Fragment

Fragment

1. Defini

   • Small version of Activity;
     • On Create, resume, pause , delete
     • onAttach, onDetach, onActivityCreate
       • onDestroyView, onViewStateRestored
   • More dynamic, flexible

2. Start

   • dynamic
     • id/Tag
   • Static: <frag name="" />
     • without UI, noOnCreateView

3. Transaction

   • add (R.id, fragment, tag)
   • replace( R.id, fragment)
   • commit/ commitAllowStateLoss
     • Commit before Actitity save instance
   • addToBackStack(null);
     • before commit: user nav to previous frag State

4. Frag <=> Act

   • getActivity().finViewById of act layout
   • FragmentManger.getFrag by id/tag
     • id for UI
     • Tag: dynamic
   • Listener

5. Context menu Actionbar

   • register onCreateOptionMenu
     • setHasOptionMenu on onCreate