How should Android back button behave when it's not possible to go back to previous screen?

1. How does the Android back button work?

How does the Android back button work?

When you press the Back button, the current destination is popped off the top of the back stack, and you then navigate to the previous destination. The Up button appears in the app bar at the top of the screen. Within your app's task, the Up and Back buttons behave identically.