Dart Base64Utils

 import 'dart:convert';

import 'dart:io';
import 'dart:typed_data';

class Base64Utils {
  ///Create one function and pass file path, It will return Bytes.
  static Future<Uint8List> _readFileByte(String filePath) async {
    Uri myUri = Uri.parse(filePath);
    File audioFile = new File.fromUri(myUri);
    Uint8List bytes;
    await audioFile.readAsBytes().then((value) {
      bytes = Uint8List.fromList(value);
      print('reading of bytes is completed');
    }).catchError((onError) {
      print('Exception Error while reading audio from path:' +
          onError.toString());
    });
    return bytes;
  }

  ///get base64 string from full filePath

  static Future<String> getBase64String(String filePath) async {
    try {
      Uint8List fileBytes = await _readFileByte(filePath);
      String base64String = base64.encode(fileBytes);
      return base64String;

//      _readFileByte(filePath).then((bytesData) {
//        Uint8List fileBytes = bytesData;
//
//        ///do your task here
//        print('DO TASK');
//        print('--DO TASK:'+filePath);
//        String base64String = base64.encode(fileBytes);
//        print(base64String);
//        return base64String;
//      });
    } catch (e) {
      // if path invalid or not able to read
      print(e);
    }
    return '';
  }

  static Future<String> getBase64StringFromByteData(ByteData byteData) async {
    try {
      Uint8List fileBytes = byteData.buffer.asUint8List();
      String base64String = base64.encode(fileBytes);
      return base64String;
    } catch (e) {
      // if path invalid or not able to read
      print(e);
    }
    return '';
  }

  /// base64 encode and decode string
  static String encode(String str) {
    var bytes = utf8.encode(str);
    return base64.encode(bytes);
  }

  static String decode(String encodedString) {
    var data = base64.decode(encodedString);
    return utf8.decode(data);
  }
}