Recyclerview independent buttons and counter

I have a problem. The 2 buttons (+ and -) have the same counter. When I for example increase coke (lets say we want 2 cokes) i press the button 2 times and everything works, but as soon as i want french fries ( 1 french fries in addition to the 2 cokes) the counter at french fries increases to 3 whereas it should be 1 because i clicked it the first time. The following picture showes the problem.

The following xml and java classfile reconstruct the image you are seeing. Maybe you can help me out, i would be very thankful.

OrderActivity.java

package com.nfc.netvision;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import java.util.ArrayList;
public class OrderActivity extends AppCompatActivity {
RecyclerView recyclerView;
ArrayList<ModelOrder> orderArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order);
recyclerView = findViewById(R.id.recyclerview_order_scroll);
orderArrayList = new ArrayList<>();
orderArrayList.add(new ModelOrder(R.drawable.coke, "Coka Cola", "Kaltes Getränml", "6"));
orderArrayList.add(new ModelOrder(R.drawable.fastfood, "Coka Cola", "Kaltes Getränml", "10"));
orderArrayList.add(new ModelOrder(R.drawable.water, "Coka Cola", "Kaltes Getränml", "20"));
orderArrayList.add(new ModelOrder(R.drawable.burger, "Coka Cola", "Kaltes Getränml", "30"));
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
RecyclerView.LayoutManager recLiLayoutManager = layoutManager;
recyclerView.setLayoutManager(recLiLayoutManager);
OrderAdapter adapter = new OrderAdapter(this, orderArrayList);
recyclerView.setAdapter(adapter);
}
}

OrderAdapter.java

package com.nfc.netvision;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class OrderAdapter extends RecyclerView.Adapter<OrderAdapter.ViewHolder> {
int value = 0; //Global
private Context mContext;
private ArrayList<ModelOrder> nList;
OrderAdapter(Context context, ArrayList<ModelOrder> list) {
mContext = context;
nList = list;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(mContext);
View view = layoutInflater.inflate(R.layout.recyclerview_order_items, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
ModelOrder orderItem = nList.get(position);
ImageView image = holder.item_image;
TextView name, place, price;
name = holder.item_name;
place = holder.item_place;
price = holder.item_price;
image.setImageResource(orderItem.getImage());
name.setText(orderItem.getName());
place.setText(orderItem.getPlace());
price.setText(orderItem.getPrice());
holder.order_item_minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
value = value - 1;
holder.order_item_count.setText("" + value);
}
});
holder.order_item_plus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
value = value + 1;
holder.order_item_count.setText("" + value);
}
});
}
@Override
public int getItemCount() {
return nList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView item_image;
TextView item_name, item_place, item_price,order_item_minus,order_item_count, order_item_plus;
public ViewHolder(@NonNull View itemView) {
super(itemView);
item_image = itemView.findViewById(R.id.order_item_image);
item_name = itemView.findViewById(R.id.order_item_name);
item_place = itemView.findViewById(R.id.order_item_place);
item_price = itemView.findViewById(R.id.order_item_price);
order_item_minus = itemView.findViewById(R.id.order_item_minus);
order_item_plus = itemView.findViewById(R.id.order_item_plus);
order_item_count = itemView.findViewById(R.id.order_item_count);
}
}
}

recyclerViewer.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp">
<LinearLayout
android:weightSum="10"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/order_item_image"
android:layout_width="0dp"
android:layout_weight="4"
android:layout_height="128dp"
android:scaleType="centerCrop"
android:src="@drawable/coke"/>
<LinearLayout
android:layout_width="0dp"
android:layout_weight="4"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/order_item_name"
android:textSize="18sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:text="Name"/>
<TextView
android:id="@+id/order_item_place"
android:text="Description"
android:textSize="14sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<TextView
android:id="@+id/order_item_price"
android:text="€ Preis"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_gravity="center"
android:gravity="center"
android:textColor="#fff"
android:background="@drawable/capsule_order"
android:layout_height="30dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom">
<TextView
android:id="@+id/order_item_minus"
android:layout_width="28dp"
android:layout_height="28dp"
android:textSize="25dp"
android:layout_gravity="center"
android:gravity="center"
android:background="@drawable/capsule_order"
android:textColor="#fff"
android:textStyle="bold"
android:text="-"/>
<TextView
android:id="@+id/order_item_count"
android:layout_width="28dp"
android:layout_height="28dp"
android:textSize="25dp"
android:layout_gravity="center"
android:gravity="center"
android:textColor="#000"
android:textStyle="bold"
android:text="00"/>
<TextView
android:id="@+id/order_item_plus"
android:layout_width="28dp"
android:layout_height="28dp"
android:textSize="25dp"
android:layout_gravity="center"
android:gravity="center"
android:background="@drawable/capsule_order"
android:textColor="#fff"
android:textStyle="bold"
android:text="+"/>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>

activity_order.xml

<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerview_order_scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</androidx.recyclerview.widget.RecyclerView>
</androidx.core.widget.NestedScrollView>

because you always access the value variable that you initialized in Adapter

solution is to
add value to your ModelOrder and initiate it in model

then access it

so .. it will be different for every row

OrderActivity.java // initialize every model with counter = 0

orderArrayList.add(new ModelOrder(R.drawable.coke, "Coka Cola", "Kaltes Getränml", "6",0));
orderArrayList.add(new ModelOrder(R.drawable.fastfood, "Coka Cola", "Kaltes Getränml", "10",0));
orderArrayList.add(new ModelOrder(R.drawable.water, "Coka Cola", "Kaltes Getränml", "20",0));
orderArrayList.add(new ModelOrder(R.drawable.burger, "Coka Cola", "Kaltes Getränml", "30",0));

OrderAdapter.java

remove this line

> int value = 0; //Global

holder.order_item_minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
orderItem.setCounter(orderItem.getCounter()-1);
holder.order_item_count.setText("" + orderItem.getCounter());
}
});
holder.order_item_plus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
orderItem.setCounter(orderItem.getCounter()+1);
holder.order_item_count.setText("" + orderItem.getCounter());
}
});

You've to add 'quantity' attribute which has INT data type in your ModelOrder
So, increment/decrement value of 'quantity' in an object according to plus/minus button click, and set 'quantity' value in your counter textview