How to change the Value in the Shared Preference when i change the quantity of number in Edit text in android

I am trying to change the value in shared Preference when I change the value Quantity of number in Edit Text, but it cannot be replace the value in shared preference instead of stored separately in shared preference.

Code:

  JSONArray test = new JSONArray();
  JSONArray test1 = new JSONArray();
  JSONArray test2 = new JSONArray();
  JSONArray items = null;
  JSONArray itemsQty = null;
  test1.put("0");
  test2.put("0");
  test.put(test1);
  test.put(test2);
  JSONArray listitems = null;
  String Sharedqty = String.valueOf(cartlistadp.get(getAdapterPosition()).getQty());
  String channel = (shared.getString(Constants.cartid, String.valueOf(test)));
  if (TextUtils.isEmpty(channel)) {
      try {
          listitems = new JSONArray(channel);
          itemsQty = listitems.getJSONArray(1);
      } catch (JSONException e) {
          e.printStackTrace();
      }
      for (int x = 0; x < itemsQty.length(); x++) {
          if (itemsQty.equals(qtyString)) {
              try {
                  listitems.getJSONArray(1).put(String.valueOf(qtyString));
              } catch (JSONException e) {
                  e.printStackTrace();
              }
          }
          QutId.putString(Constants.cartid,
              (String.valueOf(listitems)));
          QutId.apply();
      }
  }

Note: I used this code in EditText TextWatcher

I can't replace the value,anyone can solve this problem

Thanks in advance.