The Stream Android SDK by Stream allows API interaction to access activity streams and news feeds data. See how an app works at https://github.com/GetStream/stream-analytics-android/tree/master/sample
There are a number of ways of delivering data in real-time but until recently it has looked like PubSubHubbub, with the backing of Google, was going to be the preferred method. However, the past couple of weeks have seen a couple of interesting developments which could indicate that the developer community may actually prefer HTTP Streaming.
With the real-time web being claimed by some to be one of the core components of Web 3.0 it's unsurprising that we are seeing more real-time APIs and real-time mashups being developed. One mashup has just been created using Kwwika and Superfeedr to demonstrate how two real-time platforms can be integrated to create a real-time news reader application.
Our API directory now includes 53 feeds APIs. The newest is the App.net API. The most popular, in terms of mashups, is the Google Ajax Feeds API. We list 45 Google Ajax Feeds mashups. Below you'll find some more stats from the directory, including the entire list of feeds APIs.