我已经搜索了这个问题的类似问题和答案,但到目前为止还没有找到任何具体的答案。我正在尝试将下载的文件保存到我的内部手机存储中。最好是下载文件夹...我正在使用 dio 和路径提供程序。尝试使用“获取外部存储目录”。但即使在下载之后,我也无法在设备中的任何位置找到该文件。请我如何指定下载路径到 /storage/emulated/0/Download
问问题
13990 次
2 回答
10
您可以在下面复制粘贴运行完整代码
此示例代码下载pdf
文件Dio
并保存到Downloads
目录
第1步:downloads_path_provider
已由所有者存档,您可以使用包https://pub.dev/packages/ext_storage
代码片段
String path = await ExtStorage.getExternalStoragePublicDirectory(
ExtStorage.DIRECTORY_DOWNLOADS);
print(path);
第二步:添加权限AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
步骤 3:pubspec.yaml
,通知permission_handler
是4.4.0
dependencies:
flutter:
sdk: flutter
dio: any
permission_handler: 4.4.0
ext_storage: any
第四步:Dio
下载文件
Future download2(Dio dio, String url, String savePath) async {
try {
Response response = await dio.get(
url,
onReceiveProgress: showDownloadProgress,
//Received data with List<int>
options: Options(
responseType: ResponseType.bytes,
followRedirects: false,
validateStatus: (status) {
return status < 500;
}),
);
print(response.headers);
File file = File(savePath);
var raf = file.openSync(mode: FileMode.write);
// response.data is List<int> type
raf.writeFromSync(response.data);
await raf.close();
} catch (e) {
print(e);
}
}
输出
I/flutter (13605): full path /storage/emulated/0/Download/test.pdf
I/flutter (13605): 62%
I/flutter (13605): 100%
完整代码
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:ext_storage/ext_storage.dart';
import 'dart:io';
import 'package:permission_handler/permission_handler.dart';
final imgUrl =
"https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf";
var dio = Dio();
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
void getPermission() async {
print("getPermission");
Map<PermissionGroup, PermissionStatus> permissions =
await PermissionHandler().requestPermissions([PermissionGroup.storage]);
}
@override
void initState() {
getPermission();
super.initState();
}
Future download2(Dio dio, String url, String savePath) async {
try {
Response response = await dio.get(
url,
onReceiveProgress: showDownloadProgress,
//Received data with List<int>
options: Options(
responseType: ResponseType.bytes,
followRedirects: false,
validateStatus: (status) {
return status < 500;
}),
);
print(response.headers);
File file = File(savePath);
var raf = file.openSync(mode: FileMode.write);
// response.data is List<int> type
raf.writeFromSync(response.data);
await raf.close();
} catch (e) {
print(e);
}
}
void showDownloadProgress(received, total) {
if (total != -1) {
print((received / total * 100).toStringAsFixed(0) + "%");
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton.icon(
onPressed: () async {
String path =
await ExtStorage.getExternalStoragePublicDirectory(
ExtStorage.DIRECTORY_DOWNLOADS);
//String fullPath = tempDir.path + "/boo2.pdf'";
String fullPath = "$path/test.pdf";
print('full path ${fullPath}');
download2(dio, imgUrl, fullPath);
},
icon: Icon(
Icons.file_download,
color: Colors.white,
),
color: Colors.green,
textColor: Colors.white,
label: Text('Dowload')),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
于 2020-05-07T06:43:36.860 回答
0
我没有测试过,但是如果你想将下载的文件保存到下载目录,有一个包:downloads_path_provider
如果遇到问题,可以改用path_provider包。它使您可以访问多个设备目录。
于 2020-05-06T22:01:23.593 回答