Android中为Fragment添加Menu的方法

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto">    
  <item android:id="@+id/menu_item_new_crime"        
    android:icon="@android:drawable/ic_menu_add"        
    app:showAsAction="ifRoom|withText"        
    android:title="new crime">    
  </item>
</menu>

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);     
    inflater.inflate(R.menu.fragment_crime_list, menu);
}

setHasOptionsMenu(true);

@Override
public void onCreate(Bundle savedInstanceState) {    
  super.onCreate(savedInstanceState);    
  getActivity().setTitle(R.string.crimes_title);    
  crimes = CrimeLab.get(getActivity()).getmCrimes();    
  setListAdapter(new CrimeAdapter(crimes));    
  setHasOptionsMenu(true);  // 这是关键的一句
}