code: @Override
      public String toJSON() {
          try {
              JSONObject o = new JSONObject();
              o.put(KEY_TYPE, mType);
              o.put(KEY_TITLE, mTitle);
              o.put(KEY_MESSAGE, mMessage);
              return o.toString();
          } catch (JSONException e) {
              Log.e(TAG, "Error marshalling:", e);
              return "";
          }
      }
docs: /*
  (non-Javadoc)
  
  @see it.polimi.spf.framework.local.SPFAction#toJSON()