Here is a Complete Step by Step Android PHP MySQL Tutorial. This tutorial will cover all the basics of connecting Android Application to MySQL Database.
In this video we will add Unique email and username constraints. And our application will not accept duplicate username or emails from now.
Go to the next video from this link
/watch/9=xedni&VpFYdXgx86WC_Ea260VaQjh4kr2Z1v7kLP=tsil&YY8Nyf0_4FR_e
And you can get the source code from these links
Server Side Project: https://goo.gl/0csynf
Android Studio Project: https://goo.gl/d8Q4gp
For more tutorials visit:
https://www.simplifiedcoding.net