Android。WebView加载UR请求使用Cookie储存User_Id记录用户是否登陆过

1.WebView初始化的时候用倒如下代码：

if (Build.VERSION.SDK_INT >= 21) {
    CookieManager.getInstance().setAcceptThirdPartyCookies(mWebView, true);
}
syncCookie(this, url);

2.实现Cookie储存方法
/**
 * Sync Cookie
 */
private void syncCookie(Context context, String url) {
    try {
        CookieSyncManager.createInstance(context);

        cookieManager = CookieManager.getInstance();
        cookieManager.setAcceptCookie(true);
        cookieManager.removeSessionCookie();// 移除
        cookieManager.removeAllCookie();

        String oldCookie = cookieManager.getCookie(url);
        if (oldCookie != null) {
            Log.d("oldCookie", oldCookie);
        }

        StringBuilder sbCookie = new StringBuilder();
        String userId = BKSetting.getUserId(this);
        sbCookie.append(String.format("user_id=%s", userId));//我自己放的Cookie

        String cookieValue = sbCookie.toString();
        cookieManager.setCookie(url, cookieValue);
        CookieSyncManager.getInstance().sync();

    } catch (Exception e) {
        Log.e("syncCookie failed", e.toString());
    }
}