title: Touching two phones together to send data
body: <p>I'm trying to develop an application like Bump to receive data from another device by touching them together. I could not find any tutorial on Google about this. Can somebody help me make an idea about how this works? What programming language should I use, how can I do it by using Bluetooth or/and Wifi, etc? I only need some info. I don't know where to start. Thank you!</p>