I'm developing android app. It's some sort of social network. Where user can add friend and some few stuff. I've been working on php for quite a time now. But android is **totally new** for me. The app will be served by a web service. 
My android skill are not good. So total time I spend on working on android part is more. So I'm thinking is there any framework that can be used to serve my application. With this I can reduce time to implement web service. I know some of framework but as I have not worked with them, I don't know how much they can be extended to fit in my need. **OR** should I implement it by my own without any framework ?

All the suggestions, advises will be extremely helpful.