Forwarding from mobile-l:
Dear Mobile Wikimedians,
The Android app recently upgraded to the latest version (24.0.0) of the
Android support library, which requires Java 8 in order to build.
Accordingly, Java 8 is now required to build the Android app.
As of about an hour ago, our CI jobs have moved from using Java 7 to Java
8. Details are here: https://phabricator.wikimedia.org/T138506
Big thanks to @hashar for making the CI change!