title: Refresh android PreferenceFragment
body: <p>I have a <code>CheckBoxPreference</code> in a <code>FragmentPreference</code>. When the user active the check box, I check if an application is installed and if not, I reset the preference on false and I open the <em>Play Store</em> to download the app.</p>
  
  <p>Basically all works fine, but I have an issue to refresh the UI. Indeed, even if I set the preference on false before opened the <em>Play Store</em>, when the user come back, the box is checked (the fragment has just been paused and resumed so the preference value is ignored).</p>
  
  <p>Is there a way to "refresh" the activity or the fragment?   </p>