Sample android application with sync

We need to create a sample android application which will have one form. The data entered in the form should be saved on mobile database using ROOM and once mobile data is available, it should sync with the server. Need to submit working code and need to explain code to our developer which will integrate it in our project. Use best practices of java and android. You need to provide sample REST web service on your test server which will be accessed from the app for testing purpose. Tools to be used : Android Studio, Lollipop and above, responsive theme Documentation : Standard documentation required. Last date for project delivery will be 5th January 2018. Any one who is expert on above skills and wish to get highest rating is welcomed.