在flutter中下载文件
在flutter中下载文件
提问于 2018-12-02 21:30:16
我做了一个flutter应用程序，首先我显示所有关于pdf文件的信息，它包括文件的url，通信形式Restfull API，一切正常，但我想下载这个文件时，用户点击它，我尝试：
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.dataindex.file，path是来自api的正确路径或文件，但它不工作，并在此代码中给我一个(路径)错误
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)有没有其他下载文件的方法？或者只是打开它？非常感谢
回答 2
Stack Overflow用户
发布于 2019-07-17 03:30:47
以防其他人需要这个。
问题是您没有将文件路径作为参数传递，而是传递了一个目录。
await dio.download(snapshot.data[index].file, path+'/fileName.pdf'); 这应该可以解决问题。
Stack Overflow用户
发布于 2021-06-13 18:17:12
在flutter https://pub.dev/packages/file_support上使用插件文件支持
Future<File> downloadFile async{
File file =await FileSupport(url:"http://test.com/.mp4");
return file;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/53580719
复制相关文章
相似问题