Android: converting String to int to subtract two string

Android: converting String to int to subtract two string

Suppose we are getting value from Database in String format and our task is to subtract 

try {

    jObj = new JSONObject(response);




    int userId = jObj.getInt("success");




    int coupne_amount = jObj.getInt("coupne_amount");//any integer value




    if (userId == 1) {

//Suppose this is String 

        String fixedrate = Totalprice.getText().toString().trim();

now convert that into integer:

        int fixedpriceafterremove= Integer.parseInt(fixedrate.substring(5));




        

        String final_ = String.valueOf(fixedpriceafterremove - coupne_amount);






final results will be printed here









       Totalprice.setText(final_);







       

       // Toast.makeText(hotel_details.this, final_, Toast.LENGTH_SHORT).show();




    } else {

        int errorMsg = jObj.getInt("error_msg");







    }

} catch (JSONException e) {

}