Some folks that go by the name IBF Programs named “Steam for Android,” and while the name makes it sound as if the application is official, it isn't. It's a third party companion app that helps users keep up to date with their friends' activity on the go, the daily specials Steam tends to offer and a lot more. If ever there needed to be an official Steam app for Android, we'd implore the PC games repository company to contract IBF as they have really done a nice job on the user interface here.
Android Phone, Steam for Android App Isn't Official, But Still a Good Companion for Steam Users