Facebook登录在XAMARIN webview中失败

Question

我正在制作工作网站的webview，但在webview中，facebook登录不起作用。我输入电子邮件，通过，当我点击登录时，它会重新登录登录页面。我需要有人知道C＃和Xamarin.Android。谢谢！

    WebView web_view;

    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);
        web_view = FindViewById<WebView>(Resource.Id.webview);
        web_view.Settings.JavaScriptEnabled = true;

        var cookieManager = CookieManager.Instance;
        cookieManager.SetAcceptCookie(true);

        web_view.SetWebViewClient(new HelloWebViewClient());
        web_view.LoadUrl("[MY LINK]");

    }


    public override bool OnKeyDown(Keycode keyCode, Android.Views.KeyEvent e)
    {
        if (keyCode == Keycode.Back && web_view.CanGoBack())
        {
            web_view.GoBack();
            return true;
        }

        return base.OnKeyDown(keyCode, e);
    }


    public class HelloWebViewClient : WebViewClient
    {

        public override bool ShouldOverrideUrlLoading(WebView view, string url)
        {
            Uri uri = new Uri(url);

            var cookieManager = CookieManager.Instance;
            var cookieContainer = new CookieContainer();
            cookieContainer.GetCookies(uri);
            cookieManager.SetAcceptCookie(true);
            cookieManager.RemoveAllCookie();
            view.Settings.JavaScriptEnabled = true;
            Console.WriteLine("{0}", url);
            return false;
        }
    }
}