Moving on

NullPointerException(when switching off the screen)
http://stackoverflow.com/questions/8748064/starting-activity-from-fragment-causes-nullpointerexception

Fragment calling Fragment (the next big headache)
http://blog.radioactiveyak.com/2011/02/android-app-surgery-earthquake-redux.html
http://stackoverflow.com/questions/9281797/cant-refresh-data-in-listfragment#_=_

Communications between Fragments
http://stackoverflow.com/questions/5194548/how-to-pass-data-between-fragments