How to remove cookies using CookieManager for a specific domain?

I know about the existince of CookieManager, but how do I remove cookies of a domain only?

Can someone help me开发者_如何学JAVA with some code fragment?

public void clearCookies(String domain) {
    CookieManager cookieManager = CookieManager.getInstance();
    String cookiestring = cookieManager.getCookie(domain);
    String[] cookies =  cookiestring.split(";");
    for (int i=0; i<cookies.length; i++) {
        String[] cookieparts = cookies[i].split("=");
        cookieManager.setCookie(domain, cookieparts[0].trim()+"=; Expires=Wed, 31 Dec 2025 23:59:59 GMT");
    }
}

Call android.webkit.CookieManager's getCookie method to generate a RFC 2109 Cookie header for the URL or domain you are interested. Parse the cookie header to get a list of cookie names. For each cookie name, generate a RFC 2109 Set-Cookie header for that name that has an expiry date in the past and pass it into CookieManager's setCookie method. Although the API docs specify that setCookie ignores values that have expired, Android's current implementation actually flushes the cookie in this case. To guard against future implementations that do ignore expired values as specified in the documentation, check that the cookies were actually removed and perform some fallback behaviour if they haven't—CookieManager's removeAllCookie method may be useful for this fallback.

Here is a code sample from an open source project. Maybe could help someone.

https://github.com/janrain/engage.android/blob/96f21b45738ef82a911e27d8a707aff3a1024d36/Jump/src/com/janrain/android/utils/WebViewUtils.java

private static void deleteWebViewCookiesForDomain(Context context, String domain, boolean secure) {
    CookieSyncManager csm = CookieSyncManager.createInstance(context);
    CookieManager cm = CookieManager.getInstance();

    /* http://code.google.com/p/android/issues/detail?id=19294 */
    if (AndroidUtils.SDK_INT >= 11) {
        // don't trim leading '.'s
    } else {
        /* Trim leading '.'s */
        if (domain.startsWith(".")) domain = domain.substring(1);
    }

    /* Cookies are stored by domain, and are not different for different schemes (i.e. http vs
     * https) (although they do have an optional 'secure' flag.) */
    domain = "http" + (secure ? "s" : "") + "://" + domain;
    String cookieGlob = cm.getCookie(domain);
    if (cookieGlob != null) {
        String[] cookies = cookieGlob.split(";");
        for (String cookieTuple : cookies) {
            String[] cookieParts = cookieTuple.split("=");

            /* setCookie has changed a lot between different versions of Android with respect to
             * how it handles cookies like these, which are set in order to clear an existing
             * cookie.  This way of invoking it seems to work on all versions. */
            cm.setCookie(domain, cookieParts[0] + "=;");

            /* These calls have worked for some subset of the the set of all versions of
             * Android:
             * cm.setCookie(domain, cookieParts[0] + "=");
             * cm.setCookie(domain, cookieParts[0]); */
        }
        csm.sync();
    }
}

I don't see anyway to do this in the API, but you can always dig into the real source code (open source is nice)... for example, I found this deleteCookies method in this class: WebViewDatabase which is part of the core of Android.

As you can see there... cookies are just rows into a SQLite Database... so if you can make this class work, at least you know how to do it by your self.