I don’t want to duplicate the posts, so will refer to the github issues:
It would be really great to revive this app. It’s my favorite one when it comes to Android, and I still use the old version. Now it compiles and we could try to push it further 
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Great job!
I think the best solution would be to fork it, because if it isn’t maintained anymore I don’t think that somebody will read your pull request.
OK, could you check if it compiles?
It still runs the published version of dronekit, I got stuck on multiple definitions of mavlinkprotocol in different places, has someone had any success in compiling dronekit and integrating it with Tower?
I have removed my google API map key, is there any key left from 3DR?