Where to learn to create android apps?

Question

My profesor is not teaching us to create mobile apps. Then he gave us project to create android apps for thesis. what should I do? My focus is web development. but in my case I should learn OOP but where and how? Need some tips and suggestions guys

Answer 1

https://developer.android.com/training/basics/firstapp/index.html
http://www.tutorialspoint.com/android/