code: public static String convertToBitcoinURI(Address address, Coin amount,
                                               String label, String message) {
          return convertToBitcoinURI(address.getParameters(), address.toString(), amount, label, message);
      }
docs: Simple Bitcoin URI builder using known good fields.
  
  @param address The Bitcoin address
  @param amount The amount
  @param label A label
  @param message A message
  @return A String containing the Bitcoin URI