Question

我想下载图像并使用dio和path_provider将其保存到唯一目录名称的存储中。但是我遇到了错误：

I/flutter (15977): FileSystemException: Cannot open file, 
path = '/data/user/0/com.manga.indonesia.manga.suka/app_flutter/sensei-wa-koi-o-oshie-rarenai-chapter-7-bahasa-indonesia/0.jpg'

如何创建此sensei-wa-koi-o-oshie-rarenai-chapter-7-bahasa-indonesia目录？

我的代码：

downloadChapter(chapter) async {
    Response res;
    Dio dio = new Dio();
    var dir = await getApplicationDocumentsDirectory();
    try {
      res = await dio
          .get('http://0.0.0.0:8080/api/MangaSuka/kchapters/' + chapter);

      var contentChapter = res.data['content'].where((a) {
        return a != null;
      }).toList();
      for (var i = 0; i < contentChapter.length; i++) {
        await dio.download(contentChapter[i], "${dir.path}/${chapter}/$i.jpg",
            onProgress: (rec, total) {
          print("Rec: $rec , Total: $total");
        });
      };
      return print(contentChapter);
    } catch (e) {
      return print(e);
    }
  }

Answer 1

在flutter documentation中有很好的解释：

import 'dart:io';

void main() {
  new Directory('sensei-wa-koi-o-oshie-rarenai-chapter-7-bahasa-indonesia').create()
    // The created directory is returned as a Future.
    .then((Directory directory) {
      print(directory.path);
  });
}

Answer 2

import 'package:path_provider_ex/path_provider_ex.dart';
import 'dart:io';
import 'package:simple_permissions/simple_permissions.dart';
//packages
//  simple_permissions: ^0.1.9
//  path_provider_ex:
//Android mainfest 
//  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 //   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
main(){
  List<StorageInfo> _storageInfo = [];

  @override
  void initState() {
    super.initState();
    initPlatformState();
    Timer(Duration(seconds: 2), () {
      createFolder();
    });
  }
  createFolder() async {
    PermissionStatus permissionResult =
        await SimplePermissions.requestPermission(
            Permission.WriteExternalStorage);
    if (permissionResult == PermissionStatus.authorized) {
    //   Directory _appFile = Directory(_storageInfo[0].rootDir + '/MyTestFOlder');
    // _appFile.create();
     new Directory(_storageInfo[0].rootDir + '/MyCreatedFolder').create()
    // The created directory is returned as a Future.
    .then((Directory directory) {
      print(directory.path);
  });
      // File ourTempFile = File(_appFile.path);
      // print(ourTempFile.path);
     // ourTempFile.create();
      // code of read or write file in external storage (SD card)
    }
  }
}

如何在flutter中创建目录

2 个答案: