Flutter CSV 5.0.0 - Export List Data to CSV file

name: flutter_csvfile
description: A new Flutter application.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  csv: ^5.0.0
  path_provider: ^2.0.2
  permission_handler: ^7.1.0

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter

 (await Permission.storage.request().isGranted) 

String dir = (await getExternalStorageDirectory())!.path + "/mycsv.csv";
String file = "$dir";

File f = new File(file);

import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:csv/csv.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';

import 'csv_to_list.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  late List<List<dynamic>> employeeData;

  @override
  initState(){
    //create an element rows of type list of list. All the above data set are stored in associate list
//Let associate be a model class with attributes name,gender and age and associateList be a list of associate model class.


    employeeData  = List<List<dynamic>>.empty(growable: true);
    for (int i = 0; i <5;i++) {

//row refer to each column of a row in csv file and rows refer to each row in a file
      List<dynamic> row = List.empty(growable: true);
      row.add("Employee Name $i");
      row.add((i%2==0)?"Male":"Female");
      row.add(" Experience : ${i*5}");
      employeeData.add(row);
    }
  }

  getCsv() async {

    if (await Permission.storage.request().isGranted) {

//store file in documents folder

      String dir = (await getExternalStorageDirectory())!.path + "/mycsv.csv";
      String file = "$dir";

      File f = new File(file);

// convert rows to String and write as csv file

      String csv = const ListToCsvConverter().convert(employeeData);
      f.writeAsString(csv);
    }else{

      Map<Permission, PermissionStatus> statuses = await [
        Permission.storage,
      ].request();
    }
  }


  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text("Flutter CSV Upload"),
      ),
      body: SingleChildScrollView(
        child: Column(

          mainAxisAlignment: MainAxisAlignment.spaceBetween,

          children: <Widget>[
            ListView.builder(
              shrinkWrap: true,
              itemCount: employeeData.length,
                itemBuilder: (context,index){
              return Card(
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                     Text(employeeData[index][0]),
                     Text(employeeData[index][1]),
                     Text(employeeData[index][2]),
                    ],
                  ),
                ),
              );
            }),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Container(
                color: Colors.green,
                height: 30,
                child: TextButton(
                  child: Text("Export to CSV",style: TextStyle(color: Colors.white),),
                    onPressed: getCsv,
                ),
              ),
            ),

          ],
        ),
      ),

      // This trailing comma makes auto-formatting nicer for build methods.
    );

  }



}