This app was mentioned in 4 comments, with an average of 3.00 upvotes
https://play.google.com/store/apps/details?id=com.brstf.simplelife
Since op said they had no direct plans on porting it currently I have no problems plugging this. It was posted maybe a year ago on here. Absolutely love it
For 1v1 matches I use Simple Life, https://play.google.com/store/apps/details?id=com.brstf.simplelife and Clean MTG, https://play.google.com/store/apps/details?id=duensing.andrew.lifecounterfree.android for multiplayer. Now that one does show as having ads now but I've never seen one and have used the app for a couple years.
You could use simple life! A redditor made it and it is free, so basically it is perfect.
https://play.google.com/store/apps/details?id=com.brstf.simplelife&hl=en
Best life-counter I have found so far. Easy to use, looks great. Doesn't work good for commander though.