How to download with image url to device in Flutter

In this Google flutter code example we are going to learn how to download with image url to device in Flutter.

The code is based on flutter version 1.0.0

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'download_image_task-7.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: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      //home: MyHomePage(title: 'Flutter Demo Home Page'),
      home: DownloadImage(),
    );
  }
}

download_image_task-7.dart

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';

class DownloadImage extends StatefulWidget {
  _DownloadImageState createState() => _DownloadImageState();
}

class _DownloadImageState extends State<DownloadImage> {
  TextEditingController _controller = TextEditingController(
      text: "https://m.africoders.com/media/users/default.png");
  var imgUrl = "https://m.africoders.com/media/users/default.png";

  var progress = "";
  bool downloading = false;

  Future<void> _download() async {
    Dio dio = Dio();

    var dirToSave = await getApplicationDocumentsDirectory();

    await dio.download(_controller.text, "${dirToSave.path}/myImage.jpg",
        onReceiveProgress: (rec, total) {
      setState(() {
        downloading = true;
        progress = ((rec / total) * 100).toStringAsFixed(0) + "%";
      });
    });

    try {} catch (e) {
      throw e;
    }
    setState(() {
      downloading = false;
      progress = "Complete";
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: Text('Download Image Example'),
      ),
      body: Center(
        child: Column(
          children: <Widget>[
            downloading ? CircularProgressIndicator() : SizedBox(),
            SizedBox(height: 10),
            downloading ? Text(progress) : SizedBox(),
            SizedBox(height: 15),
            Padding(
              padding: const EdgeInsets.all(18.0),
              child: TextField(
                controller: _controller,
                decoration: InputDecoration(
                  hintText: 'Enter image URL',
                ),
              ),
            ),
            SizedBox(height: 30),
            RaisedButton(
              child: Text('Download'),
              onPressed: _download,
              color: Colors.red,
            ),
          ],
        ),
      ),
    );
  }
}

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