If you’re still waiting for the official Moodle app for Android this is a resource you might want to check out. The Unofficial Moodle Mobile app was created and released by Juan Leyva and supports Blackberry and Android.
This is no ordinary plugin though, the code released provides all the tools to create and release your site-specific app to any App Store. Customize the app to your liking before releasing it to your teachers and students.
Plugin Directory: http://moodle.org/plugins/pluginversions.php?id=175
Read more about the app here: http://docs.moodle.org/22/en/umm:_Unofficial_Moodle_Mobile_app
Download it here: https://github.com/jleyva/umm
For more mobile info check out http://lmspulse.com/mobile/