如何使用CookieManager爲特定域刪除Cookie？

Question

我知道CookieManager的存在，但我如何才能刪除域的cookie？

有人可以幫我一些代碼片段嗎？

Answer 1

致電android.webkit.CookieManager的getCookie方法爲您感興趣的URL或域生成RFC 2109 Cookie標頭。解析cookie標題以獲取cookie名稱列表。對於每個cookie名稱，爲該名稱生成一個RFC 2109 Set-Cookie標題，該標題的過期日期已過期，並將其傳遞到CookieManager的setCookie方法中。儘管API文檔指定setCookie忽略已過期的值，但在這種情況下，Android的當前實現實際上會刷新cookie。爲防止未來的實現忽略文檔中指定的過期值，請檢查cookie是否真的被刪除，並執行一些後備行爲，如果它們沒有 - CookieManager的removeAllCookie方法可能對此回退有用。

Answer 2

我在API中並沒有看到這樣做，但你總是可以深入到真正的源代碼中（例如，我發現這個類的deleteCookies方法：WebViewDatabase其中是Android核心的一部分。

正如你可以看到那裏...... Cookie只是SQLite數據庫中的行...所以如果你能使這個類工作，至少你知道如何通過你自己做到這一點。

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

這是來自開源項目的代碼示例。也許可以幫助某人。

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(); 
    } 
}