title: Android - How to retrieve list of registered geofences
body: <p>How can I determine all geofences registered for an application?</p>
  
  <p>After registering GeoFences with <code>LocationClient.addGeofences()</code>，I waited for <code>onAddGeofencesResuls()</code>（which returned SUCCESS) and tried to use <code>LocationClient.getTriggeringGeofences(intent)</code> with the same intent I used for registration, but I only got <code>null</code>.</p>