In this article, we discuss how to use a web API from within your Android app, to fetch data for your users. There are two major methods for retrieving data from most web services, XML or JSON.

Via the Awareness API an app can get data about what Android has inferred about what is going on. That way an app can tell when a person is in a moving vehicle, when a person is in a vehicle ...

Android applications can retrieve data from Web services on any device with a connection to the Internet, whether over a wireless network or the user's mobile phone network.