这个错误怎么解决？求教！

java.lang.IllegalStateException: Call CookieSyncManager::createInstance() or create a webview before using this class

CookieManager cookieManager=CookieManager.getInstance();
cookieManager.setCookie(url, cookieString);

在调用cookiemanager之前，先初始化一个webview，别忘了哦

用CookieManager操作Cookie前需要进行Cookie同步，只要在CookieManager.getInstance().setCookie(serverName, "")前添加如下代码，问题便可解决：

CookieSyncManager cookieSyncManager = CookieSyncManager.createInstance(this);
cookieSyncManager.startSync();