Update the Target SDK to a newer android version (Google Play requires 26 or higher) and implement all the code changes required to make it happy. Right now it's in a bastardized state of targetting SDK 22 but making use of features from 23, compiling with 26, and requiring a minimum of 16.
Update the Target SDK to a newer android version (Google Play requires 26 or higher) and implement all the code changes required to make it happy. Right now it's in a bastardized state of targetting SDK 22 but making use of features from 23, compiling with 26, and requiring a minimum of 16.