When using standard Android apps (like Gmail) which have multiple items to select, a contextual action bar (CAB) comes up showing a checkmark (tick) and some other information (such as "3 selected").
The problem comes in with the behaviour of the checkmark / tick, which clears the selection. In fact the Android Design Guidelines state:
Dismiss the CAB via the navigation bar's Back button or the CAB's checkmark button. This removes the CAB along with all selection highlights.
This seems to go against the standard of using an
X icon to clear, which is used everywhere that I can see other than selections.
What is the reason for using a checkmark instead of the standard
X icon to clear a selection? Would it be improved with the X icon instead?