c# – Click on facebook LoginButton on android using Xamarin with FaceBookSDK nothing happens

Question:

I'm using Xamarin to try to login with facebook, I've generated the Hash and the appID. (Apparently this is correct, as previously the app returned a msg saying that the HASH was invalid). Here is my activity code:

    protected override void OnResume()
    {
        base.OnResume();
        // Logs 'install' and 'app activate' App Events.
        AppEventsLogger.ActivateApp(this);
    }
    /// <summary>
    /// Register events logs of the facebook
    /// </summary>
    protected override void OnPause()
    {
        base.OnPause();
        AppEventsLogger.DeactivateApp(this);
    }
    public override View OnCreateView(View parent, string name, Context context, IAttributeSet attrs)
    {
        return base.OnCreateView(parent, name, context, attrs);
    }
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        FacebookSdk.SdkInitialize(this.ApplicationContext);
        SetContentView(Resource.Layout.splash);



        var callbackmanage = CallbackManagerFactory.Create();
        LoginButton loginbutton = (LoginButton) base.FindViewById(Resource.Id.login_button);
        var fcb = new facebookCallBack();

        loginbutton.RegisterCallback(callbackmanage,fcb);


    }

    private class facebookCallBack : IFacebookCallback
    {
        public IntPtr Handle
        {
            get
            {
                return new IntPtr();
            }
        }

        public void Dispose()
        {
        }

        public void OnCancel()
        {

        }

        public void OnError(FacebookException p0)
        {

        }

        public void OnSuccess(Java.Lang.Object p0)
        {

        }
    }

It turns out that now when I click the login button, nothing happens. It does not give any error messages, nor does it enter callback methods ( OnError , OnPause etc), it gives absolutely nothing.

That way I get lost. Can anyone help?

Answer:

You need at least one line of code within the method for the breakpoint to enter. Put a log line and put the breakpoint on the log line.

private class facebookCallBack : IFacebookCallback
{
    public IntPtr Handle
    {
        get
        {
            return new IntPtr();
        }
    }

    public void Dispose()
    {
        Console.WriteLine("Teste Dispose");
    }

    public void OnCancel()
    {
        Console.WriteLine("Teste OnCancel");
    }

    public void OnError(FacebookException p0)
    {
        Console.WriteLine("Teste OnError");
    }

    public void OnSuccess(Java.Lang.Object p0)
    {
        Console.WriteLine("Teste OnSuccess");
    }
}

Try…

Replace AppEventsLogger.ActivateApp(this); by AppEventsLogger.ActivateApp(getApplication()); and put that line in void OnCreate .

Move the AppEventsLogger.DeactivateApp(this); for void OnDestroy .

If a feedback works.