[英]How can I download file using flutter dio?
I want to downlaod file using url with help of flutter Dio
.我想在 flutter
Dio
帮助下使用 url 下载文件。
final imgUrl = "https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf";
var dio = Dio();
RaisedButton.icon(
onPressed: (){
download2(dio, imgUrl, "./example/boo2.pdf");
},
icon: Icon(Icons.file_download,color: Colors.white,),
color: Colors.green,
textColor: Colors.white,
label: Text('Dowload Invoice')
)
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) + "%");
}
}
i am gettng this error.我得到这个错误。
OS Error: Permission denied, errno = 13flutter操作系统错误:权限被拒绝,errno = 13flutter
You can copy paste run full code below您可以在下面复制粘贴运行完整代码
You need to use https://pub.dev/packages/path_provider to get Temporary Directory您需要使用https://pub.dev/packages/path_provider来获取临时目录
code snippet代码片段
RaisedButton.icon(
onPressed: () async {
var tempDir = await getTemporaryDirectory();
String fullPath = tempDir.path + "/boo2.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 Invoice'))
working demo工作演示
full code完整代码
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';
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++;
});
}
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 {
var tempDir = await getTemporaryDirectory();
String fullPath = tempDir.path + "/boo2.pdf'";
print('full path ${fullPath}');
download2(dio, imgUrl, fullPath);
},
icon: Icon(
Icons.file_download,
color: Colors.white,
),
color: Colors.green,
textColor: Colors.white,
label: Text('Dowload Invoice')),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
You have to add permissions.您必须添加权限。
For Android: in AndroidManifest.xml对于 Android:在 AndroidManifest.xml 中
<manifest... <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.INTERNET"/>
pubspec.yaml pubspec.yaml
ext_storage: ^1.0.3
ext_storage: ^1.0.3
your.dart你的飞镖
@override void initState() { getPermission(); super.initState(); } //get storage permission void getPermission() async { await PermissionHandler().requestPermissions([PermissionGroup.storage]); }
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