Cart Related Android

1-> public interface ClickListener { void itemClick(View v, int position); } 2-> public CartAdapter(List<Order> listData, CartActivity cart, ClickListener clickListener) { this.listData = listData; this.cart = cart; this.clickListener = clickListener; } 3-> public static class MyViewHolderCart extends RecyclerView.ViewHolder { public TextView cartName; public TextView cartTotalPrice; public ImageView bagImage; public TextView quintalNo, cartBagsNo,cartBagPrice; public Button cartRemove; public TextView cartQty; public MyViewHolderCart(View itemView, final ClickListener listener) { super(itemView); cartName = (TextView) itemView.findViewById(R.id.cartt_bag_name); cartTotalPrice = (TextView) itemView.findViewById(R.id.cartt_total_priceee); bagImage = (ImageView) itemView.findViewById(R.id.cartt_img_view); quintalNo = (TextView) itemView.findViewById(R.id.cartt_quintal_no); cartBagsNo = (TextView) itemView.findViewById(R.id.cartt_bags_no); cartRemove = (Button) itemView.findViewById(R.id.cartt_remove); cartQty = (TextView) itemView.findViewById(R.id.cartt_bag_name_qty); cartBagPrice = (TextView)itemView.findViewById(R.id.cartt_price); cartRemove.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { /* quintalNo.setText(""); cartBagsNo.setText(""); cartTotalPrice.setText("");*/ listener.itemClick(v, getAdapterPosition()); } }); } } 4-> @NonNull @Override public MyViewHolderCart onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(cart); View itemview = inflater.inflate(R.layout.v_single_cart_safe, parent, false); return new MyViewHolderCart(itemview, clickListener); } private void loadListData() { cart = new Database(this).getCarts(); adapter = new CartAdapter(cart, this, new ClickListener() { @Override public void itemClick(View v, int pos) { int total = 0; int price = Integer.parseInt(cart.get(pos).getTotalPrice()); for (Order order : cart) { try { total = total + (Integer.parseInt(order.getTotalPrice())); notify(); } catch (Exception e){ e.printStackTrace(); } } new Database(CartActivity.this).deleteCartItems(cart.get(pos).getProductId()); txtTotalPrice.setText(String.valueOf(total-price)); cart.remove(pos); adapter.notifyItemRemoved(pos); } }); adapter.notifyDataSetChanged(); recycler_cart.setAdapter(adapter); //Calculate price total int total = 0; for (Order order : cart) { try { total = total + (Integer.parseInt(order.getTotalPrice())); notify(); } catch (Exception e){ e.printStackTrace(); } } Locale local = new Locale("en", "IN"); NumberFormat fmt = NumberFormat.getCurrencyInstance(local); txtTotalPrice.setText(fmt.format(total)); }
When we have the requirement that needs to perform on click for recycler item from Activity, we use this.
The Trick is:
simply create one-click listener interface and follow based on that.

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