Android - Get preference from activity to broadcast receiver

I'm developing an Android app but I have a problem. When I try to get a saved preference from my Activity and use it in a BroadcastReceiver , it tells me that string I'm looking for doesn't exist.

PreferenceActivity has missing icon on Honeycomb

I've created a simple PreferenceActivity containing a ListActivity. (code added at the end for completeness) but it shows up differently on a 2.3 device and on a Galaxy Tab 10.1" (Android 3.2) (see images below).