如何通過使用共享後在Facebook上Xamarin窗體

Question

我目前正在對Xamarin和我很困惑與Facebook的分享中xamarin形式的選擇尤其是在Xamarin的Android的IOS代碼

公共無效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(); 
     } 

    } 

停靠我是Xamarin的Android Facebook發佈共享的唯一的事情。 任何人都可以根據Xamarin Android修改此代碼或分享他/她自己的代碼。

Answer 1

我已經實施了twitter和fb的共享。

的iOS版本

可以共享使用本地社會服務從iOS和如果沒有可用的使用 OAuth2Authenticator獲得訪問令牌，然後發佈使用FB graph

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版本

您可以使用本地facebook ShareDialog，如果不可用OAuth2Authenticator獲得訪問令牌，然後使用FB graph 和使用OAuth1Authenticator張貼擺在twitter上

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)); 
      } 


     }