title: How to add toolbars to AppCompatPreferenceActivity?
body: <p>I'm trying to add toolbars to the <a href="https://android.googlesource.com/platform/development/+/nougat-release/samples/Support7Demos/src/com/example/android/supportv7/app/AppCompatPreferenceActivity.java" rel="nofollow noreferrer">AppCompatPreferenceActivity</a> but I don't know how to do so.</p>
  
  <p>Can you tell me how?</p>