protected override void OnCreate (Android.OS.Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);
SetContentView (Resource.Layout.activity_login);
var loginAction = Intent.GetIntExtra (EXTRA_ACTION, Action.LOGIN);
var fragment = ResultTargetFragment;
if (fragment == null) {
fragment = LoginFragment.NewInstance (loginAction);
SupportFragmentManager.BeginTransaction ()
.Add (Resource.Id.login_fragment, fragment)
.Commit ();
}
}