Version 2.4 * completely rewrite UI architecture (use ViewModel instead of Loaders) * improve robustness and responsiveness, especially when there are a lot of collections * improve UI to make it more Material (for instance, use progress bars instead of deprecated progress dialogs) * improve read-only contact behavior (contacts from read-only address books are now marked as read-only; in most Contact apps, you can still edit those contacts, but the changes will not persist) * notify on invalid events, too (since 2.3, invalid tasks/vCards cause notifications) * library and translation updates * other improvements and bug fixes