download file in flutter

Question

i make a flutter application, first i display all information about pdf file, and it is include the url of the file, comming form Restfull API, everything work good, but i want to download this file when user click on it, i try this:

 onTap: () async {
                                // downloadFile(snapshot.data[index].file);
                                Dio dio = new Dio();
                                Directory dir =
                                    await getApplicationDocumentsDirectory();
                                String path = dir.path;
                                await dio.download(
                                    snapshot.data[index].file, path);
                              },

snapshot.data[index].file, path is the right path or file that come from api, but it is not work, and give me an error with (path) in this code

await getApplicationDocumentsDirectory();
String path = dir.path;

this is my error log:

E/flutter (26482): [ERROR:flutter/shell/common/shell.cc(188)] Dart Error: Unhandled exception:
E/flutter (26482): FileSystemException: Cannot open file, path = '/data/data/com.example.mis/app_flutter' (OS Error: Is a
directory, errno = 21)
E/flutter (26482): #0      _File.throwIfError (dart:io/file_impl.dart:647:7)
E/flutter (26482): #1      _File.openSync (dart:io/file_impl.dart:491:5)
E/flutter (26482): #2      Dio.download (package:dio/src/dio.dart:212:20)
E/flutter (26482): <asynchronous suspension>
E/flutter (26482): #3      MaterialsState.build.<anonymous closure>.<anonymous closure>.<anonymous closure>
(package:mis/courses/materials.dart:121:47)
E/flutter (26482): <asynchronous suspension>
E/flutter (26482): #4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
E/flutter (26482): #5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
E/flutter (26482): #6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (26482): #7      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
E/flutter (26482): #8      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:204:7)
E/flutter (26482): #9      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (26482): #10     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent
(package:flutter/src/gestures/binding.dart:184:20)
E/flutter (26482): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent
(package:flutter/src/gestures/binding.dart:158:22)
E/flutter (26482): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent
(package:flutter/src/gestures/binding.dart:138:7)
E/flutter (26482): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue
(package:flutter/src/gestures/binding.dart:101:7)
E/flutter (26482): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket
(package:flutter/src/gestures/binding.dart:85:7)
E/flutter (26482): #15     _invoke1 (dart:ui/hooks.dart:159:13)
E/flutter (26482): #16     _dispatchPointerDataPacket (dart:ui/hooks.dart:113:5)

is there any other method to download file? or even to just open it? thank you very much

Please post the error log. Yes, there is another method where you can use [flutter_downloader] plugin specifically designed for creating and managing download tasks. Supports iOS and Android. pub.dartlang.org/packages/flutter_downloader — a0x2, Commented Dec 2, 2018 at 14:44

nonybrighto · Accepted Answer · 2019-07-16 19:30:47Z

7

Just in case anyone else needs this.
The problem is that you didn't pass a file path as parameter but passed a directory.

await dio.download(snapshot.data[index].file, path+'/fileName.pdf');

That should solve the issue.

answered Jul 16, 2019 at 19:30

nonybrighto

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Parmeet Singh · Accepted Answer · 2021-06-13 10:17:12Z

1

Use plugin File support on flutter https://pub.dev/packages/file_support

Future<File> downloadFile async{
File file =await FileSupport(url:"http://test.com/.mp4");
 return file;
}

answered Jun 13, 2021 at 10:17

Parmeet Singh

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Ahmed El Rhaouti · Accepted Answer · 2022-08-18 17:43:57Z

0

You can use this package flutter cache manager

using this code to get your file:

 String url = 'https://fileUrl';
File file = await DefaultCacheManager().getSingleFile(url);

then you can use 'file' to do what you want.

answered Aug 18, 2022 at 17:43

Ahmed El Rhaouti

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