How do I inflate a toolbar in PreferenceFragment?

In PreferenceFragment, the view is inflated like so

addPreferencesFromResource(R.xml.preferences);

and not by creating a view object and inflating it. So now, if I want to implement a toolbar in my settings fragment, which extends PreferenceFragment, I need to do this:

addPreferencesFromResource(R.xml.preferences);
toolbar = (Toolbar) findViewById(R.id.toolbar);
((ActionBarActivity)getActivity()).setSupportActionBar(toolbar);

but without a view object, how am I supposed to use findViewById?