Great news for Android Moodlers, the official Moodle mobile app is currently under development!
According to the Moodle.org Developer meeting minutes [link],
We have hired a company to create android app based on our iPhone app. The code will be a complete rewrite as it needs to be in Java and the iPhone app is written in Objective C, but the functionality should be the same and the same web services will be used. The code will be GPL and available on Github. The Android app is expected to be ready around Christmas or soon after.