Welcome to the demos and exercises accompanying ud867 at Udacity!
Each directory contains a README.md or solution.gradle that will explain either the concept being explored or the exercise at hand. For each exercise, hints and a solution.gradle file are also provided.
This course is specifically concerned with the app build process, not writing apps in the first place. If you're just starting out on your Android journey, you might want to take Udacity's Developing Android Apps course.