extractCargoId
Extracts the cargo ID from the savedInstanceState or arguments bundle by reading the com.grarcht.shuttle.framework.model.ShuttleParcelCargo parcelable stored at the image cargo key.
Return
the cargo ID string, or an empty string if no cargo reference is found.
Parameters
savedInstanceState
the saved instance state bundle, used on configuration change.
arguments
the intent extras bundle, used on first launch.