نمایش قیمت نهایی سبد خرید!

سلام.من یک ریسایکرویو دارم ک لیست محصولات مورد نظر رو با قیمت پایه نشون میده و کاربر تعداد مورد نظرش رو وارد میکنه و قیمت هر محصول با توجه به تعدادش محاسبه میشه.حالا چطور میتونم این مقادیرو باهم جمع کنم و نمایش بدم...ممنون

آداپتر

 package navosh.shaidi.radstore.adapter;

import android.annotation.SuppressLint;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.makeramen.roundedimageview.RoundedImageView;
import com.squareup.picasso.Picasso;
import java.util.List;
import navosh.shaidi.radstore.R;
import navosh.shaidi.radstore.api.ApiService;
import navosh.shaidi.radstore.model.CartModel;

public class AdapterCart extends RecyclerView.Adapter<AdapterCart.cViewHolder> {


 private Context context;
 private List<CartModel> cartModels;

 public AdapterCart(Context context, List<CartModel> cartModels) {
 this.context = context;
 this.cartModels = cartModels;
 }

 @NonNull
 @Override
 public cViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
 View v = LayoutInflater.from(context).inflate(R.layout.item_cart, parent, false);
 return new cViewHolder(v);
 }

 @SuppressLint("SetTextI18n")
 @Override
 public void onBindViewHolder(@NonNull final cViewHolder holder, final int position) {
 final CartModel cartModel = cartModels.get(position);
 final String id = cartModel.getId();
 final String name_product = cartModel.getName_product();
 final String price_product = cartModel.getPrice_product();
 final String image_product = cartModel.getImage_product();

 Picasso.with(context).load(image_product).into(holder.img_cart);

 holder.txt_name_cart.setText(name_product);
 holder.txt_price_cart.setText(price_product);
 holder.txt_final_price_cart.setText(price_product +" تومان");




 holder.img_inc.setOnClickListener(new View.OnClickListener() {
 @SuppressLint("SetTextI18n")
 @Override
 public void onClick(View view) {
 int current_count = Integer.parseInt(holder.txt_count_item.getText().toString());
 holder.txt_count_item.setText(current_count + 1 +"");
 int count =Integer.parseInt(holder.txt_count_item.getText().toString());
 int price1 = Integer.parseInt(holder.txt_price_cart.getText().toString());
 holder.txt_final_price_cart.setText( price1 * count +" تومان");

 }
 });

 holder.img_dec.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 int count = Integer.parseInt(holder.txt_count_item.getText().toString());
 if (count>1){
 holder.txt_count_item.setText(count - 1 +"");
 int price1 = Integer.parseInt(holder.txt_price_cart.getText().toString());
 holder.txt_final_price_cart.setText(price1 * Integer.parseInt(holder.txt_count_item.getText().toString() )+" تومان");
 }
 }
 });

 holder.txt_remove.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 myCallBackCart.onItemClicked(id);
 cartModels.remove(position);
 notifyItemRemoved(position);
 notifyItemRangeRemoved(position, cartModels.size());
 }
 });


 }


 private MyCallBackCart myCallBackCart;

 public void setId_cart(MyCallBackCart myCallBackCart) {
 this.myCallBackCart = myCallBackCart;
 }

 public interface MyCallBackCart {
 void onItemClicked(String id);
 }
 
 @Override
 public int getItemCount() {
 return cartModels.size();
 }

 public class cViewHolder extends RecyclerView.ViewHolder {

 TextView txt_name_cart, txt_price_cart, txt_remove ,txt_count_item,txt_final_price_cart;
 RoundedImageView img_cart;
 ImageView img_inc,img_dec;

 public cViewHolder(@NonNull View itemView) {
 super(itemView);
 txt_name_cart = itemView.findViewById(R.id.txt_name_cart);
 txt_price_cart = itemView.findViewById(R.id.txt_price_cart);
 img_cart = itemView.findViewById(R.id.img_main_cart);
 txt_remove = itemView.findViewById(R.id.txt_remove);
 txt_count_item = itemView.findViewById(R.id.txt_count_item);
 img_inc = itemView.findViewById(R.id.img_inc);
 img_dec = itemView.findViewById(R.id.img_dec);
 txt_final_price_cart = itemView.findViewById(R.id.txt_final_price_cart);
 }
 }


}

اکتیویتی

package navosh.shaidi.radstore.activity;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import navosh.shaidi.radstore.MyClass.MyDatabaseHelper;
import navosh.shaidi.radstore.R;
import navosh.shaidi.radstore.adapter.AdapterCart;
import navosh.shaidi.radstore.adapter.AdapterProductPorforosh;
import navosh.shaidi.radstore.api.ApiClient;
import navosh.shaidi.radstore.api.ApiService;
import navosh.shaidi.radstore.model.CartModel;
import navosh.shaidi.radstore.model.K;
import navosh.shaidi.radstore.model.ProductModel;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class Cart extends AppCompatActivity {

    ApiService apiService;
    RecyclerView recyclerView;
    AdapterCart adapterCart;
    SharedPreferences sharedPreferences;
    String user_phone;
    TextView txt_nothing;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cart);

        sharedPreferences = getSharedPreferences(K.SHARE,MODE_PRIVATE);
        user_phone = sharedPreferences.getString(K.USERNAME,"ورود/عضویت");
        recyclerView = findViewById(R.id.recy_cart);
        txt_nothing = findViewById(R.id.txt_nothing);

        getCartList();

    }

    private void getCartList() {
        apiService = ApiClient.getRetrofit().create(ApiService.class);
        Call<List<CartModel>> call = apiService.getCartList(user_phone);
        call.enqueue(new Callback<List<CartModel>>() {
            @Override
            public void onResponse(Call<List<CartModel>> call, Response<List<CartModel>> response) {
                RecyclerView.LayoutManager manager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
                adapterCart = new AdapterCart(getApplicationContext(),response.body());
                recyclerView.setLayoutManager(manager);
                recyclerView.setAdapter(adapterCart);

                adapterCart.setId_cart(new AdapterCart.MyCallBackCart() {
                    @Override
                    public void onItemClicked(String id) {
                        Call<CartModel> call1 = apiService.deletFromCart(id);
                        call1.enqueue(new Callback<CartModel>() {
                            @Override
                            public void onResponse(Call<CartModel> call, Response<CartModel> response) {
                                Toast.makeText(Cart.this, response.body().toString(), Toast.LENGTH_SHORT).show();
                            }

                            @Override
                            public void onFailure(Call<CartModel> call, Throwable t) {
                            }
                        });
                    }
                });
                if (response.body().isEmpty()){
                    txt_nothing.setVisibility(View.VISIBLE);
                }else {
                    txt_nothing.setVisibility(View.GONE);
                }
            }

            @Override
            public void onFailure(Call<List<CartModel>> call, Throwable t) {

            }
        });
    }
}