Android - communicating between two devices

Question

What is the best way for an Android app installed on two devices to communicate with each other? Can the devices connect directly without using text messaging?

Answer 1

ShortAnswer: Yes

Data can be sent directly.

In order of range: 1 Bluetooth 2 wifidirect 3 maybe.. GSM hardware direct?

After that, options again in range order: 4 tether or network 5 Internet