I created an App using android material design support library and it works perfectly fine.I have tried to include Activity transitions using this library here but i don't know where to start since it's built with gradle and I've no idea about it.(I'm using intellij idea for my project).Thanks in advance.
Using this library is very simple and works exactly like all other gradle libraries with public aar distributions. You can find tons of information on the Internet. For example: https://www.youtube.com/watch?v=3Euo6xzCwY4
And btw, this library works only on Lollipop and Marshmallow. Official activity transitions are only for 5.+. This backport library should work: https://github.com/takahirom/PreLollipopTransition. You can also find few ideas on YouTube: https://www.youtube.com/watch?v=S3H7nJ4QaD8