如何从webview获取会话用户ID

Question

尝试从Android webview获取用户会话userid，但使用下面的代码我的应用程序将强制停止工作，在构建apk时没有任何错误。请我仍然在尝试完成我的第一个webview应用程序，我仍然是android的新手

public String getCookie(String siteName,String CookieName){
    String CookieValue = null;

    CookieManager cookieManager = CookieManager.getInstance();
    String cookies = cookieManager.getCookie(siteName);
    String[] temp=cookies.split(";");
    for (String ar1 : temp ){
        if(ar1.contains(CookieName)){
            String[] temp1=ar1.split("=");
            CookieValue = temp1[1];
            break;
        }
    }
    return CookieValue;
}

参考上述代码https://stackoverflow.com/a/20241926/8778864

public void onPageFinished(WebView view, String url) {
  String cookies = CookieManager.getInstance().getCookie(url);
 showAlert(FoodShopMainActivity.this, "Cookies", "cookies string:" + cookies);
}

上面的代码将输出PHPSESSID=g675654hghghf7ghgyty，但只有会话用户ID。

public void onPageFinished(WebView view, String url) {
 /*String userCookie = getCookie("http://www.example.com","online_users");
  showAlert(FoodShopMainActivity.this, "Cookies", "cookies string:" + userCookie);*/
}

以上代码将show app has stopped working一旦推出