Hide bottom navigation when scrolling

[fireph]

This uses the coordinator layout behavior to hide the BottomNavigationView when scrolling down and having it reappear when scrolling up. It is toggle-able as a checkbox in the settings and the FloatingActionButton follows it correct when hiding/showing. It will also properly re-show bottom nav when toggling the setting off if the bottom bar is currently hidden.

If you are ok with having this behavior be the default, I can remove the settings toggle and remove the if/else statements to simplify everything.

Also tested with snackbars and it works correctly (that is why the inner coordinator layout is needed). There can be some finicky-ness with padding on the snackbars in some cases. 😕

See the video below for how it works with the setting enabled and disabled.

[fireph]

643

[FredJul]

Hi again, I have merged this excellent work, but noticed too late a little regression: the "mark all as read" fab is hard to select when the bottom navigation bar is hidden because it is under the Android home/back bar. Do you have an idea on how to solve that ?

[FredJul]

Actually I found two other bugs:

• I'm not sure why but sometimes the bottom bar does not reappear, even if I scroll up (after I tapped on the notification).

• the bottom of the last item can be hidden (we can't see the last feed name):

Unless we find a solution I unfortunately may have to revert the bottom bar hiding (no problem so far with the top bar). But I'll pretty sure we can find one 😉