android - 如何使用 "CookieManager::removeAllCookies(ValueCallback callback)"

Question

我是 java 的新手，正在尝试使用 CookieManager::removeAllCookies(ValueCallback callback) 方法删除 WebView cookie。无法确定必须将哪些值传递给 removeAllCookie 方法。

文档 https://developer.android.com/reference/android/webkit/ValueCallback.html和 https://developer.android.com/reference/android/webkit/CookieManager.html#getInstance%28%29没有说明如何使用它。

我的理解是 ValueCallback 类似于 c++ 模板。但无法理解为什么需要传递一个对象来删除 cookie。

Answer 1

来自文档:

If a ValueCallback is provided, onReceiveValue() will be called on the current thread's Looper once the operation is complete. The value provided to the callback indicates whether any cookies were removed. You can pass null as the callback if you don't need to know when the operation completes or whether any cookies were removed

所以你可以这样做

CookieManager.getInstance().removeAllCookies(new ValueCallback<Boolean>() {
           @Override
           public void onReceiveValue(Boolean value) {
               Log.d(TAG, "onReceiveValue " + value);
           }
       });

或

CookieManager.getInstance().removeAllCookies(null);

此方法在 API 级别 21 中引入。如果您支持旧版本，则可能必须提供类似的内容。

if(API Level >= 21){
     CookieManager.getInstance().removeAllCookies(null);
}else{
  CookieManager.getInstance().removeAllCookie();
}