Facebook API integration in to android app

We are interested in adding facebook api so the users will be able to do the following: -Sign in with facebook account - Do check in when ever the user recycle - Show the profile photo of the user who have done the most check in's every week – Show on the search results profile photos of users who had checked in recently -Create recycling events (using the FB events option) -Send messages between users *See attached spec for more details (relate only to the green remarks) -Only experience android programmers with facebook API experience please -We will give full support for programmer questions during the process through skype -Job need to be done with in 7 days from the moment of hiring -An update include source and apk file need to be sent once a day