Settings submenus should have up/back button

[logkirk]

I am using the Wallabag app on a Supernote e-ink device, which does not have a physical back button. I ran into an issue where I navigate into a Settings submenu (hamburger icon > Settings > any menu, i.e. Connection) but cannot navigate back out because there is no 'up' button as I expect in the upper left corner of the screen. I have to force kill the application and relaunch it in order to get back to the main screen.

I considered posting this as a comment in issue https://github.com/wallabag/android-app/issues/168, however I think it should stand alone as a separate issue since Google Material Design guidelines make the following recommendation:

Upward navigation should be implemented for all child screens in an app and follow platform guidance. Android and web apps should use the Material Up action ...

Here's a link to an image from the design guidelines page demonstrating how I believe it should be implemented.

Thanks!