flutter download an Image from url - flutter

Question

I'm trying to load image from server using networkimage() and I want to download the same once it is loaded.. can anyone suggest me some ideas.
CircleAvatar(
backgroundImage: NetworkImage(url),
maxRadius: 15.0,
);
Here I'm loading image from my server. I want to save to the image to particular path after the image is loaded.

Answer 1

I recently battled this, and decided to solve it without plugins. I hope it helps someone.
The below program downloads a picture from the web, stores it in the device's local path, and then displays it when run. (note, it does not work for flutter web because you don't have access to the local file storage on that platform. Instead you would have to save the image to a local database using a plugin like sqflite, or hive from pub.dev.) Here's the code:
import 'package:flutter/material.dart';
import 'package:http/http.dart' show get;
import 'dart:io';
import 'package:path_provider/path_provider.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Test Image',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Test Image'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
initState() {
_asyncMethod();
super.initState();
}
_asyncMethod() async {
//comment out the next two lines to prevent the device from getting
// the image from the web in order to prove that the picture is
// coming from the device instead of the web.
var url = "https://www.tottus.cl/static/img/productos/20104355_2.jpg"; // <-- 1
var response = await get(url); // <--2
var documentDirectory = await getApplicationDocumentsDirectory();
var firstPath = documentDirectory.path + "/images";
var filePathAndName = documentDirectory.path + '/images/pic.jpg';
//comment out the next three lines to prevent the image from being saved
//to the device to show that it's coming from the internet
await Directory(firstPath).create(recursive: true); // <-- 1
File file2 = new File(filePathAndName); // <-- 2
file2.writeAsBytesSync(response.bodyBytes); // <-- 3
setState(() {
imageData = filePathAndName;
dataLoaded = true;
});
}
String imageData;
bool dataLoaded = false;
#override
Widget build(BuildContext context) {
if (dataLoaded) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image.file(File(imageData), width: 600.0, height: 290.0)
],
),
),
);
} else {
return CircularProgressIndicator(
backgroundColor: Colors.cyan,
strokeWidth: 5,
);
}
}
}
pubspec.yaml file:
http: ^0.12.1
path_provider: ^1.6.5
flutter version: 1.20.0-3.0.pre.112
dart version 2.9.0-19.0.dev

Answer 2

I recommend image_downloader.
For ios, image is saved in Photo Library.
For Android, image is saved in Environment.DIRECTORY_DOWNLOADS or specified location. By calling inExternalFilesDir(), specification of permission becomes unnecessary.
By callback(), you can get progress status.
The following is the simplest example. It will be saved.
await ImageDownloader.downloadImage(url);

Answer 3

I used image_downloader.
Use await ImageDownloader.downloadImage("url") of image_downloader package's method to download image using it's url.
Note : above method will return value as follows :-
imageId of the saved image if saving succeeded.
null if not been granted permission.
for this you have to ask for storage permission, just add following line into android manifest file :
uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"
Otherwise it is a PlatformException.

Answer 4

I tried many solution, but this is simplest solution for my... Just try it
STEP - 1
Add this package in your pubspec.yaml file
dependencies:
image_downloader: ^0.20.1
STEP - 2
Add this in your dart file
import 'package:image_downloader/image_downloader.dart';
STEP - 3
Write this code on press download button
ColButton(
title: 'Download',
icon: Icons.file_download,
onTap: () async {
try {
showLoadingDialog(context);
// Saved with this method.
var imageId =
await ImageDownloader.downloadImage("https://raw.githubusercontent.com/wiki/ko2ic/image_downloader/images/bigsize.jpg");
if (imageId == null) {
return;
}
// Below is a method of obtaining saved image information.
var fileName = await ImageDownloader.findName(imageId);
var path = await ImageDownloader.findPath(imageId);
var size = await ImageDownloader.findByteSize(imageId);
var mimeType = await ImageDownloader.findMimeType(imageId);
Navigator.pop(context);
showToast('Image downloaded.');
} on PlatformException catch (error) {
print(error);
}
},
),

Answer 5

I use this plugin to save image in the phone using an URL
https://pub.dartlang.org/packages/image_picker_saver

Answer 6

For more advanced handling of Image/File downloads, you can consider the flutter_downloader package.
Some of the features that I like are :
Shows OS level download progress
can track all downloads
Has notification