android 4

Fragment 子类：DialogFragment ; ListFragment ; PreferenceFragment

onCreate

public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle saveInstanceState){

return inflater.inflater(R.layout.xxx,container,false);

}

onPause

* Fragment 添加到一个已存存的ViewGroup

FragmentManager fragmentManager = getFragmentManager();

FragmentTransaction  fragmentTransaction = fragmentManager.beginTransaction();

XXXFragment fragment = new xxxFragment();

fragmentTransaction.add(R.id.xxxViewGroup,fragment);//or replace addToBackStack(null);

fragmentTransaction.commit();

getActivity()  //从fragment 取的activity

getFragmentManager().findFragmentById(R.id.xxxfragment);//从activity 取的fragment

 *actionBar

ActionBar actionBar = getActionBar();

actionBar.hide();

onCreateOptionMenu() 生成actionBAR 和浮动式菜单