UX - spec Android back button

[xmatthewx]

Define how system back button should behave.

Here's a first attempt:

• dismiss dialogs
• close keyboard
• back to prior tab (make/discover)
• back to prior view (from user profile, tinker mode, element editor, project settings,...)
• zoom out from page view to map view
• zoom in ?? (I vote never)
• exit a project (with a confirmation??)
• exit the application only if there's absolutely nothing else to do (I've seen accidental exists intercepted with a prompt, "tap back again to exit app.")

[xmatthewx]

cc @flukeout

[flukeout]

Seems like back arrow to zoom out is the most important one - saw lots of going back to Discover view by 'accident'.

Not sure about back to previous tab (between make & discover) - seems like you'd get stuck in a cycle going back and forth? Doesn't seem like the right interaction, is that what you meant?

[xmatthewx]

Seems like back arrow to zoom out is the most important one

Agreed. Important and unique.

back to previous tab

I think it would go back to whatever you did before you hit the tab, not add your tab-via-back-button to the queue. I agree it's a bit confusing. We should just follow material design's lead on this one.

[xmatthewx]

closing. ready to implement in #1546