void StartCategoryActivityWithTransition(Activity activity, View toolbar, Category category)
{
var pairs = TransitionHelper.CreateSafeTransitionParticipants(activity, false, new Pair(toolbar, activity.GetString(Resource.String.transition_toolbar)));
var sceneTransitionAnimation = ActivityOptions.MakeSceneTransitionAnimation(activity, pairs);
// Start the activity with the participants, animating from one to the other.
var transitionBundle = sceneTransitionAnimation.ToBundle();
activity.StartActivity(IntentHelper.GetStartIntent(activity, category), transitionBundle);
}
void PerformSignInWithTransition(View v)
{
var activity = Activity;
var pairs = TransitionHelper.CreateSafeTransitionParticipants(activity, true,
new Pair(v, activity.GetString(Resource.String.transition_avatar)));
var activityOptions = ActivityOptions.MakeSceneTransitionAnimation(activity, pairs);
CategorySelectionActivity.Start(activity, player, activityOptions);
}