@Fran-Diox I agree, but not entirely. I feel there is a legitimate reason to have a notification window prevent the device back button from working. FOr example, my app might alert the user, “Hey stupid, pay up or your account is deleted tomorrow!”. I’m sure you’re like me and probably everybody else on the planet, you’ve hit the back button on a notification in “real” apps out of instinct without ever reading them. Very much like clicking “Accept” without reading the EULA for a program. But some notifications should be purposfully interacted with, such as my example. The user should not be able to click outside the notification box to close it, and should not be able to click the device back button to close it… instead, the user should b required to click “OKAY” or whatever the notification button is.
But, even if we disagree with expected behavior, I think there is one thing that seems natural: if I have a non-cancelable notification visible, hitting the device back button causing the app to close doesn’t make sense. If the notification is cancelable=false, and you hit the device back button, the app closes… that seems the exact opposite of cancelable, but on a larger scale… instead of “not canceling” the notification, it cancels the app.