@Override
  public String toString() {
    StringBuilder sb = new StringBuilder("(");
    sb.append("\"").append(mainText).append("\"");
    sb.append(" at ").append(Arrays.toString(mainTextMatchedSubstrings));
    if (secondaryText != null) {
      sb.append(", secondaryText=\"").append(secondaryText).append("\"");
    }
    sb.append(")");
    return sb.toString();
  }
The secondary text of a prediction, usually the location of the place.
src/main/java/com/google/maps/model/AutocompleteStructuredFormatting.java