This is an android client for Mastodon, a GNU Social-compatible microblogging server. Presently, it is in active development and its current state does not represent the features or design of the final program.
The project uses the Gradle build system. Android studio uses Gradle by default, so it’d be straightforward to import this repository using your chosen version control software from the menu:
VCS > Checkout from version control > Git/SVN/Mercurial
After making it into an android studio project you can build/run as you wish.
It’s also possible to build using Gradle by itself on the command line if you have it installed and configured. This repository includes a gradle wrapper script that can be used, following this guide Build You App On The Command Line.