QuickAction Bar

A quick-action widget is part of the evolving Android UI design pattern as explained here, here, and here, among others.

Menu (pop-up, drop-down, etc) is very familiar concept in desktop computing environment, where applications are relatively complex and presenting easy access to features/menu/commands are crucial for the usability of the applications. Mobile apps are now also becoming more complex and richer in features, which makes providing easy access to the available actions as important as it is in the desktop environment.

With widgets such as the DroidUX's QuickActionBar, QuickActionGrid, and DropDownMenu, it is fast and easy to presents important or frequently used actions/functionalities in your app to the users, which results in greater usability of your app and more pleasant experience for your users.