void ListViewItemClick(object sender, AdapterView.ItemClickEventArgs e)
 {
   var contact = viewModel.Contacts[e.Position];
   var vm = new DetailsViewModel(contact);
   ContactDetailsActivity.ViewModel = vm;
   var intent = new Intent(Activity, typeof(ContactDetailsActivity));
   StartActivity(intent);
 }
        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);
              if (ViewModel == null)
              {
            ViewModel = new DetailsViewModel();
            NavigationItem.RightBarButtonItem = save;
              }
              else
              {
            this.Title = ViewModel.FirstName;
            TextEmail.Text = ViewModel.Email;
            TextFirst.Text = ViewModel.FirstName;
            TextLast.Text = ViewModel.LastName;
            TextPhone.Text = ViewModel.Phone;

            ImagePhoto.SetImage(
            url: new NSUrl(Gravatar.GetURL(ViewModel.Contact.EmailAddresses[0].Address, 172)),
            placeholder: UIImage.FromBundle("missing.png")
            );

            NavigationItem.RightBarButtonItem = null;
              }
        }
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

              email = FindViewById<EditText>(Resource.Id.email);
              phone = FindViewById<EditText>(Resource.Id.phone);
              firstName = FindViewById<EditText>(Resource.Id.first_name);
              lastName = FindViewById<EditText>(Resource.Id.last_name);
              photo = FindViewById<ImageView>(Resource.Id.photo2);

              email.TextChanged += (sender, args) =>
            {
              Koush.UrlImageViewHelper.SetUrlDrawable(photo, Gravatar.GetURL(email.Text, 88), Resource.Drawable.missing);
            };

              if (ViewModel == null)
              {
            ViewModel = new DetailsViewModel();
              }
              else
              {
            SupportActionBar.Title = ViewModel.FirstName + " " + ViewModel.LastName;
            email.Text = ViewModel.Email;
            firstName.Text = ViewModel.FirstName;
            lastName.Text = ViewModel.LastName;
            phone.Text = ViewModel.Phone;

              }

              var bottomToolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar_bottom);

              bottomToolbar.InflateMenu(Resource.Menu.detail_bottom);
              bottomToolbar.MenuItemClick += (sender, args) =>
            {

              switch (args.Item.ItemId)
              {
            case Resource.Id.calendar:
              App.NewEventViewModel.Email = ViewModel.Email;
              App.NewEventViewModel.FirstName = ViewModel.FirstName;
              App.NewEventViewModel.LastName = ViewModel.LastName;
              StartActivity(typeof(NewEventActivity));
              //ViewModel.AddEvent(new[] { ViewModel.Email }, new[] { ViewModel.FirstName });
              break;
            case Resource.Id.phone:
              var uri = Android.Net.Uri.Parse("tel:" + ViewModel.Phone);
              var intent = new Intent(Intent.ActionView, uri);
              StartActivity(intent);
              break;
            case Resource.Id.email:
              App.SendEmailViewModel.Email = ViewModel.Email;
              App.SendEmailViewModel.FirstName = ViewModel.FirstName;
              App.SendEmailViewModel.LastName = ViewModel.LastName;

              StartActivity(typeof(SendEmailActivity));
              break;
              }
            };
        }