public static String getDefaultUserAgentString(Context context) {
        if (Build.VERSION.SDK_INT >= 17) {
            return NewApiWrapper.getDefaultUserAgent(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) {
            try{
                return new WebView(context).getSettings().getUserAgentString();
            }catch (Exception e1){
                //no WebView is installed
                return "Mozilla/5.0 (Linux; Android 8.0; SM-G930V Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.125 Mobile Safari/537.36" ;
            }
        }
    }