Android - Adding Advertiser ID param to all url in webview Raw

customWebview.java

webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url.contains("api_user_id")) {
                    return false;
                }

                url += (url.contains("?")) ? "&" : "?";
                url += "api_user_id=";
                url += "<AD_ID_FROM_SOMEWHERE_ELSE>";

                view.loadUrl(url);
                return true;
            }
        });