title: Notify other activity of a preference changed
body: <p>I'm trying to have the main activity notified of a change in preferences in the PreferenceActivity but the onSharedPreferenceChanged  is not firing when I change the preference.</p>
  
  <pre><code>    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
      prefs.registerOnSharedPreferenceChangeListener(new OnSharedPreferenceChangeListener()
      {   
          public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
          {
              Log.d("Dict", "PreferenceChanged: " + key);
          }
      });
  </code></pre>