Sending data to one activity to another activity with volley - android-studio

Question

I have an activity that makes a connection with an php file. that php file needs an ean to work. so I need to send the ean code from my input field in my main activity to my second activity so I can send it to php but I could get it to work. this is what I have:
// Intent productInfo = new Intent(mainActivity.this, androidProductRequest.class);
// productInfo.putExtra("ean",ean.getText().toString());
// startActivity(productInfo);
androidProductRequest androidProductRequest = new androidProductRequest(Integer.parseInt(ean.getText().toString()));
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(androidProductRequest);
at first I thought maybe it will work when I send it with intent but then I saw that u need to do an something with requestqueue but couldn't figure out what exactly. this is what I have on the second activity:
package com.example.productfinder;
import android.util.Log;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class androidProductRequest extends mainActivity {
public void androidProductRequest (final String ean){
try {
RequestQueue requestQueue = Volley.newRequestQueue(this);
String URL = "My_url";
JSONObject jsonBody = new JSONObject();
jsonBody.put("Title", "Android Volley Demo");
final String requestBody = jsonBody.toString();
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.i("VOLLEY1", response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("VOLLEY", error.toString());
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
return params;
}
};
requestQueue.add(stringRequest);
} catch (JSONException e) {
e.printStackTrace();
}
}
}