List is returning one after clearing all the items by deleting

My List is returning an item after clearing all the items by deleting ,On app fresh install its returing null which is good but after adding item and then by deleting all, this happens when go back from that activity and come again, list.size() is returning 1 and an item is remaing ,i don't know if it is loading from cache object instance here is my code of adapter class

[please look to the image attached ,list is empty but still counter 1 counter = cartModelList.size()]i have a list of cart items private List<CartModel> cartModelList;

It's returning null on app fresh install which is good but when i add item to the cart and then remove all the items then its returning 1.

I mean cartmodelList.size() is returning as far I know it's returning some items from cached objects or some thing like that.

>The question is how to remove that List object cached or any alternative?

I tried on delete button but still cached coming

    public static  double p = 0;
    private List<CartModel> cartModelList;
    Database db;
    Context context;

    public CartAdapter(Context context, List<CartModel> cartModelList) {
        this.cartModelList = cartModelList;
        this.context = context;
        db = new Database(context);
    }

    @NonNull
    @Override
    public Viewholder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cart_layout_item, parent, false);
        return new Viewholder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final Viewholder holder, final int position) {


        String namee = cartModelList.get(position).getName();
        String manufacturere = cartModelList.get(position).getManufacturer();
        String availabilitye = cartModelList.get(position).getAvailability();
        String e_parte = cartModelList.get(position).getE_part();
        String m_parte = cartModelList.get(position).getM_part();
        String floatprice = cartModelList.get(position).getUnit_();
        String int_quantity = cartModelList.get(position).getQuantity();
        String float_line_total = cartModelList.get(position).getLine_total();



        holder.setItemDetails(namee, manufacturere, availabilitye, e_parte, m_parte, floatprice, int_quantity, float_line_total);


        int  checker = SharedPrefManager.getInstance(context).cartcount().getCounter();

        if (checker <= 0){

            cartModelList.clear();

        }

        holder.btn_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (db.deleteProduct(cartModelList.get(position).getID())) {
                  
                        cartModelList.remove(position);
                        notifyDataSetChanged();

                    Toast.makeText(context, "Product  deleted from cart", Toast.LENGTH_LONG).show();



                } else {

                    Toast.makeText(context, "Product not deleted from cart", Toast.LENGTH_LONG).show();

                }

                CartList user111 = new CartList(--COUNTER_BADGE);

                //  Toast.makeText(context, "else", Toast.LENGTH_SHORT).show();
                SharedPrefManager.getInstance(context).cartList(user111);
                ((Activity)context).invalidateOptionsMenu();
                ((Activity)context).finish();
                Intent intent = new Intent(context, CartActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                context.startActivity(intent);

            }



        });


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

    class Viewholder extends RecyclerView.ViewHolder {

        private TextView name;
        private TextView manufacturer;
        private TextView availability;
        private TextView e_part;
        private TextView m_part;
        private TextView price;
        private EditText quantity;
        private TextView linetotal;
        private Button btn_delete;
        private Button btn_update;
        private  Button adapter_livestock;
        public  SpinKitView progressbar;

        public Viewholder(@NonNull View itemView) {
            super(itemView);

            name = itemView.findViewById(R.id.name);
            manufacturer = itemView.findViewById(R.id.manufacturer);
            availability = itemView.findViewById(R.id.availability);
            e_part = itemView.findViewById(R.id.e_part);
            m_part = itemView.findViewById(R.id.m_part);
            price = itemView.findViewById(R.id.price);
            quantity = itemView.findViewById(R.id.quantity);
            linetotal = itemView.findViewById(R.id.linetotal);
            btn_delete = itemView.findViewById(R.id.btn_delete);
            btn_update = itemView.findViewById(R.id.btn_update);
            adapter_livestock = itemView.findViewById(R.id.adapter_livestock);
            progressbar = itemView.findViewById(R.id.adapterrprogresslivestockprogress);

        }


        private void setItemDetails(String namee, String manufacturere, String availabilitye, String e_parte, String m_parte, String floatprice, String int_quantity, String float_line_total) {

            name.setText(namee);
            manufacturer.setText(manufacturere);
            availability.setText(availabilitye);
            e_part.setText(e_parte);
            m_part.setText(m_parte);
            price.setText("£"+floatprice);
            quantity.setText(int_quantity);
            linetotal.setText("£"+float_line_total);


        }


    }

[https://i.stack.imgur.com/PxDTZ.jpg]

Okay... The first.

if (db.deleteProduct(cartModelList.get(position).getID())) 

will not delete your item from cartModelList, you need to do it manually. Like this:

if (db.deleteProduct(cartModelList.get(position).getID())) {
cartModelList.remove(position)

And the second. You have to call notifyDataSetChanged() or itemChanged or itemRemoved etc. only in the end of your deletion method. Please, tell me, if it worked.

P.S. Your items do not cached. The problem is in your code order.

Edit 1. Also, you need to check your db.deleteProduct method. Is it worked? Is your if statement worked?

Edit 2. Try this.

holder.btn_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (db.deleteProduct(cartModelList.get(position).getID())) {
cartModelList.remove(position);
notifyItemRemoved(position);
Toast.makeText(context, "Product  deleted from cart", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context, "Product not deleted from cart", Toast.LENGTH_LONG).show();
}
CartList user111 = new CartList(cartModelList.size());
//  Toast.makeText(context, "else", Toast.LENGTH_SHORT).show();
SharedPrefManager.getInstance(context).cartList(user111);
((Activity)context).invalidateOptionsMenu();
((Activity)context).finish();
Intent intent = new Intent(context, CartActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
context.startActivity(intent);
}
});

my problem is solved by putting cartModelList.clear on delete button when cartModelList.size() == 1 , so after deleting the last item it will clear the list.