Re:The growing body of evidence that digital distraction is ...
by nitemice on Monday January 08, 2018 @05:15PM
(#16101241)
Your last use-case is sort of covered by Android's screen pinning feature[0]. You have to enable it in settings, but it's useful, and seems to work well.
[0] https://support.google.com/nexus/answer/6118421?hl=en This link is for Nexus, but I think it's included in all version of Android since 5.0 Lollipop.