Fill webpage input from android (webview)

gistfile1.java

  final WebView webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebChromeClient(new WebChromeClient());
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {

                String jsContent = "function() { document.getElementById('email').value = '[email protected]';}";

                view.loadUrl("javascript:(" + jsContent + ")()");


            }
        });
        webView.loadUrl("https://www.paypal.com/signin?country.x=PL&locale.x=pl_PL");