Android : Rest API client with Pop-up feature

Looking to get a project done with RestFul services running as a background service. Implementation includes: 1) Run as a Background process or Service 2) Facebook Chat messenger like pop-up for displaying notification. 3) RestFul calls at specific intervals 4) "Shaking the phone" would be a feature in this App to run/display notifications 5) Need high quality UI Overall, this should be a pretty simple and straightforward project. Rest of the details will be shared with the awardee.