Whether it is a course from your university or your favorite MOOC course, you now have the ability to not only to learn the lessons but also perform the associated projects and assignments.
No software or other infrastructure required – all you need is a browser and your mobile device. Start by learning to build Android apps with Google's Training for Android Developers.
Build your applications and share them with friends and prospective employers alike. You can even publish the associated source code to really showcase your skills.