Facebook login for Xamarin.Android?

[exosk...@gmail.com]

hello guys, has anyone implement something like this?

[Davi Macêdo]

Hi.

Take a look if this link can help you:

http://docs.back4app.com/docs/android/facebook-login/

Best!

[exosk...@gmail.com]

I have seen it but i wasnt able to make it

[exosk...@gmail.com]

This is my implementation but is ve buggy, sometimes crash, and while the login is saving the data the operations are done on the background and the user doesnt show a wait message or something, its like the app close and opens again after the login is complete, how i can make it better?

I also save the image and the Real name of the user in the parse database

void LoginToFacebook()

 {

 var auth = new OAuth2Authenticator(

 clientId: "809804315805408",

 scope: "",

 authorizeUrl: new Uri("https://m.facebook.com/dialog/oauth/"),

 redirectUrl: new Uri("http://www.facebook.com/connect/login_success.html")

 );

 auth.AllowCancel = true;

 // If authorization succeeds or is canceled, .Completed will be fired.

 auth.Completed += LoginComplete;

 var intent = auth.GetUI(this);

 StartActivity(intent);

 }

 

 public async void LoginComplete(object sender, AuthenticatorCompletedEventArgs e)

{

string id = "";

string name = "";

JsonValue obj;

if (!e.IsAuthenticated)

{

var builder = new AlertDialog.Builder(this);

builder.SetMessage("Not Authenticated");

builder.SetPositiveButton("Ok", (o, c) => { });

builder.Create().Show();

return;

}

else {

// Now that we're logged in, make a OAuth2 request to get the user's info.

var request = new OAuth2Request("GET", new Uri("https://graph.facebook.com/me"), null, e.Account);

await request.GetResponseAsync().ContinueWith(t =>

{

var builder = new AlertDialog.Builder(this);

if (t.IsFaulted)

{

builder.SetTitle("Error");

builder.SetMessage(t.Exception.Flatten().InnerException.ToString());

builder.Show();

}

else if (t.IsCanceled)

{

builder.SetTitle("Task Canceled");

builder.Show();

}

else {

obj = JsonValue.Parse(t.Result.GetResponseText());

id = obj["id"];

name = obj["name"];

}

builder.SetPositiveButton("Ok", (o, c) => { });

builder.Create();

}, UIScheduler);

var accessToken = e.Account.Properties["access_token"].ToString();

var expiresIn = Convert.ToDouble(e.Account.Properties["expires_in"]);

var expiryDate = DateTime.Now + TimeSpan.FromSeconds(expiresIn);

var user = await ParseFacebookUtils.LogInAsync(id, accessToken, expiryDate);

try

{

user.Add("Name", name);

}

catch (Exception ex)

{

Console.WriteLine("LoginFragment.cs | LoginComplete() :: user.Add (\"Name\",name); :: " + ex.Message);

}

var webClient = new WebClient();

//var httpClient = new HttpClient(new NativeMessageHandler());

var url = new Uri("http://graph.facebook.com/" + id + "/picture?type=small");

application.currentUserImageUrl = url.ToString();

application.currentUserName = name;

byte[] bytes = null;

//bytes = await httpClient.GetByteArrayAsync(url);

bytes = await webClient.DownloadDataTaskAsync(url);

ParseFile saveImageFile = new ParseFile("profileImage.jpg", bytes);

try

{

user.Add("profile_pic", saveImageFile);

}

catch (Exception ex)

{

Console.WriteLine("LoginFragment.cs | LoginComplete() :: user.Add (\"profile_pic\",saveImageFile); :: " + ex.Message);

}

application.currentUser = user;

await user.SaveAsync();

ChangeScreen();

}

}

[exosk...@gmail.com]

any ideas?

[Davi Macêdo]

Hi.

Could you please choose a time slot in the link below?

https://calendly.com/back4app/15min/11-04-2016

It will be easier debug it together with you.

best!

[exosk...@gmail.com]

if anyone wants something like this i believe this: http://stackoverflow.com/questions/40529682/making-a-prettier-facebook-login-screen-for-parse-com-server-with-xamarin-androi/40631548#40631548 will help him

[Davi Macêdo]

Thank you for sharing the solution. Best!