code: private void updateIntervalText() {
          if (mIntervalResId == -1) {
              return;
          }
  
          final String INTERVAL_COUNT_MARKER = "%d";
          String intervalString = mResources.getQuantityString(mIntervalResId, mModel.interval);
          int markerStart = intervalString.indexOf(INTERVAL_COUNT_MARKER);
  
          if (markerStart != -1) {
              int postTextStart = markerStart + INTERVAL_COUNT_MARKER.length();
              mIntervalPostText.setText(intervalString.substring(postTextStart,
                      intervalString.length()).trim());
              mIntervalPreText.setText(intervalString.substring(0, markerStart).trim());
          }
      }
docs: TODO Test and update for Right-to-Left