Based on answers from http//gamedev.stackexchange.com/questions/89/2d-gaming-libraries-frameworks-engines-for-android , it looks like your best options are libGDX (http//libgdx.badlogicgames.com/) and AndEngine (http//www.andengine.org/). You can learn about either of them from the tutorials on their sites.
I looked intro both of them, and thats what I found out:
1) LibGDX is crossplatform and more of a graphical library than a game lib/engine.
2) AndEngine is for android only and it is more friendly for newbies.
Based on that I think that AndEngine is more suitable for my needs because I need to develop games only for android an I'm not interested in making 3D games.
Thank you for you assistance.