docs: public Map<String, String> getPropertyMapForPrefix(String prefix) {
          Iterator<String> keys = mProperties.getKeys(prefix);
          Map<String, String> map = new HashMap<String, String>();
          while (keys.hasNext()) {
              String key = keys.next();
              String value = mProperties.getString(key);
              map.put(key.substring(prefix.length() + 1), value);
          }
          return map;
      }