I have a two level PreferenceScreen:

<PreferenceScreen>
general settings
   <PreferenceScreen android:key="adv_settings">
   more advanced settings
   </PreferenceScreen>
</PreferenceScreen>

My problem is that the second screen doesn't show the back/up button on the action bar automatically. How do I make the up button appear on adv_settings?

java android android-actionbar
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