Pass cookies from native login to webview

I am following this for sharing cookies from native code to WebView. I have a native login screen. On successful login I am saving the cookies in CookieSyncManager. And when the webview loads, I am passing those cookies to it so that the login screen does not appears.
Following is what I have implemented :

public class MyApp extends Application {
    public void onCreate() {
        super.onCreate();

        //Setup Cookie Manager and Persistence to disk
        CookieSyncManager.createInstance(this);
        CookieManager.getInstance().setAcceptCookie(true);
    }
}  

HttpRequest for login :

private void executeRequest(HttpUriRequest request, String url) {
        DefaultHttpClient client = getDefaultClient(); // new DefaultHttpClient();

        syncCookiesFromAppCookieManager(loginUrl, client);

        HttpResponse httpResponse = null;

        try {
            httpResponse = client.execute(request);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        responseCode = httpResponse.getStatusLine().getStatusCode();
        message = httpResponse.getStatusLine().getReasonPhrase();

        HttpEntity entity = httpResponse.getEntity();

        if (entity != null) {

            InputStream instream = null;
            try {
            instream = entity.getContent();
              } catch (IOException e1) {
                  e1.printStackTrace();
                }
            response = convertStreamToString(instream);
            response = StringUtils.remove(response, "\n");
            syncCookiesFromAppCookieManager(loginUrl, client);
           // client.setCookieStore((org.apache.http.client.CookieStore) new PersistentCookieStore(context));



}
    }  

And in WebActivity :

CookieSyncManager.getInstance().sync();  
webview.loadUrl(url);  

But I am again getting the login screen on webView. i.e. cookies are not getting stored.

K7Ko's answer finally worked for me. But only after I commented the line

cookieManager.removeSessionCookie();