Android使用RecyclerView完成简单购物车

痛定思痛。 2023-10-05 08:34 4阅读 0赞

### 购物车 ###

这里博主使用的是MVP+万能适配器

话不多说,直接代码

实体类

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 {
        
    		//这个用来计算选中的数量
            private int selectNum = 0;
            //判断是否选中
            private boolean isClick;
    
            public int getSelectNum() {
        
                return selectNum;
            }
    
            public void setSelectNum(int selectNum) {
        
                this.selectNum = selectNum;
            }
    
            public boolean isClick() {
        
                return isClick;
            }
    
            public void setClick(boolean click) {
        
                isClick = click;
            }
    
            private String id;
            private String title;
            private String pic;
            private String collect_num;
            private String food_str;
            private int num;
    
            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;
            }
    
            @Override
            public String toString() {
        
                return "DataBean{" +
                        "id='" + id + '\'' +
                        ", title='" + title + '\'' +
                        ", pic='" + pic + '\'' +
                        ", collect_num='" + collect_num + '\'' +
                        ", food_str='" + food_str + '\'' +
                        ", num=" + num +
                        '}';
            }
        }
    
        @Override
        public String toString() {
        
            return "FoodEntity{" +
                    "ret=" + ret +
                    ", data=" + data +
                    '}';
        }

万能适配器

public class ShopCarAdapter extends BaseQuickAdapter<FoodEntity.DataBean, BaseViewHolder> {
        
    
        public ShopCarAdapter(int layoutResId, @Nullable List<FoodEntity.DataBean> data) {
        
            super(layoutResId, data);
        }
    
        @Override
        protected void convert(BaseViewHolder helper, FoodEntity.DataBean item) {
        
    
            //设置数据
            helper.setText(R.id.item_car_title,item.getTitle()+"");
            helper.setText(R.id.item_car_price,item.getNum()+"");
            helper.setText(R.id.item_car_num,item.getSelectNum()+"");
            GlideUtils.getInstance().CommonGlide(mContext,item.getPic(),helper.getView(R.id.item_car_iv));
    
            //添加点击事件
            helper.addOnClickListener(R.id.item_car_btn_add);
            helper.addOnClickListener(R.id.item_car_btn_delete);
            helper.addOnClickListener(R.id.item_car_btn_subtract);
            helper.addOnClickListener(R.id.item_car_cb_check);
    
            //设置是否选中
            boolean isClick = item.isClick();
            CheckBox checkBox = helper.getView(R.id.item_car_cb_check);
            if(isClick) {
        
                checkBox.setChecked(true);
            } else {
        
                checkBox.setChecked(false);
            }
    
        }
    }

子布局文件

这是主页面

public class FavoriteFragment extends BaseFragment<FoodPresenter> implements FoodContract.View {
        
    
        @BindView(R.id.fra_favoriter_rv)
        RecyclerView fraFavoriterRv;
        @BindView(R.id.fra_favoriter_checkAll)
        CheckBox fraFavoriterCheckAll;
        @BindView(R.id.fra_favoriter_btn_clear)
        Button fraFavoriterBtnClear;
        @BindView(R.id.fra_favoriter_tv_allMoney)
        TextView fraFavoriterTvAllMoney;
    
        private ShopCarAdapter shopCarAdapter;
        private List<FoodEntity.DataBean> list_food = new ArrayList<>();
    
        //用来计算总价
        private float allMoney = 0.0f;
    
        @Override
        public int bindLayout() {
        
            return R.layout.fragment_favoriter;
        }
    
        @Override
        public void initView() {
        
            EventBus.getDefault().register(this);
            //设置布局样式
            fraFavoriterRv.setLayoutManager(new LinearLayoutManager(getActivity()));
            //添加分割线
            fraFavoriterRv.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL));
            //设置删除动画
            DefaultItemAnimator defaultItemAnimator = new DefaultItemAnimator();
            defaultItemAnimator.setRemoveDuration(1000);
            fraFavoriterRv.setItemAnimator(defaultItemAnimator);
    
            //设置侧滑删除和上下交换
            ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
        
                //允许拖动的方向
                @Override
                public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
        
                    return makeMovementFlags(ItemTouchHelper.UP|ItemTouchHelper.DOWN,ItemTouchHelper.RIGHT);
                }
    
                //上下拖动
                @Override
                public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
        
                    int adapterPosition = viewHolder.getAdapterPosition();
                    int adapterPosition1 = target.getAdapterPosition();
                    //利用提供的排序进行交换
                    Collections.swap(list_food,adapterPosition,adapterPosition1);
                    //刷新适配器,注意要刷新指定交换位置
                    shopCarAdapter.notifyItemMoved(adapterPosition,adapterPosition1);
                    return true;
                }
    
                //侧滑删除
                @Override
                public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
        
                    int adapterPosition = viewHolder.getAdapterPosition();
                    list_food.remove(adapterPosition);
                    //刷新适配器,只刷新删除位置
                    shopCarAdapter.notifyItemRemoved(adapterPosition);
                }
            });
            //绑定对应recyclerView
            itemTouchHelper.attachToRecyclerView(fraFavoriterRv);
    
        }
    
        @Override
        public void initInject() {
        
            DaggerFoodCompontent.builder().foodModules(new FoodModules(this, new FoodModel())).build().injectMainActivity(this);
        }
    
        @Override
        public void initData() {
        
            if (mPresenter != null) {
        
                mPresenter.selectData(1, 20, 1);
            } else {
        
                LogUtils.log_i("mPresenter" + mPresenter);
            }
        }
    
        @Override
        public void initAdapter(List<FoodEntity.DataBean> dataBeans) {
        
    
            //定义一个全局的集合,用于下面的计算
            list_food.addAll(dataBeans);
    
            //初始化适配器
            if (shopCarAdapter == null) {
        
                shopCarAdapter = new ShopCarAdapter(R.layout.item_car_layout, list_food);
                fraFavoriterRv.setAdapter(shopCarAdapter);
                initShopCar();
            }
    
        }
    
        private void initShopCar() {
        
    
            shopCarAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {
        
                @Override
                public void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {
        
                    int id = view.getId();
                    switch (id) {
        
                        case R.id.item_car_btn_add:
                            int selectNum = list_food.get(position).getSelectNum();
                            selectNum++;
                            LogUtils.log_i(selectNum+"");
                            list_food.get(position).setSelectNum(selectNum);
                            shopCarAdapter.notifyDataSetChanged();
                            break;
                        case R.id.item_car_btn_subtract:
                            int num = list_food.get(position).getSelectNum();
                            if(num > 0) {
        
                                num--;
                                list_food.get(position).setSelectNum(num);
                                shopCarAdapter.notifyDataSetChanged();
                            }
                            break;
                        case R.id.item_car_btn_delete:
                            list_food.remove(position);
                            shopCarAdapter.notifyItemRemoved(position);
                            break;
                        case R.id.item_car_cb_check:
                            boolean click = list_food.get(position).isClick();
                            list_food.get(position).setClick(!click);
                            break;
                    }
                    computeMoney();
                }
            });
        }
    
        //计算价格
        private void computeMoney() {
        
            //防止重复累加
            allMoney = 0.0f;
            //利用循环遍历,判断是否有选中的,然后计算价格,进行累加
            for (FoodEntity.DataBean dataBean : list_food) {
        
                boolean click = dataBean.isClick();
                if(click) {
        
                    //用这个类型来代替价格
                    float price = dataBean.getNum();
                    int selectNum = dataBean.getSelectNum();
                    float singlePrice = price * selectNum;
                    //累加总价
                    allMoney+=singlePrice;
                }
            }
    
            fraFavoriterTvAllMoney.setText(allMoney+"");
    
        }
    
        @OnClick({
        R.id.fra_favoriter_checkAll, R.id.fra_favoriter_btn_clear})
        public void onViewClicked(View view) {
        
            switch (view.getId()) {
        
                case R.id.fra_favoriter_checkAll:
                    //全选
                    for (FoodEntity.DataBean dataBean : list_food) {
        
                        dataBean.setClick(!dataBean.isClick());
                    }
                    computeMoney();
                    shopCarAdapter.notifyDataSetChanged();
                    break;
                case R.id.fra_favoriter_btn_clear:
    
                    break;
            }
        }
    }