如何在PreferenceFragment中设置操作栏中的后退按钮？

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        getActivity().onBackPressed();
        return true;
    }
    return super.onOptionsItemSelected(item);
}

getSupportActionBar().setDisplayHomeAsUpEnabled(true);