Share a VCF Card in Flutter using the Native Share Sheet

VCF_Card_Flutter.dart

import 'dart:io';

import 'package:contacts_service/contacts_service.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_extend/share_extend.dart';

/// Share a VCF Card from a Contact Object
void shareVCFCard(BuildContext context, {Contact contact}) async {
  final Contact _info = contact;
  if (_info != null)
    try {
      var _data = _vcfTemplate(_info);
      var _vcf = await _createFile(_data);
      await _readFile();
      _vcf = await _changeExtenstion(".vcf");
      if (_vcf != null) {
        ShareExtend.share(_vcf.path, "file");
      }
    } catch (e) {
      print("Error Creating VCF File $e");
      return null;
    }
}

Future<String> get _localPath async {
  final directory = await getApplicationDocumentsDirectory();
  return directory.path;
}

Future<File> get _localFile async {
  final path = await _localPath;
  return File('$path/contact.txt');
}

Future<String> _readFile() async {
  try {
    final file = await _localFile;
    String contents = await file.readAsString();
    print("Contents: $contents");
    return contents;
  } catch (e) {
    print(e);
    return "";
  }
}

Future<File> _createFile(String data) async {
  final file = await _localFile;
  print("Data: $data");
  return file.writeAsString('$data');
}

Future<File> _changeExtenstion(String ext) async {
  final file = await _localFile;
  var _newFile = file.renameSync(file.path.replaceAll(".txt", ext));
  print("New Path: ${_newFile.path}");
  return _newFile;
}

String _vcfTemplate(Contact contact) {
  final Contact _info = contact;
  try {
    String str = "";
    str += "BEGIN:VCARD\n";

    str += "VERSION:4.0\n";

    str += "N:${_info?.familyName};${_info?.givenName};;;\n";

    str += "FN:${(_info?.givenName ?? "") + " " + _info?.familyName}\n";

    if (_info?.company != null && _info.company.isNotEmpty)
      str += "ORG:${_info?.company}\n";

    if (_info?.jobTitle != null && _info.jobTitle.isNotEmpty)
      str += "TITLE:${_info?.jobTitle}\n";

    if (_info?.phones != null && _info.phones.isNotEmpty) {
      int _index = 1;
      for (var _item in _info.phones) {
        if (_item != null) {
          str +=
              "TEL;PREF=${_index.toString()};TYPE=${_item?.label?.toUpperCase()}:${_item?.value}\n";
          print("Added => Phone ${_item?.label} | ${_item?.value}");
        }
        _index++;
      }
    }

    if (_info?.emails != null && _info.emails.isNotEmpty) {
      int _index = 1;
      for (var _item in _info.emails) {
        str +=
            "EMAIL;PREF=${_index.toString()};TYPE=${_item?.label}:${_item?.value}\n";
        print("Added => Email ${_item?.label} | ${_item?.value}");
        _index++;
      }
    }

    if (_info?.postalAddresses != null && _info.postalAddresses.isNotEmpty) {
      int _index = 1;
      for (var _item in _info.postalAddresses) {
        str +=
            "ADR;PREF=${_index.toString()};TYPE=${_item?.label}:;;${_item?.street}\, ;${_item?.city};${_item?.region};${_item?.postcode};${_item?.country}\n";
        print("Added => Address ${_item?.label}");
        _index++;
      }
    }

    str += "REV:20080424T195243Z\n";

    str += "END:VCARD";

    return str;
  } catch (e) {
    print("Error Creating VCF Data $e");
    return null;
  }
}