/**
  * Returns a Facebook profile picture url.
  *
  * @param id The id of the profile.
  * @param type The type of the picture.
  */
 public static String getProfilePicture(String id, PROFILE_PICTURE_TYPE type) {
   String url = null;
   if (id != null && !id.isEmpty()) {
     url = "https://graph.facebook.com/" + id + "/picture?type=" + type.getValue();
   }
   return url;
 }
 public static PROFILE_PICTURE_TYPE fromString(String text) {
   if (text != null) {
     for (PROFILE_PICTURE_TYPE category : PROFILE_PICTURE_TYPE.values()) {
       if (text.equalsIgnoreCase(category.value)) {
         return category;
       }
     }
   }
   return null;
 }