A TODO list application was written by a GCI student:

http://www.google-melange.com/gci/task/view/google/gci2014/5057042301583360

This application works fine but it doesn't have a feature to synchronize the tasks with a "cloud" based service.

Make the required changes to the application (possibly reusing code from http://www.google-melange.com/gci/task/view/google/gci2013/5318100849262592 ) so it synchronizes the tasks with an online service.

You can use Haiku network kit for HTTP requests and parsing JSON files.