how to load file from online in flutter - flutter

Question

I'm able to load file from my code. But the problem is, how to load the file from online server which is from this link- https://freevpn.gg/c/59.139.187.41/udp
My current code is-
var contennt=await rootBundle.loadString('assets/vpnconfig.ovpn');

Answer 1

You could use flutter cache manager to download the file and then read it. https://pub.dev/packages/flutter_cache_manager
String url = 'your_link';
final file = await DefaultCacheManager().getSingleFile(url);
var content = await file.readAsString();

Answer 2

dependencies:
flutter_filereader: ^2.2.0
import 'dart:convert';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_filereader_example/file.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
void initState() {
Permission.storage.request();
super.initState();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
String taskId;
Map<String, String> iosfiles = {
"docx": "assets/files/docx.docx", // IOS test
"doc": "assets/files/doc.doc", // IOS test
"xlsx": "assets/files/xlsx.xlsx", // IOS test
"xls": "assets/files/xls.xls", // IOS test
"pptx": "assets/files/pptx.pptx", // IOS test
"ppt": "assets/files/ppt.ppt", // IOS test
"pdf": "assets/files/pdf.pdf", // IOS test
"txt": "assets/files/txt.txt", // IOS test
"jpg": "assets/files/jpg.jpg", //
"jpeg": "assets/files/jpeg1.jpeg", //
"png": "assets/files/png.png", //
};
Map<String, String> androidfiles = {
"docx": "assets/files/docx.docx", // android test
"doc": "assets/files/doc.doc", // android test
"xlsx": "assets/files/xlsx.xlsx", // android test
"xls": "assets/files/xls.xls", // android test
"pptx": "assets/files/pptx.pptx", // android test
"ppt": "assets/files/ppt.ppt", // android test
"pdf": "assets/files/pdf.pdf", // android test
"txt": "assets/files/txt.txt" // android test
};
Map<String, String> files;
#override
void initState() {
if (Platform.isAndroid) {
files = androidfiles;
} else {
files = iosfiles;
}
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('File Reader'),
),
body: ListView.builder(
itemBuilder: (ctx, index) {
return item(files.keys.elementAt(index), files.values.elementAt(index));
},
itemCount: files.length,
),
);
}
item(String type, String path) {
return GestureDetector(
onTap: () {
onTap(type, path);
},
child: Container(
alignment: Alignment.center,
height: 50,
margin: EdgeInsetsDirectional.only(bottom: 5),
color: Colors.blue,
child: Center(
child: Text(
type,
style: TextStyle(color: Colors.white, fontSize: 20),
),
),
),
);
}
onTap(String type, String assetPath) async {
String localPath = await fileLocalName(type, assetPath);
if (!await File(localPath).exists()) {
if (!await asset2Local(type, assetPath)) {
return;
}
}
Navigator.of(context).push(MaterialPageRoute(builder: (ctx) {
return FileReaderPage(
filePath: localPath,
);
}));
}
fileLocalName(String type, String assetPath) async {
String dic = await _localSavedDir() + "/filereader/files/";
return dic + base64.encode(utf8.encode(assetPath)) + "." + type;
}
fileExists(String type, String assetPath) async {
String fileName = await fileLocalName(type, assetPath);
if (await File(fileName).exists()) {
return true;
}
return false;
}
asset2Local(String type, String assetPath) async {
if (Platform.isAndroid) {
if (!await Permission.storage.isGranted) {
debugPrint("没有存储权限");
return false;
}
}
File file = File(await fileLocalName(type, assetPath));
if (await fileExists(type, assetPath)) {
await file.delete();
}
await file.create(recursive: true);
//await file.create();
debugPrint("文件路径->" + file.path);
ByteData bd = await rootBundle.load(assetPath);
await file.writeAsBytes(bd.buffer.asUint8List(), flush: true);
return true;
}
_localSavedDir() async {
Directory dic;
if (defaultTargetPlatform == TargetPlatform.android) {
dic = await getExternalStorageDirectory();
} else if (defaultTargetPlatform == TargetPlatform.iOS) {
dic = await getApplicationDocumentsDirectory();
}
return dic.path;
}
}