I am developing apps for both Android and iPhone, and am looking for how I can push notifications to both (if you only have an answer for one, that’s ok, I’m sure someone has an answer for the other).
For example, if I’m having a special on something and want to notify people so it sort of dings and a message pops up (I have a Groupon app that does that) how can I accomplish this? And do I have to reprogram each time, or can I do it through an RSS or something else?
For Android 2.2+ use C2DM. Apple also has a proprietary push notification service. In both cases you need to register with the company to use the system. Also in both cases you will need a web server able to communicate to Google and Apple.