title: References a separate Android preference screen from within another Preference Screen in XML
body: <p>I have two Android Preference Screens defined in my Android app in XML.</p>
  
  <p>For example, Screen 1</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;PreferenceScreen 
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:key="screen1"&gt;
      &lt;PreferenceCategory android:title="Preferences"&gt;
          &lt;CheckBoxPreference 
              android:defaultValue="true"
              android:title="test"
              android:key="test_pref"/&gt;
      &lt;/PreferenceCategory&gt;
  &lt;/PreferenceScreen&gt;
  </code></pre>
  
  <p>and Screen 2</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;PreferenceScreen
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:key="screen2"&gt;
      &lt;CheckBoxPreference 
          android:key="checkbox" 
          android:title="Checkbox"&gt;
      &lt;/CheckBoxPreference&gt;
  &lt;/PreferenceScreen&gt;
  </code></pre>
  
  <p>I would like screen 2 to be a separate screen to be accessible in its own right but I would also like its preferences to be a part of screen one also. 
  Is there a simple way I can simply reference screen 2 from within screen 1? 
  Or do I just need to essentially repeat the same preference stuff in a sub preference screen in Screen 1. </p>