Listener for receiving events when
ActionBar items are shown or hidden.
Note: This interface is included in the support library for compatibility
with API level 7 and higher. If you're developing your app for API level 11 and higher
only, you should instead use the framework
Called when an action bar menu is shown or hidden.
Called when an action bar menu is shown or hidden. Applications may want to use this to tune auto-hiding behavior for the action bar or pause/resume video playback, gameplay, or other activity within the main content area.
|isVisible||True if an action bar menu is now visible, false if no action bar menus are visible.|