Flutter 如何在flatter中创建目录
我想下载图像并使用dio和path_provider将其保存到一个唯一的目录名中。但我有一个错误:Flutter 如何在flatter中创建目录,flutter,Flutter,我想下载图像并使用dio和path_provider将其保存到一个唯一的目录名中。但我有一个错误: 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' 我怎样才能制作这个唤醒-
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'
我怎样才能制作这个唤醒-wa-koi-o-oshie-rarenai-chapter-7-bahasa-indonesia
目录
我的代码:
下载章节(章节)异步{
反应物;
Dio Dio=新的Dio();
var dir=等待getApplicationDocumentsDirectory();
试一试{
res=等待dio
.get('http://0.0.0.0:8080/api/MangaSuka/kchapters/"(第1章),;
var contentChapter=res.data['content'],其中((a){
返回一个!=null;
}).toList();
for(var i=0;i
以下章节对此进行了详细说明:
但是,在许多情况下,例如创建一个目录,directory.create的异步(默认)版本可能不会节省时间,并且可能会导致争用情况。在这种情况下,使用命令的同步版本更合适:
new Directory('sensei-wa-koi-o-oshie-rarenai-chapter-7-bahasa-indonesia').createSync()
// ... following sequential code
值得注意的是,许多dart::io方法都有*同步版本。import'package:path\u provider\u ex/path\u provider\u ex.dart';
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)
}
}
}
导入“dart:io”;
导入“package:simple_permissions/simple_permissions.dart”;
//包裹
//简单权限:^0.1.9
//路径\提供者\示例:
//安卓mainfest
//
//
main(){
列表_storageInfo=[];
@凌驾
void initState(){
super.initState();
initPlatformState();
计时器(持续时间(秒数:2),(){
createFolder();
});
}
createFolder()异步{
许可状态许可结果=
等待SimplePermissions.requestPermission(
权限。WriteExternalStorage);
if(permissionResult==PermissionStatus.authorized){
//目录_appFile=Directory(_storageInfo[0].rootDir+'/MyTestFOlder');
//_appFile.create();
新目录(_storageInfo[0].rootDir+'/MyCreatedFolder')。create()
//创建的目录将作为将来的目录返回。
.then((目录){
打印(directory.path);
});
//File ourTempFile=File(_appFile.path);
//打印(ourTempFile.path);
//创建();
//外部存储器(SD卡)中读取或写入文件的代码
}
}
}
虽然此代码可以回答问题,但提供有关如何和/或为什么解决问题的附加上下文将提高答案的长期价值。
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)
}
}
}