This method is called whenever the user chooses to navigate Up within your application's
activity hierarchy from the action bar.
If a parent was specified in the manifest for this activity or an activity-alias to it,
default Up navigation will be handled automatically. See
#getSupportParentActivityIntent() for how to specify the parent. If any activity
along the parent chain requires extra Intent arguments, the Activity subclass
should override the method
#onPrepareSupportNavigateUpTaskStack(android.support.v4.app.TaskStackBuilder)to supply those arguments.
See Tasks and
Back Stack from the developer guide and
Navigation from the design guide
for more information about navigating within your app.
See the
android.support.v4.app.TaskStackBuilder class and the Activity methods
#getSupportParentActivityIntent(),
#supportShouldUpRecreateTask(android.content.Intent), and
#supportNavigateUpTo(android.content.Intent) for help implementing custom Up navigation.