you can’t start something on screenA and end it on screenB…
just remove the notifier and test switching screens after building the app to find out, that switching screns work quite fast, i.e. you do not need a progress dialog…
alternatively simulate different screens, see also tip 1 here
@Alapjeet your answer is inappropirate… what about providing a useful and constructive answer next time? you can consider this as a warning!