Jeżeli strona ma stały 'szablon' to możesz pochować elementy:
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
webView.loadUrl("javascript:(function() { " +
"document.getElementById('header-wrap').style.display='none';})()");
webView.loadUrl("javascript:(function() { " +
"document.getElementsByClassName('gallery')[0].style.display='none';})()");
super.onPageFinished(view, url);
}
});
webView.loadUrl("http://xxxxxx/");