Dear sir,
I can help you. I am an expert in android and iOS, your requirements is cool for me.
I will make sure that I deliver you the best with 100% accuracy in minimum time.
Pay milestone only if you are 100% satisfied with my work, after project delivery.
If you have full source code for android , then please send me it.
I will integrate facebook library,
I look forward to working with you!
Thank you and regards.