Hi,
As far as I know, There are many certification courses in Android, I am sharing with you list. it will helpful for you.
Java Fundamentals for Android Development
Professional Android Apps Development
ATC Android Application Development
Expert Android Apps Development
ATC Monetize Android Application
ATC Android Security Essentials
You can learn some basic concepts with the help of W3C School. If you want to get training for Android certification, than I would like to recommend Koenig Solutions.
http://www.koenig-solutions.com/android-training-certification-courses.aspx