android get default user agent

    public static String getUserAgentString(Context context) {
        try {
          Constructor<WebSettings> constructor = WebSettings.class.getDeclaredConstructor(Context.class, WebView.class);
          constructor.setAccessible(true);
          try {
            WebSettings settings = constructor.newInstance(context, null);
            return settings.getUserAgentString();
          } finally {
            constructor.setAccessible(false);
          }
        } catch (Exception e) {
          return new WebView(context).getSettings().getUserAgentString();
        }
      }