caling fragment method inside adapter but my value going null what should add? - android-studio

Question

This is my CartAdapter I called GetCart function in this adapter my function is calling successfully but my orgmst id and userid going null to database.
quantity.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
new GetUpdateQuantity().execute();
TwoFragment fragment = new TwoFragment();
fragment.Getcart();
if (quantity.length() == 0) {
} else {
quan = Double.parseDouble(quantity.getText().toString());
rate = Double.parseDouble(rate1.getText().toString());
total1 = Double.parseDouble(String.valueOf(rate * quan));
// convert double to string to get value
String show = Double.toString(total1);
//show in Textview
total.setText(show);
Log.d("<<<hcvyd", "" + show);
}
}
#Override
public void afterTextChanged(Editable s) {
}
});
----------
In myfragment i create method to send data to webservice this method i call in GetCart function then this function call inside adapter
MyFragment
'''GetCart Function'''
public void Getcart(){
String gh = orgmstid;
String hj = userid;
new GetCartItems().execute();
}
private class GetCartItems extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
#Override
public Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
String jsonStr = sh.makeServiceCall("VIEW_CART", "F", "" + 'N' + "~" + orgmstid + "~" + userid);

Answer 1

Code for background CAll
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import android.os.AsyncTask;
import android.util.Log;
public class DownloadFileFromURL extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... f_url) {
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
InputStream input = new BufferedInputStream(url.openStream(), 8192);
byte data[] = new byte[1024];
String file_string = "";
while ((count = input.read(data)) != -1) {
for (int i = 0; i < count; i++) {
file_string += (char) data[i];
}
}
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
protected void onProgressUpdate(String... progress) {
// pDialog.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
// dismissDialog(progress_bar_type);
}
}
Code for calling
new DownloadFileFromURL().execute("URL");