二级购物车联动（没有结算）

最新推荐文章于 2022-11-24 16:12:11 发布

JiangMo_JM

最新推荐文章于 2022-11-24 16:12:11 发布

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CC 4.0 BY-SA版权

文章标签：二级购物车联动（没有结算）

本文链接：https://blog.youkuaiyun.com/Jang_AnGe/article/details/94433485

本文详细介绍了一个基于Android平台的购物车功能实现过程，包括商品展示、选择、价格计算及结算流程。通过自定义适配器实现了商品列表的动态更新，利用CheckBox进行商品选择状态的同步，同时介绍了如何通过监听事件来更新总价和检查选中状态。

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public class Fragment3 extends Fragment {
private RecyclerView shoppingrecycler;
private CheckBox shoppingcheck;
private TextView shoppingprice,shoppingclose;
private ShopCartPresenter shopCartPresenter;
double newsum;
private ShopCarAdapter shopCarAdapter;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment3, null, false);
shoppingrecycler = view.findViewById(R.id.shoppingrecycler);
shoppingcheck = view.findViewById(R.id.shoppingcheck);
shoppingprice = view.findViewById(R.id.shoppingprice);
shoppingclose = view.findViewById(R.id.shoppingclose);

    shopCarAdapter = new ShopCarAdapter(getContext());
    shoppingrecycler.setAdapter(shopCarAdapter);
    shoppingrecycler.setLayoutManager(new LinearLayoutManager(getContext(),LinearLayoutManager.VERTICAL,false));
    shoppingcheck.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            shopCarAdapter.checkedAll(isChecked);
            shopCarAdapter.priceAll();
            shopCarAdapter.notifyDataSetChanged();
        }
    });

    shopCarAdapter.setCall(new ShopCarAdapter.Call() {
        @Override
        public void mCall(double a, int b) {
            shoppingprice.setText(a+"");
        }
    });
    shopCarAdapter.setDataCall(new ShopCarAdapter.DataCall() {
        @Override
        public void dataCall(boolean a) {
            shoppingcheck.setChecked(a);
        }

        @Override
        public void fail(Result o) {

        }

        @Override
        public void onSuccess(Object result) {

        }
    });
    //监听

    shoppingclose.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //拿去数据看看里面有多少个选中
            //如果选中就带着数据去结算页面
            List<ShoppingChildBean> jietwolist=new ArrayList<>();
            List<ShoppingBean> jielist = shopCarAdapter.getlist();
            for (int i = 0; i < jielist.size(); i++) {
                List<ShoppingChildBean> listchild=jielist.get(i).shoppingCartList;
                for (int j = 0; j < listchild.size(); j++) {
                    if (listchild.get(j).check){
                        jietwolist.add(new ShoppingChildBean(listchild.get(j).commodityId,
                                listchild.get(j).commodityName,listchild.get(j).count, listchild.get(j).pic,
                                listchild.get(j).price,listchild.get(j).check));
                    }
                }
            }
        }
    });
    return view;
}

class shopData implements DataCall<List<ShoppingBean>> {
    @Override
    public void onSuccess(List<ShoppingBean> result, Object... args) {
        shopCarAdapter.clear();
        shopCarAdapter.addList(result);
        shopCarAdapter.notifyDataSetChanged();
    }

    @Override
    public void fail(List<ShoppingBean> shoppingBeans, Object... args) {

    }
}
@Override
public void onResume() {
    super.onResume();
    //实例化
    shopCartPresenter =new ShopCartPresenter(new shopData());
    shopCartPresenter.requestData("2231","15619455028422231");
}

}

ShopCarAdapter

public class ShopCarAdapter extends RecyclerView.Adapter<ShopCarAdapter.ViewHolder> {
private Context context;
private List list =new ArrayList<>();
public ShopCarAdapter(Context context) {
this.context = context;
}

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(context).inflate(R.layout.gwc_itme, null, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int i) {
    final ShoppingBean shopCarBean = list.get(i);
    viewHolder.checkBox.setText(list.get(i).categoryName);
    viewHolder.adapter.clear();
    viewHolder.adapter.add(shopCarBean.shoppingCartList);
    viewHolder.adapter.notifyDataSetChanged();
    viewHolder.recyclerView.setAdapter(viewHolder.adapter);
    viewHolder.checkBox.setChecked(shopCarBean.isChecked);
    viewHolder.checkBox.setTag(shopCarBean);
    viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            List<ShoppingChildBean> shoppingCartList = list.get(i).shoppingCartList;
            ShoppingBean viewTag = (ShoppingBean) v.getTag();
            CheckBox checkBox = (CheckBox) v;
            if (checkBox.isChecked()){
                viewTag.isChecked=true;
                for (int j = 0; j < shoppingCartList.size(); j++) {
                    shoppingCartList.get(j).check=checkBox.isChecked();
                }
                viewHolder.adapter.notifyDataSetChanged();
            }else {
                viewTag.isChecked=false;
                for (int j = 0; j < shoppingCartList.size(); j++) {
                    shoppingCartList.get(j).check=checkBox.isChecked();
                }
                viewHolder.adapter.notifyDataSetChanged();
            }
            priceAll();
        }

    });
    //判断二级条目中是否全部选中,如果全选中 则让一级的Checkbox选中,否则相反
    viewHolder.adapter.setShoppingData(new ShoppingRecyclerAdapter.ShoppingData() {
        @Override
        public void getData(int a) {
            if (a>list.get(i).shoppingCartList.size()){
                list.get(i).isChecked=true;
            }else {
                list.get(i).isChecked=false;
            }
            priceAll();
        }
    });
}

@Override
public int getItemCount() {
    return list.size();
}
//全选反选
public void checkedAll(boolean isChecked){
    for (int i = 0; i <list.size() ; i++) {
        list.get(i).isChecked=isChecked;
        final ShoppingBean shopCarBean = list.get(i);
        for (int j = 0; j < list.get(i).shoppingCartList.size(); j++) {
            shopCarBean.shoppingCartList.get(j).check =isChecked;
        }
    }
    notifyDataSetChanged();
}

//计算价格
public void priceAll() {
    int a=0;
    int b=0;
    double num = 0.0;
    for (int i = 0; i <list.size() ; i++) {
        final ShoppingBean shopCarBean = list.get(i);
        for (int j = 0; j < list.get(i).shoppingCartList.size(); j++) {
            b++;
            ShoppingChildBean shoppingChildBean = shopCarBean.shoppingCartList.get(j);
            if (shoppingChildBean.check) {
                num += shoppingChildBean.price * shoppingChildBean.count;
                a++;
            }
        }
    }
    if (a>=b){
        dataCall.dataCall(true);
    }else {
        dataCall.dataCall(false);
    }
    call.mCall(num,a);
    //a=0;
    notifyDataSetChanged();

}
//暴露方法
public List<ShoppingBean> getlist(){
    return list;
}

public void clear() {
    list.clear();
}

public void addList(List<ShoppingBean> result) {
    if (result!=null){
        list.addAll(result);
    }
}

public class ViewHolder extends RecyclerView.ViewHolder {

    private final CheckBox checkBox;
    private final RecyclerView recyclerView;
    ShoppingRecyclerAdapter adapter;
    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        checkBox = itemView.findViewById(R.id.check);
        recyclerView = itemView.findViewById(R.id.child_recycler);
        recyclerView.setLayoutManager(new LinearLayoutManager(context,LinearLayoutManager.VERTICAL,false));
        adapter = new ShoppingRecyclerAdapter(context);
    }
}
private Call call;

public void setCall(Call call) {
    this.call = call;
}

public interface Call{
    void mCall(double a, int b);
}

private DataCall<Collection<E>> dataCall;

public void setDataCall(DataCall<Collection<E>> dataCall) {
    this.dataCall = dataCall;
}

public interface DataCall<L extends Collection<E>> {
    void dataCall(boolean a);

    void fail(Result o);

    void onSuccess(Object result);
}

}

ShoppingRecyclerAdapter

public class ShoppingRecyclerAdapter extends RecyclerView.Adapter<ShoppingRecyclerAdapter.ViewHolder> {
private Context context;
List list = new ArrayList<>();
public ShoppingRecyclerAdapter(Context context) {
this.context = context;
}

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(context).inflate(R.layout.shopping_backgroun_item, null, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int i) {
    final ShoppingChildBean good = list.get(i);
    RequestOptions requestOptions = new RequestOptions();
    requestOptions.placeholder(R.drawable.ic_launcher_background)
            .error(R.drawable.ic_launcher_foreground);
    Glide.with(context).load(good.pic).apply(requestOptions).into(holder.image);
    holder.shoppingtext.setText(good.commodityName);
    holder.shoppingtextnum.setText(good.count + "");
    holder.shoppingrecyclerprice.setText("$" + good.price + "");
    holder.checkbox.setChecked(good.check);
    holder.checkbox.setTag(good);
    //选中
    holder.checkbox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            good.check = ((CheckBox) v).isChecked();
            //计算价格
            notifyDataSetChanged();
            isCheck();
        }
    });
    //添加
    holder.add.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            good.count++;
            good.setCount(good.count);
            //计算价格
            notifyDataSetChanged();
        }
    });
    //减少
    holder.sub.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (good.count > 1) {
                good.count--;
            } else {

            }
            //计算价格
            good.setCount(good.count);
            notifyDataSetChanged();
        }
    });
}

public void isCheck() {
    int a = 0;
    for (int i = 0; i < list.size(); i++) {
        if (list.get(i).check) {
            a++;
        }
    }
    shoppingData.getData(a);
}

//定义接口回调
public interface ShoppingData {
    void getData(int a);
}

public ShoppingData shoppingData;

public void setShoppingData(ShoppingData shoppingData) {
    this.shoppingData = shoppingData;
}

@Override
public int getItemCount() {
    return list.size();
}

public void clear() {
    list.clear();
}

public void add(List<ShoppingChildBean> shoppingCartList) {
    if (shoppingCartList != null) {
        list.addAll(shoppingCartList);
    }
}

public class ViewHolder extends RecyclerView.ViewHolder {
    CheckBox checkbox;
    ImageView image;
    TextView shoppingtext, shoppingrecyclerprice, shoppingtextnum;
    Button add, sub;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        checkbox = itemView.findViewById(R.id.checkbox);
        image = itemView.findViewById(R.id.image);
        shoppingtext = itemView.findViewById(R.id.shoppingtext);
        shoppingrecyclerprice = itemView.findViewById(R.id.shoppingrecyclerprice);
        shoppingtextnum = itemView.findViewById(R.id.shoppingtextnum);
        add = itemView.findViewById(R.id.add);
        sub = itemView.findViewById(R.id.sub);
    }
}

}