RecyclerView 하단 합계 ( FooterView)

 

리스트 변경시마다 결제 총액이 계속 변화하는 구조 

 

이벤트 감지 1) 리스트 추가 되었을 때

@Override
public void onFilterFragmentInteractionListener(ProductModel.ODS0 item) {
  if (productModels.contains(item)) {
  	return;
  }
  item.setCnt(1);
  item.setDc_rate(0);
  item.setTot_price(item.getSPRICE());
  productModels.add(item);
  productAdapter.notifyDataSetChanged();
  productAdapter.calTotal();
}

 

이벤트 감지 2) 리스트 제거 되었을 때 

String gCode = productModels.get(position).getGCODE();
productAdapter.deleteItem(position);
productAdapter.calTotal();

 

 

이벤트 감지 3) 할인율, 수량 변경되었을 때 

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

    private static final int FOOTER_VIEW = 1;
    List<ProductModel.ODS0> productModels;
    Context context;
    List<Integer> amountList;
    List<String> dcList;
    private Integer total_sum = 0;
    private OnProductListener onProductListener;

    public ProductAdapter(List<ProductModel.ODS0> productModels, Context context) {
        this.productModels = productModels;
        this.context = context;

        try {
            this.onProductListener = (OnProductListener) context;
        } catch (ClassCastException e) {
            throw new ClassCastException("Activity must implement AdapterCallback.");
        }
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        if (i == FOOTER_VIEW) {
            return new FooterViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_product_footer, viewGroup, false));
        }
        return new ViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_product, viewGroup, false));
    }

    @Override
    public int getItemViewType(int position) {

        if (position == productModels.size()) {

            return FOOTER_VIEW;
        }

        return super.getItemViewType(position);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {

        if (viewHolder instanceof FooterViewHolder) {

            FooterViewHolder holder = (FooterViewHolder) viewHolder;
            holder.product_footer_sum.setText(NumberFormat.getCurrencyInstance().format(total_sum));
            calTotal();

        } else {

            ViewHolder holder = (ViewHolder) viewHolder;
            holder.g_code.setText(productModels.get(i).getGCODE());
            holder.g_name.setText(productModels.get(i).getGNAME());
            holder.d_price.setText(NumberFormat.getCurrencyInstance().format(productModels.get(i).getSPRICE()));

            setSpinText(holder.amount, productModels.get(i).getCnt().toString());
            setSpinText2(holder.dc_rate, productModels.get(i).getDc_rate().toString());
            Integer tot = productModels.get(i).getSPRICE() * productModels.get(i).getCnt() * (100 - productModels.get(i).getDc_rate()) / 100;
            holder.tot_price.setText(NumberFormat.getCurrencyInstance().format(tot));
        }
    }

    //결제 총액 계산
    public void calTotal() {
        total_sum = 0;
        for (int k = 0; k < productModels.size(); k++) {
            total_sum += productModels.get(k).getTot_price();
        }
    }

    //수량 설정
    public void setSpinText(Spinner spin, String text) {
        for (int i = 0; i < spin.getAdapter().getCount(); i++) {
            if (spin.getAdapter().getItem(i).toString().contains(text)) {
                spin.setSelection(i);
                break;
            }
        }
    }

    //할인율 설정
    public void setSpinText2(Spinner spin, String text) {
        for (int i = 0; i < spin.getAdapter().getCount(); i++) {
            if (spin.getAdapter().getItem(i).toString().contains(text + "]")) {
                spin.setSelection(i);
                break;
            }
        }
    }

    public void deleteItem(int position) {
        productModels.remove(position);
        notifyDataSetChanged();
    }


    @Override
    public int getItemCount() {

        if (productModels == null) {
            return 0;
        }
        if (productModels.size() == 0) {
            return 1;
        }
        return productModels.size() + 1;
    }


    public interface OnProductListener {
        void onProductListener();

        void onDeleteListener(int position);
    }

    public class FooterViewHolder extends RecyclerView.ViewHolder {
        public TextView product_footer_sum;
        public Button product_footer_add;

        public FooterViewHolder(View itemView) {
            super(itemView);
            product_footer_sum = itemView.findViewById(R.id.product_footer_sum);
            product_footer_add = itemView.findViewById(R.id.product_footer_add);
            product_footer_add.setOnClickListener(v -> {
                try {
                    onProductListener.onProductListener();
                } catch (ClassCastException exception) {
                    Log.e("g", exception.getMessage());
                }
            });
        }
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        public View mView;

        public TextView g_code;
        public TextView g_name;
        public TextView d_price;
        public Spinner amount;
        public Spinner dc_rate;
        public TextView tot_price;

        public SwipeRevealLayout swipe_layout;
        public LinearLayout bottom_wrapper;
        public LinearLayout viewForeground;

        public ViewHolder(View view) {
            super(view);

            mView = itemView;
            g_code = itemView.findViewById(R.id.g_code);
            g_name = itemView.findViewById(R.id.g_name);
            d_price = itemView.findViewById(R.id.d_price);
            amount = itemView.findViewById(R.id.amount);
            dc_rate = itemView.findViewById(R.id.dc_rate);
            tot_price = itemView.findViewById(R.id.tot_price);
            viewForeground = itemView.findViewById(R.id.view_foreground);
            bottom_wrapper = itemView.findViewById(R.id.bottom_wrapper);
            swipe_layout = itemView.findViewById(R.id.swipe_layout);

            amountList = new ArrayList<>();
            for (int i = 1; i <= 10; i++) {
                amountList.add(i);
            }

            ArrayAdapter arrayAdapter = new ArrayAdapter<>(context,
                    R.layout.spinner_small_item,
                    amountList);
            amount.setAdapter(arrayAdapter);

            dcList = new ArrayList<>();

            for (int i = 0; i < discountRateModels.size(); i++) {
                dcList.add(discountRateModels.get(i).getDISCOUNTRATENM());
            }

            ArrayAdapter arrayAdapter2 = new ArrayAdapter<>(context,
                    R.layout.spinner_small_item,
                    dcList);

            dc_rate.setAdapter(arrayAdapter2);

            amount.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                    int adapterPosition = getAdapterPosition();
                    if (adapterPosition == -1)
                        return;
                    int cnt = amountList.get(i);
                    int dc_rate = productModels.get(adapterPosition).getDc_rate();
                    productModels.get(adapterPosition).setCnt(cnt);
                    productModels.get(adapterPosition)
                            .setTot_price((productModels.get(adapterPosition).getSPRICE() * cnt) * (100 - dc_rate) / 100);
                    notifyItemChanged(adapterPosition);
                    notifyItemChanged(productModels.size());
                }

                @Override
                public void onNothingSelected(AdapterView<?> adapterView) {

                }
            });

            dc_rate.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                    int adapterPosition = getAdapterPosition();
                    if (adapterPosition == -1)
                        return;

                    int cnt = productModels.get(adapterPosition).getCnt();
                    int dc_rate = discountRateModels.get(i).getDISCOUNTRATE();

                    productModels.get(adapterPosition).setDc_rate(dc_rate);
                    productModels.get(adapterPosition)
                            .setTot_price(productModels.get(adapterPosition).getSPRICE() * cnt * (100 - dc_rate) / 100);
                    notifyItemChanged(adapterPosition);
                    notifyItemChanged(productModels.size());
                }

                @Override
                public void onNothingSelected(AdapterView<?> adapterView) {

                }
            });

            swipe_layout.setDragEdge(SwipeRevealLayout.DRAG_EDGE_RIGHT);
            swipe_layout.setSwipeListener(new SwipeRevealLayout.SwipeListener() {
                @Override
                public void onClosed(SwipeRevealLayout view) {
                }

                @Override
                public void onOpened(SwipeRevealLayout view) {
                }

                @Override
                public void onSlide(SwipeRevealLayout view, float slideOffset) {
                }
            });

            //스와이프 후 삭제 버튼
            bottom_wrapper.setOnClickListener(view1 -> {
                swipe_layout.postDelayed(() -> swipe_layout.close(true), 50);

                try {
                    onProductListener.onDeleteListener(getAdapterPosition());

                } catch (ClassCastException exception) {
                    Log.e("g", exception.getMessage());
                }

            });

        }
    }
}

 

 

 

RecyclerView Row 

<com.chauthai.swipereveallayout.SwipeRevealLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/swipe_layout"
    app:dragEdge="right"
    app:mode="same_level"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/app_white">

    <LinearLayout
        android:id="@+id/bottom_wrapper"
        android:layout_width="100dp"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:background="#f00"
        android:gravity="center"
        android:orientation="horizontal">

        <ImageView
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/baseline_delete_forever_black_18dp"
            android:tint="@color/app_white" />

    </LinearLayout>

    <LinearLayout
        android:id="@+id/view_foreground"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/app_white"
        android:orientation="horizontal"
        android:paddingLeft="20dp"
        android:paddingTop="8dp"
        android:paddingBottom="8dp"
        android:weightSum="10">

        <TextView
            android:id="@+id/g_code"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.8"
            android:ellipsize="end"
            android:gravity="left|center_vertical"
            android:textColor="@color/app_black"
            android:textSize="@dimen/list_small_font" />

        <TextView
            android:id="@+id/g_name"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_toRightOf="@id/g_code"
            android:layout_weight="2.5"
            android:gravity="center"
            android:textColor="@color/app_black"
            android:textSize="10sp" />

        <TextView
            android:id="@+id/d_price"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="30dp"
            android:layout_toRightOf="@id/g_name"
            android:layout_weight="1.5"
            android:ellipsize="end"
            android:gravity="center"
            android:paddingLeft="30dp"
            android:textColor="@color/app_black"
            android:textSize="@dimen/list_small_font" />

        <Spinner
            android:id="@+id/amount"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="20dp"
            android:layout_weight="1"
            android:background="@drawable/spinner_small_list_bg"
            android:gravity="center"
            android:textSize="10sp" />

        <Spinner
            android:id="@+id/dc_rate"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.5"
            android:background="@drawable/spinner_small_list_bg"
            android:gravity="center"
            android:textSize="10sp" />

        <TextView
            android:id="@+id/tot_price"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1.4"
            android:ellipsize="end"
            android:gravity="right|center_vertical"
            android:textColor="@color/app_black"
            android:textSize="@dimen/list_small_font" />
    </LinearLayout>

</com.chauthai.swipereveallayout.SwipeRevealLayout>

 

 

fragment_product_footer

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/view_foreground"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/app_white"
    android:orientation="vertical"
    android:paddingBottom="@dimen/small_font"
    android:paddingTop="@dimen/small_font">

    <Button
        android:id="@+id/product_footer_add"
        style="@style/ButtonStyle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:layout_marginRight="0dp"
        android:paddingTop="0dp"
        android:paddingBottom="0dp"
        android:text="제 품 추 가" />

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

        <View
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="7"
            android:visibility="invisible" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.5"
            android:gravity="right"
            android:text="결제 총액"
            android:textColor="@color/app_black" />

        <TextView
            android:paddingRight="22.5dp"
            android:id="@+id/product_footer_sum"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1.5"
            android:ellipsize="end"
            android:gravity="right|center_vertical"
            android:textColor="@color/app_black"
            android:textSize="@dimen/list_small_font" />
    </LinearLayout>
</LinearLayout>