Did you get this error? I'm facing this error on your example and on my project, after implement the Google auth. I already activated multi-dex, but the error continues.

java.lang.IllegalArgumentException: already added : Lcom/google/android/gms/common/api/zzf; GoogleNativeLogin.Droid

UNEXPECTED TOP-LEVEL EXCEPTION:
2> java.lang.RuntimeException: Translation has been interrupted
2> at com.android.dx.command.dexer.Main.processAllFiles(Main.java:615)
2> at com.android.dx.command.dexer.Main.runMonoDex(Main.java:313)
2> at com.android.dx.command.dexer.Main.runDx(Main.java:291)
2> at com.android.dx.command.dexer.Main.main(Main.java:247)
2> at com.android.dx.command.Main.main(Main.java:94)
2> Caused by: java.lang.InterruptedException: Too many errors
2> at com.android.dx.command.dexer.Main.processAllFiles(Main.java:607)

I downloaded this example and try it. My problem is that it does not ask to continue with this account it automatically get the logged in account on the FB app and if I logged out from the FB app it asks to choose a user.(Is this the normal behavior?)

https://blog.xamarin.com/net-standard-library-support-for-xamarin/

After authentication what should i do so that i go to main page mainpage directly without going to login page?

I made the app for android.it throws an error saying GoogleSignInForms.dll was not found.
Xamarin Forms. 3.1

https://blog.xamarin.com/net-standard-library-support-for-xamarin/

Hi,
It was worked successful. but after first choice the account it selecting same account after logout. It does not entitle to me for select account

I have signed the SHA1 with the fingerprint not sure what is missing. i get the same if run your code without any modification.

Severity Code Description Project File Line Suppression State
Error The "Javac" task failed unexpectedly.
System.IO.PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.
at System.IO.LongPathHelper.Normalize(String path, UInt32 maxPathLength, Boolean checkInvalidCharacters, Boolean expandShortPaths)
at System.IO.Path.NewNormalizePath(String path, Int32 maxPathLength, Boolean expandShortPaths)
at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
at System.IO.Path.GetFullPathInternal(String path)
at System.IO.FileInfo.Init(String fileName, Boolean checkHost)
at System.IO.FileInfo..ctor(String fileName)
at Xamarin.Android.Tasks.ZipArchiveEx.AddFiles(String folder, String folderInArchive)
at Xamarin.Android.Tasks.ZipArchiveEx.AddDirectory(String folder, String folderInArchive)
at Xamarin.Android.Tasks.Javac.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext() GoogleNativeLogin.Droid

After Loading Project and restore nuget packages it still showing below error

Severity Code Description Project File Line Suppression State
Error Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.NoActionBar'. GoogleNativeLogin.Droid C:\Users\Admin\Documents\Samples\login\google\GoogleNativeLogin\GoogleNativeLogin.Droid\Resources\values\styles.xml 2

I'm Gettin developer error in OnActivity Result

This is i'm getting

data: {Intent { (has extras) }}
Extras: {Bundle[{googleSignInStatus=Status{statusCode=DEVELOPER_ERROR, resolution=null}}]}

In my app login with IOS is working fine .But for android it is giving an unknown error has occured.
can you please help me .
and i want to know in android where it is exactly using the client id.

var googleServiceDictionary = NSDictionary.FromFile("GoogleService-Info.plist"); is null

please help me? Why i don't get infor file?

I am getting null NullReferenceException.

The exception is thrown when the method PresentViewController is called on iOS Google manager.
When the method is called the field _viewController is null

If you can take a look it would be great.

Thank you in advance, and a great tutorial.

Hi,

thanks for your nice documentation, i would like to say that a step is missing. when you debug, you need to sign your project with cert used to create SHA1 code, otherwise you get status as "cancelled" as some of them complained in the comments.

Beside that it would be nice if you could extend your article how to get token which can be used for services like firebase etc.

thank you for your help.

Emil

I got "An error occured!" message after selecting my google account. I tried to use my google settings, but the json file downloaded from google developer console is not google-service.json. Please advice how to make Xamarin.GooglePlayServices.Auth work in Xamarin.Form project.
Thank you very much.
Henry

I am getting this error when I click on the login button:

Unhandled Exception:

System.NullReferenceException: Object reference not set to an instance of an object.

Thank you for answers !