Version 7.16.03 from October 2019 has an option to select GRC Pool and 'mine' gridcoin.
Or a direct download link from Berkeley to apk file here.
Google Play version is older, from 2016 and does not have an option to attach GrcPool. I was reading so many posts on how to edit BOINC app so I was not looking for an official version. But here we are and I installed it today.
Instructions: There was a great description with screenshots in this Publish0x post. With an exception that BOINC software can be downloaded from the official site above.
Download version 7.16.03 from BOINC website (not Google play)
Register at https://grcpool.com/
in menu select "add project", then "add account manager", then select Grcpool and login with your credentials.
Select projects you like to compute at https://grcpool.com/. Save your selection! (Tip: Rosetta requires more memory. World community grid runs on almost all devices incl. very old tabs).
Go to BOINC and sync with Grcpool.
There will be a couple of days till you see credits in GrcPool. GRC address has to be added to transfer Gridcoins.
This version is a testing version and may not work properly on all devices.
Check and change BOINC set up to select best options to manage BOINC: when charging, temperature limits, CPU numbers.
My phone is not heating up if works on all CPUs and not moved. When in pocket, it may heat so set a lower limit. Maybe 35 grad.
Where to stake GRC? More in this article:
Even more in this group:
Gridcoin website: https://gridcoin.us/