Open pdf

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:open_file/open_file.dart';
import 'package:path_provider/path_provider.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(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          child: Text('download'),
          onPressed: _doDownload,
        ),
      ),
    );
  }

  void _doDownload() async {
    // String _url =
    //     "https://file-examples-com.github.io/uploads/2017/10/file-example_PDF_1MB.pdf";
    // await canLaunch(_url) ? await launch(_url) : throw 'Could not launch $_url';
    String path = '';

    Directory dir = await getApplicationDocumentsDirectory();

    path = '${dir.path}/test.pdf';

    Dio dio = Dio();
    dio.download(
      'https://file-examples-com.github.io/uploads/2017/10/file-example_PDF_1MB.pdf',
      path,
      onReceiveProgress: (rcv, total) {
        print(
            'received: ${rcv.toStringAsFixed(0)} out of total: ${total.toStringAsFixed(0)}');
      },
      deleteOnError: true,
    ).then((_) {
      OpenFile.open(path);
    });
  }
}