mOnCartListChangeListener;
    //D.
    public void setOnCartListChangeListener(onCartListChangeListener onCartListChangeListener){
        mOnCartListChangeListener = onCartListChangeListener ;
    }

    public static class ParentViewHolder {
        public CheckBox seller_cb;
        public TextView seller_name_tv;

        public ParentViewHolder(View rootView) {
            this.seller_cb = (CheckBox) rootView.findViewById(R.id.seller_cb);
            this.seller_name_tv = (TextView) rootView.findViewById(R.id.seller_name_tv);
        }
    }

    public static class ChildViewHolder {
        public CheckBox child_cb;
        public ImageView product_icon_iv;
        public TextView product_title_name_tv;
        public TextView product_price_tv;
        public AddSubView add_remove_view;

        public ChildViewHolder(View rootView) {
            this.child_cb = (CheckBox) rootView.findViewById(R.id.child_cb);
            this.product_icon_iv = (ImageView) rootView.findViewById(R.id.product_icon_iv);
            this.product_title_name_tv = (TextView) rootView.findViewById(R.id.product_title_name_tv);
            this.product_price_tv = (TextView) rootView.findViewById(R.id.product_price_tv);
            this.add_remove_view = (AddSubView) rootView.findViewById(R.id.add_remove_view);
        }
    }

    @Override
    public Object getGroup(int i) {
        return null;
    }

    @Override
    public Object getChild(int i, int i1) {
        return null;
    }

    @Override
    public long getGroupId(int i) {
        return 0;
    }

    @Override
    public long getChildId(int i, int i1) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }


    @Override
    public boolean isChildSelectable(int i, int i1) {
        return false;
    }
}

activity_main.xml

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

    <ExpandableListView
        android:id="@+id/el_cart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="60dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:background="#eeeeee"
        android:gravity="center_vertical">

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

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全选" />

        <TextView
            android:id="@+id/tv_cart_total_price"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingLeft="20dp"
            android:text="合计:¥0.00" />

        <Button
            android:id="@+id/btn_cart_pay"
            android:layout_width="100dp"
            android:layout_height="match_parent"
            android:text="去结算(0)" />
    </LinearLayout>

</RelativeLayout>

AddSubView.java

public class AddSubView extends LinearLayout implements View.OnClickListener{    //组合式控件
    private int number = 1;
    private TextView sub_tv;
    private TextView product_number_tv;
    private TextView add_tv;

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

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

    public AddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        View view = inflate(context, R.layout.add_remove, this);

        sub_tv=view.findViewById(R.id.sub_tv);
        product_number_tv=view.findViewById(R.id.product_number_tv);
        add_tv=view.findViewById(R.id.add_tv);


        sub_tv.setOnClickListener(this);
        add_tv.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){

            case R.id.sub_tv:

                if (number>1){
                    --number;
                    product_number_tv.setText(number+"");
                    if (onNumberChangeListener!=null){
                        onNumberChangeListener.onNumberChange(number);
                    }
                }else {
                    Toast.makeText(getContext(), "不能再少了", Toast.LENGTH_SHORT).show();
                }
                break;

            case R.id.add_tv:

                if (number<8){
                    ++number;
                    product_number_tv.setText(number+"");
                    if (onNumberChangeListener!=null){
                        onNumberChangeListener.onNumberChange(number);
                    }
                }else {
                    Toast.makeText(getContext(), "不能再多了", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
        product_number_tv.setText(number + "");
    }

    OnNumberChangeListener onNumberChangeListener;

    public void setOnNumberChangeListener(OnNumberChangeListener onNumberChangeListener) {
        this.onNumberChangeListener = onNumberChangeListener;
    }

    interface OnNumberChangeListener {
        void onNumberChange(int num);
    }
}

add_remove.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="2dp"
    android:layout_marginLeft="10dp"
    android:layout_width="60dp"
    android:layout_height="30dp"
    android:layout_gravity="center_vertical"
    android:background="#99000000"
    android:gravity="center_vertical">

    <TextView
        android:background="#ffffff"
        android:layout_weight="1"
        android:id="@+id/sub_tv"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="-"
        android:textSize="16sp" />

    <TextView
        android:text="1"
        android:layout_marginLeft="2dp"
        android:background="#ffffff"
        android:layout_weight="1"
        android:id="@+id/product_number_tv"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:gravity="center"
        />

    <TextView
        android:layout_marginLeft="2dp"
        android:background="#ffffff"
        android:layout_weight="1"
        android:id="@+id/add_tv"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="+"
        android:textSize="16sp" />

</LinearLayout>

item_cart_parent.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     //商家条目
    android:layout_width="match_parent"
    android:layout_height="60dp"
    android:gravity="center_vertical"
    >


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

    <TextView
        android:id="@+id/seller_name_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp" />
</LinearLayout>

item_cart_child.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    android:gravity="center_vertical">

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

    <ImageView
        android:id="@+id/product_icon_iv"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginLeft="20dp"
        android:scaleType="centerCrop"
        android:src="@color/colorPrimary" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:id="@+id/product_title_name_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:maxLines="2"
            android:text="商品标题" />

        <TextView
            android:id="@+id/product_price_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="¥0.0" />
    </LinearLayout>

    <fanruiqi.bwie.com.shopcat.AddSubView
        android:id="@+id/add_remove_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp" />
</LinearLayout>

OkHttpUtils.java

public class OkhtttpUtils {
    private static OkhtttpUtils mOkhtttpUtils;
    private OkHttpClient mOkHttpClien;
    private final Handler mHandler;

    private OkhtttpUtils() {

        //创建一个主线程的handler
        mHandler = new Handler(Looper.getMainLooper());
        mOkHttpClien = new OkHttpClient.Builder()
                .connectTimeout(5000, TimeUnit.MILLISECONDS)
                .readTimeout(5000, TimeUnit.MILLISECONDS)
                .writeTimeout(5000, TimeUnit.MILLISECONDS)
                .build();
    }

    //单例模式
    public static OkhtttpUtils getInstance() {
        if (mOkhtttpUtils == null) {
            synchronized (OkhtttpUtils.class) {
                if (mOkhtttpUtils == null) {
                    return mOkhtttpUtils = new OkhtttpUtils();
                }
            }
        }
        return mOkhtttpUtils;
    }

    public interface OkCallback {
        void onFailure(Exception e);
        void onResponse(String json);
    }


    public void doPost(String url, Map<String, String> map, final OkCallback okCallback) {
        //创建FormBody的对象,把表单添加到formBody中
        FormBody.Builder builder = new FormBody.Builder();
        if (map != null) {
            for (String key : map.keySet()) {
                builder.add(key, map.get(key));
            }
        }
        FormBody formBody = builder.build();

        //创建Request对象
        Request request = new Request.Builder()
                .post(formBody)
                .url(url)
                .build();
        //创建Call对象
        final Call call = mOkHttpClien.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                if (okCallback != null) {
                    //切换到主线程
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            okCallback.onFailure(e);
                        }
                    });
                }
            }
            @Override
            public void onResponse(Call call, final Response response) throws IOException {
                try {
                    if (response != null && response.isSuccessful()) {
                        final String json = response.body().string();
                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                if (okCallback != null) {
                                    okCallback.onResponse(json);
                                    return;
                                }
                            }
                        });
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (okCallback != null) {
                    okCallback.onFailure(new Exception("网络异常"));
                }
            }
        });
    }




    //封装doGet的网络请求
    public void doGet(String url, final OkCallback okCallback) {
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();

        final Call call = mOkHttpClien.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                if (okCallback != null) {
                    //切换到主线程
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            okCallback.onFailure(e);
                        }
                    });
                }
            }

            @Override
            public void onResponse(Call call, final Response response) throws IOException {

                try {
                    if (response != null && response.isSuccessful()) {
                        final String json = response.body().string();
                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                if (okCallback != null) {
                                    okCallback.onResponse(json);
                                    return;
                                }

                            }
                        });
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
    }

}