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
https://stackoverflow.com/questions/53580719
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