My Gradle plugin to support annotation processors in Android Gradle builds & Android Studio, android-apt, got another update! Version 1.2 now also supports library projects. This version requires the android plugin version 0.7 or up, since that version supports a new API that I use in the plugin. So upgrade your Android Gradle builds and generate some code :)
Check out the project site for more info and docs: https://bitbucket.org/hvisser/android-apt