So far, all our examples have taken place on a single screen. In most real-world projects, you might be managing several screens, each with their own paths that can be pushed and popped onto the screen.
Flutter, and more specifically MaterialApp, uses a class called Navigator to manage your app's screens. Screens are abstracted into a concept called Routes, which contain both the widget we want to show and how we want to animate them on the screen. Navigator also keeps a full history of your routes so that you can return to the previous screens easily.
In this recipe, we're going to link LoginScreen and StopWatch so that LoginScreen actually logs you in.
