如何使用CookieManager为特定域删除Cookie？

Question

我知道CookieManager的存在，但我如何才能删除域的cookie？

有人可以帮我一些代码片段吗？

Answer 1

致电android.webkit.CookieManager的getCookie方法为您感兴趣的URL或域生成RFC 2109 Cookie标头。解析cookie标题以获取cookie名称列表。对于每个cookie名称，为该名称生成一个RFC 2109 Set-Cookie标题，该标题的过期日期已过期，并将其传递到CookieManager的setCookie方法中。尽管API文档指定setCookie忽略已过期的值，但在这种情况下，Android的当前实现实际上会刷新cookie。为防止未来的实现忽略文档中指定的过期值，请检查cookie是否真的被删除，并执行一些后备行为，如果它们没有 - CookieManager的removeAllCookie方法可能对此回退有用。

Answer 2

我在API中并没有看到这样做，但你总是可以深入到真正的源代码中（例如，我发现这个类的deleteCookies方法：WebViewDatabase其中是Android核心的一部分。

正如你可以看到那里...... Cookie只是SQLite数据库中的行...所以如果你能使这个类工作，至少你知道如何通过你自己做到这一点。

Answer 3

public void clearCookies(String domain) { 
    CookieSyncManager.createInstance(this); 
    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"); 
    } 
    CookieSyncManager.getInstance().sync(); 
} 

Answer 4

这是来自开源项目的代码示例。也许可以帮助某人。

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(); 
    } 
}