Can't pass cookies to webview in native android app

Question

this is how i'm trying to do it so far , I'm new to Java language I followed a tutorial but I can't seem to get this to work

try {
  JSONObject jsonString  = new JSONObject().put("support_full_screen", "1");
  CookieManager.getInstance().setCookie("url", jsonString.toString());
  CookieManager.getInstance().setAcceptThirdPartyCookies(webvView, true);
  webvView.loadUrl("url");
} catch (JSONException e) {
    e.printStackTrace();
}