Android编程下WebView加载一个网页如何得到网页的Cookie值

private class MyWebViewClient extends WebViewClient {

        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            webview.loadUrl(url);
            return true;
        }

        public void onPageFinished(WebView view, String url) {
            COOKIEManager COOKIEManager = COOKIEManager.getInstance();
            String COOKIEStr = COOKIEManager.getCOOKIE(url);
            Log.e("sunzn", "COOKIEs = " + COOKIEStr);
            super.onPageFinished(view, url);
        }

    }