Sky+ app update lets Android devices control Sky TV
If you want the new features, you'll need a device running Android 2.2 Froyo or later. Which is pretty much any Android device released since 2010. If you're still stuck on 2.1 or earlier, you won't be able to update to use the new functions, though ...
Sky+ Android app gets remote control powers at last
Sky+ remote control app arrives on Android
Sky+ Android app enables Sky TV remote control