我目前正在使用Xamarin，我对xamarin表单中的facebook共享选项感到困惑，特别是在Xamarin Android中，IOS代码是
public void ShareOnFacebook（IFacebookDelegate pDele） {
string[] perm = {"publish_actions"};
if (AccessToken.CurrentAccessToken == null || !AccessToken.CurrentAccessToken.HasGranted("publish_actions"))
{
UIViewController mainController = UIApplication.SharedApplication.KeyWindow.RootViewController;
_manager.LogInWithPublishPermissions(perm, mainController, (result, error) =>
{
if (error != null || result.IsCancelled)
{
}
else {
ShareNow();
}
});
} else {
ShareNow();
}
}
唯一阻止我的是Xamarin Android facebook发布分享。 任何人都可以根据Xamarin Android修改此代码或分享他/她自己的代码。
答案 0 :(得分：1)
我已经为twitter和fb实现了分享。
iOS版
您可以使用ios的本地社交服务进行共享，如果没有可用的话 OAuth2Authenticator获取访问令牌，然后使用FB graph
发布public void ShareViaSocial(string serviceType, string urlToShare)
{
socialKind = serviceType == "Twitter" ? SLServiceKind.Twitter : SLServiceKind.Facebook;
if (SLComposeViewController.IsAvailable(socialKind))
{
_socialComposer = serviceType == "Twitter" ? SLComposeViewController.FromService(SLServiceType.Twitter) : SLComposeViewController.FromService(SLServiceType.Facebook);
_socialComposer.AddUrl(new Uri(urlToShare));
viewController.PresentViewController(_socialComposer, true, () =>
{
_socialComposer.CompletionHandler += (result) =>
{
Device.BeginInvokeOnMainThread(() =>
{
viewController.DismissViewController(true, null);
if (result == SLComposeViewControllerResult.Done)
{ OnShare(this, ShareStatus.Successful); }
else
{ OnShare(this, ShareStatus.NotSuccessful); }
});
};
});
}
//If user doest have fb app and no credential for social services we use fb graph
else if (socialKind == SLServiceKind.Facebook)
{
var auth = new OAuth2Authenticator(
clientId: SharedConstants.FacebookLiveClientId,
scope: SharedConstants.FacebookScopes,
authorizeUrl: new Uri(SharedConstants.FacebookAuthorizeUrl),
redirectUrl: new Uri(SharedConstants.FacebookRedirectUrl));
viewController.PresentViewController((UIViewController)auth.GetUI(), true, null);
auth.AllowCancel = true;
auth.Completed += (s, e) =>
{
//hide the webpage after completed login
viewController.DismissViewController(true, null);
// We presented the UI, so it's up to us to dimiss it on iOS.
if (e.IsAuthenticated)
{
Account fbAccount = e.Account;
Dictionary<string, string> dictionaryParameters = new Dictionary<string, string>() { { "link", urlToShare } };
var requestUrl = new Uri("https://graph.facebook.com/me/feed");
var request = new OAuth2Request(SharedConstants.requestMethodPOST, requestUrl, dictionaryParameters, fbAccount);
request.GetResponseAsync().ContinueWith(this.requestResult);
}
else { OnShare(this, ShareStatus.NotSuccessful); }
};
auth.Error += Auth_Error;
}
//If user doest have twitter app and no credential for social services we use xanarub auth for token and call twitter api for sending tweets
else
{
var auth = new OAuth1Authenticator(
SharedConstants.TwitterConsumerKey,
SharedConstants.TwitterConsumerSecret,
new Uri(SharedConstants.TwitterRequestUrl),
new Uri(SharedConstants.TwitterAuth),
new Uri(SharedConstants.TwitterAccessToken),
new Uri(SharedConstants.TwitterCallBackUrl));
auth.AllowCancel = true;
// auth.ShowUIErrors = false;
// If authorization succeeds or is canceled, .Completed will be fired.
auth.Completed += (s, e) =>
{
// We presented the UI, so it's up to us to dismiss it.
viewController.DismissViewController(true, null);
if (e.IsAuthenticated)
{
Account twitterAccount = e.Account;
Dictionary<string, string> dictionaryParameters = new Dictionary<string, string>() { { "status", urlToShare } };
var request = new OAuth1Request(SharedConstants.requestMethodPOST, new Uri("https://api.twitter.com/1.1/statuses/update.json"), dictionaryParameters, twitterAccount);
//for testing var request = new OAuth1Request("GET",new Uri("https://api.twitter.com/1.1/account/verify_credentials.json "),null, twitterAccount);
request.GetResponseAsync().ContinueWith(this.requestResult);
}
else { OnShare(this, ShareStatus.NotSuccessful); }
};
auth.Error += Auth_Error;
//auth.IsUsingNativeUI = true;
viewController.PresentViewController((UIViewController)auth.GetUI(), true, null);
}
}
Android版
您可以使用原生facebook ShareDialog，如果不可用，请使用OAuth2Authenticator获取访问令牌，然后使用FB graph发布 并使用OAuth1Authenticator在twitter上摆姿势
public void ShareViaSocial(string serviceType, string urlToShare)
{
ShareDialog di = new ShareDialog(MainActivity.Instance);
var facebookShareContent = new ShareLinkContent.Builder();
facebookShareContent.SetContentUrl(Android.Net.Uri.Parse(urlToShare));
if (serviceType == "Facebook")
{
if (di.CanShow(facebookShareContent.Build(), ShareDialog.Mode.Automatic))
{
di.Show(facebookShareContent.Build());
}
else
{
var auth = new OAuth2Authenticator(
clientId: 'ClientId',
scope: "public_profile,publish_actions",
authorizeUrl: new Uri("https://m.facebook.com/dialog/oauth/"),
redirectUrl: new Uri( "http://www.facebook.com/connect/login_success.html"));
MainActivity.Instance.StartActivity(auth.GetUI(MainActivity.Instance.ApplicationContext));
auth.AllowCancel = true;
auth.Completed += (s, e) =>
{
if (e.IsAuthenticated)
{
Account fbAccount = e.Account;
Dictionary<string, string> dictionaryParameters = new Dictionary<string, string>() { { "link", urlToShare } };
var requestUrl = new Uri("https://graph.facebook.com/me/feed");
var request = new OAuth2Request(SharedConstants.requestMethodPOST, requestUrl, dictionaryParameters, fbAccount);
request.GetResponseAsync().ContinueWith(this.requestResult);
}
else { OnShare(this, ShareStatus.NotSuccessful); }
};
auth.Error += Auth_Error;
}
}
else
{
var auth = new OAuth1Authenticator(
'TwitterConsumerKey',
'TwitterConsumerSecret',
new Uri("https://api.twitter.com/oauth/request_token"),
new Uri("https://api.twitter.com/oauth/authorize"),
new Uri("https://api.twitter.com/oauth/access_token"),
new Uri('TwitterCallBackUrl'));
auth.AllowCancel = true;
// auth.ShowUIErrors = false;
// If authorization succeeds or is canceled, .Completed will be fired.
auth.Completed += (s, e) =>
{
// We presented the UI, so it's up to us to dismiss it.
if (e.IsAuthenticated)
{
Account twitterAccount = e.Account;
Dictionary<string, string> dictionaryParameters = new Dictionary<string, string>() { { "status", urlToShare } };
var request = new OAuth1Request(SharedConstants.requestMethodPOST, new Uri("https://api.twitter.com/1.1/statuses/update.json"), dictionaryParameters, twitterAccount);
//for testing var request = new OAuth1Request("GET",new Uri("https://api.twitter.com/1.1/account/verify_credentials.json "),null, twitterAccount);
request.GetResponseAsync().ContinueWith(this.requestResult);
}
else { OnShare(this, ShareStatus.NotSuccessful); }
};
auth.Error += Auth_Error;
//auth.IsUsingNativeUI = true;
MainActivity.Instance.StartActivity(auth.GetUI(MainActivity.Instance.ApplicationContext));
}
}