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How to Create a Download Button in Flutter?



Apps are brimming with buttons that carry out long-running actions. A button, for example, could initiate a download, which initiates the download process, receives data over time, and ultimately grants access to the downloaded content.

It’s useful to provide the user with the details of how a long-running procedure is progressing, and the button is a suitable spot to do so. This recipe will show you how to make a download button that changes visual states depending on the status of an app download. If you are having trouble implementing the solution, gets talented Flutter developers for hire from our company. Our developers are also experts in creating high-end mobile applications.

The steps involved in the process of creating a download button in the flutter development app are mentioned below:

Defining a new Stateful widget
Defining the possible visual states of the button
Display the shape of the button
Creating the display of the button’s text
Display a spinner while fetching the download
Display the progress percentage and a stop button while downloading
Add callbacks to button taps


1. Defining a new stateful widget


The appearance of your button widget must alter over time. As a result, you’ll need to use a bespoke stateless widget to implement your button. Then, define a new stateless widget called DownloadButton.
class DownloadButton extends StatelessWidget {
const DownloadButton({
super.key,
});
Widget build(BuildContext context) {
// TODO:
return const SizedBox();
}
}


2. Defining the possible visual states of the button


The current download status determines the visual display of the download button. After Defining the download’s possible states, update DownloadButton to accept a DownloadStatus and specify the duration for how long the button should fly from one visual state to the next.

When designing a custom widget, you must select whether it receives all necessary information from its parent or if the Widget orchestrates the application’s activity internally. DownloadButton, for example, might get the existing DownloadStatus from its parent, or it may coordinate the download process within its State object.

Rather than managing behavior within the Widget, the ideal solution for most widgets is to transfer relevant information into it from its parent. You assure increased utility for the Widget, simpler testing, and future modifications to application behavior by handing in all essential information.
enum DownloadStatus {
notDownloaded,
fetchingDownload,
downloading,
downloaded,
}


3. Display the shape of the button

The form of the download button varies depending on the download state. During the notDownloaded and downloaded phases, the button shows a gray, rounded rectangle. During the fetchingDownload and downloading stages, the button shows a translucent circle.

In the next step, Create an AnimatedContainer with a ShapeDecoration that shows a rounded rectangle or a circle based on the current DownloadStatus.

Consider establishing the shape’s widget tree in a separate Stateless widget to keep the main construct() function simple while allowing for the modifications that will come later. Then, rather than constructing a function to return a widget, such as Widget _buildSomething(), always create a StatelessWidget or a StatefulWidget, which is faster.

Now, the AnimatedContainer appears to be just a SizedBox child, but you don’t need to worry; we will resolve this state in another step.
classButtonShapeWidget extends StatelessWidget {
constButtonShapeWidget({
super.key,
requiredthis.isDownloading,
requiredthis.isDownloaded,
requiredthis.isFetching,
requiredthis.transitionDuration,
});
final bool isDownloading;
final bool isDownloaded;
final bool isFetching;
final Duration transitionDuration;
Widget build(BuildContext context) {
var shape = constShapeDecoration(
shape: StadiumBorder(),
color: CupertinoColors.lightBackgroundGray,
);

if (isDownloading || isFetching) {
shape = ShapeDecoration(
shape: constCircleBorder(),
color: Colors.white.withOpacity(0.0),
);
}
return AnimatedContainer(
duration: transitionDuration,
curve: Curves.ease,
width: double.infinity,
decoration: shape,
child: constSizedBox(),
);
}
}


4. Creating the display of the button’s text


Different messages are displayed through the Download button in its different phases. The notDownloaded phase displays the GET option. The downloaded phases display the OPEN option for the users, while no text is displayed in the intermediate process.

Add widgets to show text throughout each download step, and animate the opacity of the text between them. For example, in the button wrapper widget, make the text widget tree a child of the AnimatedContainer.
return AnimatedContainer(
duration: transitionDuration,
curve: Curves.ease,
width: double.infinity,
decoration: shape,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 6),
child: AnimatedOpacity(
duration: transitionDuration,
opacity: isDownloading || isFetching ? 0.0 : 1.0,
curve: Curves.ease,
child: Text(
isDownloaded ?'OPEN' : 'GET',
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.button?.copyWith(
fontWeight: FontWeight.bold,
color: CupertinoColors.activBlue,
),
),
),
),
);


5. Display a spinner while fetching the download

The DownloadButton shows a radial spinner while fetchingDownload is in progress. This spinner transitions from notDownloaded to fetchingDownload.
Install a radial spinner on top of the button form that fades in and out at appropriate intervals.
The function Object() { [native code] } of the ButtonShapeWidget has been eliminated to focus on its build function and the Stack widget that we’ve created.
Widget build(BuildContext context) {
return GestureDetector(
onTap: _onPressed,
child: Stack(
children: [
ButtonShapeWidget(
transitionDuration: transitionDuration,
isDownloaded: _isDownloaded,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
Positioned.fill(
child: AnimatedOpacity(
duration: transitionDuration,
opacity: _isDownloading || _isFetching ? 1.0 : 0.0,
curve: Curves.ease,
child: ProgressIndicatorWidget(
downloadProgress: downloadProgress,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
),
),
],
),
);
}


6. Display the progress percentage and a stop button while downloading


Following the retrieval, the downloading step is exactly that. The DownloadButton transforms the radial progress spinner with a rising radial progress bar during the downloading period. A stop button symbol is also displayed on the DownloadButton, allowing the user to halt an ongoing download.

After adding an advancement property to the DownloadButton plugin, change the progress display to a radial toolbar during the downloading phase. Then, place a stop button icon in the center of the radial progress bar.
Widget build(BuildContext context) {
return GestureDetector(
onTap: _onPressed,
child: Stack(
children: [
ButtonShapeWidget(
transitionDuration: transitionDuration,
isDownloaded: _isDownloaded,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
Positioned.fill(
child: AnimatedOpacity(
duration: transitionDuration,
opacity: _isDownloading || _isFetching ? 1.0 : 0.0,
curve: Curves.ease,
child: Stack(
alignment: Alignment.center,
children: [
ProgressIndicatorWidget(
downloadProgress: downloadProgress,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
if (_isDownloading)
const Icon(
Icons.stop,
size: 14.0,
color: CupertinoColors.activeBlue,
),
],
),
),
),
],
),
);
}


7. Add callbacks to button taps


The button behavior is the final thing that your DownloadButton requires. When the user clicks the button, it must do some action. Add callbacks for starting a download, canceling a download, and opening a download to the widget properties.
Finally, use a GestureDetector widget to cover DownloadButton’s current widget tree and route the tap event to the relevant callback property.
void _onPressed() {
switch (status) {
case DownloadStatus.notDownloaded:
onDownload();
break;
case DownloadStatus.fetchingDownload:
// do nothing.
break;
case DownloadStatus.downloading:
onCancel();
break;
case DownloadStatus.downloaded:
onOpen();
break;
}
}
Now at the end of the process, you have a button that displays different information based on whatever phase it is in: not downloaded, seeking download, downloading phase, and downloaded completely. The user may tap to initiate a download, stop an ongoing download, and access a finished download by tapping.

Let’s see a full example of DownloadButton:
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
runApp(
const MaterialApp(
home: ExampleDownloadButton(),
debugShowCheckedModeBanner: false,
),
);
}
class ExampleDownloadButton extends StatefulWidget {
const ExampleDownloadButton();
_ExampleDownloadButtonState createState() => _ExampleDownloadButtonState();
}
class _ExampleDownloadButtonState extends State<exampledownloadbutton> {
late final List<downloadcontroller> _downloadControllers;
void initState() {
super.initState();
_downloadControllers = List<downloadcontroller>.generate(
10,
(index) => SimulatedDownloadController(onOpenDownload: () {
_openDownload(index);
}),
);
}
void _openDownload(int index) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Open PDF ${index + 1}'),
),
);
}
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Download Button')),
body: ListView.separated(
itemCount: _downloadControllers.length,
separatorBuilder: (_, __) => const Divider(),
itemBuilder: _buildListItem,
),
);
}
Widget _buildListItem(BuildContext context, int index) {
final theme = Theme.of(context);
final downloadController = _downloadControllers[index];
return ListTile(
leading: const Icon(Icons.list_rounded),
title: Text(
'Pdf ${index + 1}',
overflow: TextOverflow.ellipsis,
style: theme.textTheme.headline6,
),
trailing: SizedBox(
width: 96,
child: AnimatedBuilder(
animation: downloadController,
builder: (context, child) {
return DownloadButton(
status: downloadController.downloadStatus,
downloadProgress: downloadController.progress,
onDownload: downloadController.startDownload,
onCancel: downloadController.stopDownload,
onOpen: downloadController.openDownload,
);
},
),
),
);
}
}

enum DownloadStatus {
notDownloaded,
fetchingDownload,
downloading,
downloaded,
}

abstract class DownloadController implements ChangeNotifier {
DownloadStatus get downloadStatus;
double get progress;

void startDownload();
void stopDownload();
void openDownload();
}

class SimulatedDownloadController extends DownloadController
with ChangeNotifier {
SimulatedDownloadController({
DownloadStatus downloadStatus = DownloadStatus.notDownloaded,
double progress = 0.0,
required VoidCallback onOpenDownload,
}) : _downloadStatus = downloadStatus,
_progress = progress,
_onOpenDownload = onOpenDownload;

DownloadStatus _downloadStatus;
DownloadStatus get downloadStatus => _downloadStatus;

double _progress;
double get progress => _progress;

final VoidCallback _onOpenDownload;

bool _isDownloading = false;

void startDownload() {
if (downloadStatus == DownloadStatus.notDownloaded) {
_doSimulatedDownload();
}
}

void stopDownload() {
if (_isDownloading) {
_isDownloading = false;
_downloadStatus = DownloadStatus.notDownloaded;
_progress = 0.0;
notifyListeners();
}
}

void openDownload() {
if (downloadStatus == DownloadStatus.downloaded) {
_onOpenDownload();
}
}

Future<void> _doSimulatedDownload() async {
_isDownloading = true;
_downloadStatus = DownloadStatus.fetchingDownload;
notifyListeners();

// Wait a second to simulate fetch time.
await Future<void>.delayed(const Duration(seconds: 1));

// If the user chose to cancel the download, stop the simulation.
if (!_isDownloading) {
return;
}

// Shift to the downloading phase.
_downloadStatus = DownloadStatus.downloading;
notifyListeners();

const downloadProgressStops = [0.0, 0.15, 0.45, 0.8, 1.0];
for (final stop in downloadProgressStops) {
// Wait a second to simulate varying download speeds.
// await Future<void>.delayed(const Duration(seconds: 1));

if (!_isDownloading) {
return;
}

_progress = stop;
notifyListeners();
}
await Future<void>.delayed(const Duration(seconds: 1));

if (!_isDownloading) {
return;
}

_downloadStatus = DownloadStatus.downloaded;
_isDownloading = false;
notifyListeners();
}
}

class DownloadButton extends StatelessWidget {
const DownloadButton({
required this.status,
this.downloadProgress = 0.0,
required this.onDownload,
required this.onCancel,
required this.onOpen,
this.transitionDuration = const Duration(milliseconds: 500),
});

final DownloadStatus status;
final double downloadProgress;
final VoidCallback onDownload;
final VoidCallback onCancel;
final VoidCallback onOpen;
final Duration transitionDuration;

bool get _isDownloading => status == DownloadStatus.downloading;
bool get _isFetching => status == DownloadStatus.fetchingDownload;
bool get _isDownloaded => status == DownloadStatus.downloaded;

void _onPressed() {
switch (status) {
case DownloadStatus.notDownloaded:
onDownload();
break;
case DownloadStatus.fetchingDownload:
// do nothing.
break;
case DownloadStatus.downloading:
onCancel();
break;
case DownloadStatus.downloaded:
onOpen();
break;
}
}

Widget build(BuildContext context) {
return GestureDetector(
onTap: _onPressed,
child: Stack(
children: [
ButtonShapeWidget(
transitionDuration: transitionDuration,
isDownloaded: _isDownloaded,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
Positioned.fill(
child: AnimatedOpacity(
duration: transitionDuration,
opacity: _isDownloading || _isFetching ? 1.0 : 0.0,
curve: Curves.ease,
child: Stack(
alignment: Alignment.center,
children: [
ProgressIndicatorWidget(
downloadProgress: downloadProgress,
isDownloading: _isDownloading,
isFetching: _isFetching,
),
if (_isDownloading)
const Icon(
Icons.stop,
size: 14,
color: CupertinoColors.activeBlue,
),
],
),
),
),
],
),
);
}
}
class ButtonShapeWidget extends StatelessWidget {
const ButtonShapeWidget({
key,
required this.isDownloading,
required this.isDownloaded,
required this.isFetching,
required this.transitionDuration,
});
final bool isDownloading;
final bool isDownloaded;
final bool isFetching;
final Duration transitionDuration;
Widget build(BuildContext context) {
var shape = const ShapeDecoration(
shape: StadiumBorder(),
color: CupertinoColors.lightBackgroundGray,
);
if (isDownloading || isFetching) {
shape = ShapeDecoration(
shape: const CircleBorder(),
color: Colors.white.withOpacity(0),
);
}
return AnimatedContainer(
duration: transitionDuration,
curve: Curves.ease,
width: double.infinity,
decoration: shape,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 6),
child: AnimatedOpacity(
duration: transitionDuration,
opacity: isDownloading || isFetching ? 0.0 : 1.0,
curve: Curves.ease,
child: Text(
isDownloaded ? 'OPEN' : 'GET',
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.button?.copyWith(
fontWeight: FontWeight.bold,
color: CupertinoColors.activeBlue,
),
),
),
),
);
}
}
class ProgressIndicatorWidget extends StatelessWidget {
const ProgressIndicatorWidget({
key,
required this.downloadProgress,
required this.isDownloading,
required this.isFetching,
});
final double downloadProgress;
final bool isDownloading;
final bool isFetching;
Widget build(BuildContext context) {
return AspectRatio(
aspectRatio: 1,
child: TweenAnimationBuilder<double>(
tween: Tween(begin: 0, end: downloadProgress),
duration: const Duration(milliseconds: 200),
builder: (context, progress, child) {
return CircularProgressIndicator(
backgroundColor: isDownloading
? CupertinoColors.lightBackgroundGray
: Colors.white.withOpacity(0),
valueColor: AlwaysStoppedAnimation(isFetching
? CupertinoColors.lightBackgroundGray
: CupertinoColors.activeBlue),
strokeWidth: 2,
value: isFetching ? null : progress,
);
},
),
);
}
}</double></void></void></void></void></downloadcontroller></downloadcontroller></exampledownloadbutton>


Output




Conclusion

So far, we learned How to create download button in Flutter. We have seen the 7 step process to create a download button. Thank you for Reading the article. Hope you enjoying our content. Keep visiting Flutter Agency for Flutter business app development solutions.

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Growcify is compatible: is compatible with the devices and software you're using. You can use it on your computer, laptop Growcify, smartphone, or tablet. 7. Growcify is regularly updated: Growcify is regularly updated with new features and bug fixes. This ensures that you're always using the latest and greatest version of the app. 8. Growcify has great reviews: If you're still not sure about Growcify, take some time to read the reviews from other users. This can give you a good idea of what to expect from the app. 9. Growcify Set up within 24 hours: Growcify's team will set your eCommerce business with the app within 24 hours. This is a great way to get started quickly and see how Growcify can help your business. 10. Growcify is always improving with constantly updating new features: The Growcify team is constantly working on new features and improvements. This ensures that you're always using the best possible version of the app and get all the relevant functionalities in the market. Why Growcify? Growcify is a SaaS platform that helps businesses with quick and easy eCommerce setup within 24 hours. It supports interface elements, custom features, friendly UI themes, and ePOS with a complete no-code solution. This eCommerce website and app development platform is easy-to-access and user-friendly, and you can also get access to unlimited features in minutes. Growcify makes your business grow online along with the same functions and functionalities of other platforms. On the other hand, it helps you scale your growth and revenue. Also manage customers, subscriptions, inventory, orders, and shipments without extra charges or effort. If you're looking for an online eCommerce business app that offers everything you need to run your eCommerce business effectively, then you need Growcify. It's easy to use, feature-rich, affordable, and comes with great customer support. Setup only takes 24 hours, so you can get started quickly and see how Growcify can help your business grow. Try Growcify.com today and see the difference it can make for your business.
How to Get Parameter Value from Query String in React?
Query strings are widely used to retrieve information from the URL of pages. Then, it can be accessed for further functioning web application functionalities and is a part of the URL or full query. It allows sending information using parameters as the key-value pairs. In other words, a query string is a piece of information sent to the server appended to the end of the page URL. A query string is a way to transfer information from one page to another via a URL. The query string is often attached to the URL with “?”. It is easy to use and does not require any server resources. Almost all browsers support Query String. You do not need to put extra effort into code. Are you stuck on how to get parameter values from Query String? If yes, then read this blog thoroughly. Or Need technical support in React development? Hire ReactJS developers from Bosc Tech Labs who have enriched experience developing complex applications. Ways to get parameter value from the query string Here are the three methods to follow to get parameter values from the query string. 1. You can use a regular expression to get the query string. import React from "react"; import { useLocation } from "react-router-dom"; const MyComponent = () => { const { language } = useLocation(); const name = new URLSearchParams(language).get("name"); console.log(name); }; 2. To obtain parameter value from query string with React Router You must use the “useLocation” hook to get parameter value from the query string with React Router. Here is how to do it! Also, check out the guidelines you should follow for best use of React hooks. import React from "react"; import { useLocation } from "react-router-dom"; constMyComponent = () => { const { search } = useLocation(); const id = new URLSearchParams(search).get("id"); console.log(id); }; useLocation hook is used to get the URL data properly. Then, you get the query string from the “search” property. Next, it passes in Search to URLSearchParams. So, you will get the value of the “id” query parameter with getting. URLSearchParams API is built into all the browsers and renders you utility methods for dealing with the query strings. If you create the new instance of URLSearchParams, you need to pass it a query string and then get back the object with the bunch of methods working with that query string. 3. To obtain parameter value from query string without react-router in reactjs app. If you do not want to use the react-router to get the parameter value from the query string, you can work in react js app. You need to use this.props.location.search. Here are the steps to follow to get URL parameter values without a react-router in the react js app. 1. Create react app Open your terminal and then execute the following common on the terminal to create the new react app. npx create-react-app my-react-app You should execute the following command on your terminal to run the React app. npm start You can check out your React app on the URL: localhost:3000 2. Install the bootstrap 4 package and the query string. To add the query string and bootstrap 4 libraries to your react project, run the command listed below next. npm install bootstrap --save npm install query-string After that, you must add the react-router and boostrap.min.css file in the src/App.js file. import React from 'react'; import '../node_modules/bootstrap/dist/css/bootstrap.min.css'; import { BrowserRouter as Router, Switch, Route } from 'react-router-dom'; function App() { return ( <div></div> ); } export default App; Create home component Create the Home.js home component by going to the react js app’s src directory. After that, you must add the following code to it. import React from 'react' importqueryString from 'query-string' class Home extends React.Component{ state = { site: 'unknown', subject: 'i don't know } handleQueryString = () => { let queries = queryString.parse(this.props.location.search) console.log(queries) this.setState(queries) } render() { return ( <div> WebSite: {this.state.site} Subject: {this.state.subject} <button> click me </button> </div> ); } } export default Home; The URL http://localhost:3000/?site=tutsmake&subject=get-query-string that can be shown in a react js application is assumed to be in your possession. As a result, when you click the button, your react js app will receive the query string parameter. 3. Add component in app.js It’s now time to include the Home.js file in the src/App.js file. The react js component can be added, as shown here. import React from 'react'; import '../node_modules/bootstrap/dist/css/bootstrap.min.css'; iimportqueryString from 'query-string' import Home from './Home' function App() { return ( <div></div> ); } export default App; 4. Multiple Query parameters import React from 'react'; import {useLocation} from "react-router-dom"; export default function EmployeeDetails() { const search = useLocation().search; const empId = new URLSearchParams(search).get('empId'); const empName = new URLSearchParams(search).get('empName'); return ( <div> <h1>Employee Details Page</h1> {empId} {empName} </div> ); } Conclusion Consequently, you will comprehend the essential techniques for obtaining parameter values from the query string. You can employ any of these techniques. Alternatively, you can hire a react developer because the developer has more knowledge and expertise in this area. React developers think out of the box when handling the project. So, you will expect the best assistance for your query or project. Remember that you can freely discuss your needs with the developer and get the right solution. They will showcase all possible ways to achieve your requirements using their expertise.