Flutter

In App Purchases (IAP) are an essential part of many mobile applications. They are used to offer extra content or features to users in exchange for a payment. Flutter is a popular mobile app development framework that has many built-in features for creating IAPs. In this tutorial, we will show you how to add In App Purchases to your Flutter project.

![flutter in app purchases iap](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover10.jpg)
## Setting up the Flutter Project
Before you can add In App Purchases to your Flutter project, you will need to set up the project. This includes installing the Flutter SDK, setting up a Flutter project, and adding the necessary packages.

### Installing the Flutter SDK
The first step is to install the Flutter SDK. You can find the installation instructions [here](https:&#x2F;&#x2F;flutter.dev&#x2F;docs&#x2F;get-started&#x2F;install).

### Setting up a Flutter Project
Once you have installed the Flutter SDK, you can create a new project by running the following command in your terminal:

&#96;&#96;&#96;
flutter create my_project
&#96;&#96;&#96;

This will create a new Flutter project in the &#96;my_project&#96; directory.

### Adding the Necessary Packages
Next, you will need to add the necessary packages to your project. You can do this by running the following command in the &#96;my_project&#96; directory:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

This will install all the necessary packages needed for your project.

## Installing in_app_purchase
The next step is to install the &#96;in_app_purchase&#96; package. This package provides all the necessary tools for adding In App Purchases to your Flutter project. You can install the package by running the following command in the &#96;my_project&#96; directory:

&#96;&#96;&#96;
flutter pub add in_app_purchase
&#96;&#96;&#96;

## Building the In App Purchases UI
Once you have installed the &#96;in_app_purchase&#96; package, you can start building the In App Purchases UI. This includes creating the necessary screens and buttons for allowing users to purchase items.

You can create a &#96;PurchaseScreen&#96; widget to display the list of items available for purchase. This widget should include a &#96;ListView&#96; for displaying the items, and a &#96;RaisedButton&#96; for allowing users to purchase the item.

&#96;&#96;&#96;dart
class PurchaseScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(&#x27;In App Purchases&#x27;),
      ),
      body: ListView(
        children: &lt;Widget&gt;[
          ListTile(
            title: Text(&#x27;Item 1&#x27;),
            trailing: RaisedButton(
              child: Text(&#x27;Purchase&#x27;),
              onPressed: () {
                &#x2F;&#x2F; Handle purchase here
              },
            ),
          ),
          ListTile(
            title: Text(&#x27;Item 2&#x27;),
            trailing: RaisedButton(
              child: Text(&#x27;Purchase&#x27;),
              onPressed: () {
                &#x2F;&#x2F; Handle purchase here
              },
            ),
          ),
        ],
      ),
    );
  }
}
&#96;&#96;&#96;

## Adding In App Purchases to the Flutter Project
Now that you have created the UI for the In App Purchases, you can start adding the necessary code for handling the purchases. This includes setting up the necessary callbacks and connecting to the payment gateway.

### Setting up the Callbacks
The first step is to set up the necessary callbacks for handling the purchases. This includes the &#96;onPurchaseSuccess&#96; and &#96;onPurchaseError&#96; callbacks. These callbacks will be called when the purchase is successful or fails respectively.

&#96;&#96;&#96;dart
void onPurchaseSuccess(PurchaseDetails purchaseDetails) {
  &#x2F;&#x2F; Handle successful purchase
}

void onPurchaseError(PurchaseError purchaseError) {
  &#x2F;&#x2F; Handle purchase error
}
&#96;&#96;&#96;

### Connecting to the Payment Gateway
The next step is to connect to the payment gateway. You can use the &#96;InAppPurchaseConnection&#96; class to connect to the payment gateway. This class provides all the necessary methods for connecting and querying the payment gateway.

&#96;&#96;&#96;dart
InAppPurchaseConnection _iap = InAppPurchaseConnection.instance;

Future&lt;void&gt; connectToPaymentGateway() async {
  bool isAvailable = await _iap.isAvailable();
  if (!isAvailable) {
    throw PlatformException(
        code: &#x27;not_available&#x27;,
        message: &#x27;The payment gateway is not available&#x27;);
  }
  _iap.connect();
}
&#96;&#96;&#96;

## Handling Different Purchase Types in Flutter
Once you have connected to the payment gateway, you can start handling different types of purchases. This includes one-time purchases, subscription purchases, and consumable purchases.

### One-Time Purchases
One-time purchases are purchases that are made once and do not require any further payments. To make a one-time purchase, you can use the &#96;buyNonConsumable&#96; method. This method takes the product identifier as an argument and returns a &#96;PurchaseDetails&#96; object.

&#96;&#96;&#96;dart
Future&lt;PurchaseDetails&gt; buyNonConsumable(String productId) async {
  PurchaseDetails purchaseDetails =
      await _iap.buyNonConsumable(productId);
  return purchaseDetails;
}
&#96;&#96;&#96;

### Subscription Purchases
Subscription purchases are purchases that require recurring payments. To make a subscription purchase, you can use the &#96;buySubscription&#96; method. This method takes the product identifier and the subscription period as arguments and returns a &#96;PurchaseDetails&#96; object.

&#96;&#96;&#96;dart
Future&lt;PurchaseDetails&gt; buySubscription(
    String productId, Duration period) async {
  PurchaseDetails purchaseDetails =
      await _iap.buySubscription(productId, period);
  return purchaseDetails;
}
&#96;&#96;&#96;

### Consumable Purchases
Consumable purchases are purchases that can be used multiple times. To make a consumable purchase, you can use the &#96;buyConsumable&#96; method. This method takes the product identifier and the number of items to purchase as arguments and returns a &#96;PurchaseDetails&#96; object.

&#96;&#96;&#96;dart
Future&lt;PurchaseDetails&gt; buyConsumable(
    String productId, int quantity) async {
  PurchaseDetails purchaseDetails =
      await _iap.buyConsumable(productId, quantity);
  return purchaseDetails;
}
&#96;&#96;&#96;

## Consuming In App Purchases in Flutter
Once a user has purchased an item, you will need to consume it. This is necessary for consumable purchases, as they can be used multiple times. To consume a purchase, you can use the &#96;consumePurchase&#96; method. This method takes the purchase token as an argument and returns a &#96;PurchaseDetails&#96; object.

&#96;&#96;&#96;dart
Future&lt;PurchaseDetails&gt; consumePurchase(String purchaseToken) async {
  PurchaseDetails purchaseDetails =
      await _iap.consumePurchase(purchaseToken);
  return purchaseDetails;
}
&#96;&#96;&#96;

## Restoring In App Purchases in Flutter
You may also need to restore In App Purchases if a user has deleted and reinstalled the app. To restore purchases, you can use the &#96;restorePurchases&#96; method. This method takes no arguments and returns a list of &#96;PurchaseDetails&#96; objects.

&#96;&#96;&#96;dart
Future&lt;List&lt;PurchaseDetails&gt;&gt; restorePurchases() async {
  List&lt;PurchaseDetails&gt; purchaseDetailsList =
      await _iap.restorePurchases();
  return purchaseDetailsList;
}
&#96;&#96;&#96;

## Running the Flutter Project
Once you have added In App Purchases to your Flutter project, you can run the project by running the following command in the &#96;my_project&#96; directory:

&#96;&#96;&#96;
flutter run
&#96;&#96;&#96;

This will build the app and launch it on your device or emulator. You can then test the In App Purchases by making purchases in the app.

## Conclusion
In this tutorial, we have shown you how to add In App Purchases to your Flutter project. We have covered setting up the project, installing the necessary packages, building the UI, and handling different types of purchases. We have also shown you how to consume and restore purchases in Flutter.

How To Add In App Purchases (IAP) in Flutter

In this tutorial, we’ll be creating an audio player in Flutter using the audioplayers plugin. We’ll be covering the following topics:

- Setting up the Flutter project
- Installing audioplayers &amp; dependencies
- Building the audio player UI
- Adding audio files to the Flutter project
- Playing audio files in Flutter
- Pausing audio files in Flutter
- Accessing the device&#x27;s microphone in Flutter
- Recording audio files in Flutter
- Running the Flutter audio player

![flutter audio player](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover4.jpg)
## Setting up the Flutter Project

Before we get started, let’s first create a new Flutter project in Android Studio. We’ll be using the default project settings and the Flutter SDK.

## Installing audioplayers &amp; Dependencies

Once the Flutter project is created, we can now install the audioplayers plugin. This plugin allows us to play, pause, and record audio files in our Flutter app.

To install the audioplayers plugin, we’ll need to add the following line to our pubspec.yaml file:

&#96;&#96;&#96;
dependencies:
  audioplayers: ^0.15.1
&#96;&#96;&#96;

We’ll also need to add the following dependencies to our pubspec.yaml file:

&#96;&#96;&#96;
dependencies:
  audioplayers: ^0.15.1
  path_provider: ^1.6.11
  permission_handler: ^5.0.2+1
&#96;&#96;&#96;

## Building the Audio Player UI

Now that we have the audioplayers plugin installed, let’s start building the audio player UI. We’ll be using a Scaffold widget to create the basic UI structure.

&#96;&#96;&#96;
Scaffold(
  appBar: AppBar(
    title: Text(&#x27;Audio Player&#x27;),
  ),
  body: Container(),
);
&#96;&#96;&#96;

## Adding Audio Files to the Flutter Project

Next, we need to add audio files to our Flutter project. We can do this by creating a new folder in the project root directory and adding audio files to it.

## Playing Audio Files in Flutter

Now that we have our audio files in the Flutter project, we can start playing them. To do this, we’ll need to use the audioplayers plugin.

First, we need to create an AudioPlayer object:

&#96;&#96;&#96;
AudioPlayer audioPlayer = AudioPlayer();
&#96;&#96;&#96;

Now, we can use the play() method to play an audio file:

&#96;&#96;&#96;
audioPlayer.play(&#x27;audio_file.mp3&#x27;);
&#96;&#96;&#96;

## Pausing Audio Files in Flutter

We can also pause an audio file by using the pause() method:

&#96;&#96;&#96;
audioPlayer.pause();
&#96;&#96;&#96;

## Accessing Device&#x27;s Microphone in Flutter

In addition to playing and pausing audio files, we can also access the device’s microphone. To do this, we’ll need to use the permission_handler plugin.

First, we need to add the following line to our pubspec.yaml file:

&#96;&#96;&#96;
dependencies:
  permission_handler: ^5.0.2+1
&#96;&#96;&#96;

Then, we can use the requestPermissions() method to request access to the device’s microphone:

&#96;&#96;&#96;
PermissionHandler().requestPermissions([PermissionGroup.microphone]);
&#96;&#96;&#96;

## Recording Audio Files in Flutter

Once we have access to the device’s microphone, we can start recording audio files. To do this, we’ll need to use the audioplayers plugin.

First, we need to create an AudioRecorder object:

&#96;&#96;&#96;
AudioRecorder audioRecorder = AudioRecorder();
&#96;&#96;&#96;

Now, we can use the start() method to start recording an audio file:

&#96;&#96;&#96;
audioRecorder.start();
&#96;&#96;&#96;

## Running the Flutter Audio Player

Finally, we can run our Flutter audio player. To do this, we’ll need to press the “Run” button in Android Studio.

Once the app is running, we should be able to play, pause, and record audio files.

## Conclusion

In this tutorial, we’ve learned how to create an audio player in Flutter using the audioplayers plugin. We’ve covered the following topics:

- Setting up the Flutter project
- Installing audioplayers &amp; dependencies
- Building the audio player UI
- Adding audio files to the Flutter project
- Playing audio files in Flutter
- Pausing audio files in Flutter
- Accessing the device&#x27;s microphone in Flutter
- Recording audio files in Flutter
- Running the Flutter audio player

We hope this tutorial has been helpful and that you’ve learned something new. Thanks for reading!

Creating an Audio Player in Flutter

Flutter is an open-source mobile application development framework created by Google. It is used to develop cross-platform applications for Android, iOS, Windows, Mac, Linux, Google Fuchsia, and the web from a single codebase. Flutter apps are written in Dart, a programming language developed by Google.

The performance of a Flutter app is determined by how efficiently the code is written and the techniques used to optimize it. In this article, we&#x27;ll look at how Flutter works under the hood and explore some of the performance optimization techniques used in Flutter apps.

![flutter performance](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover14.jpg)
## How Does Flutter Work Under the Hood?

Flutter works by running Dart code on a virtual machine (VM). The VM is responsible for executing code, managing memory, and garbage collection. The VM is also responsible for creating a user interface (UI) by creating widgets and laying them out on the screen.

The Flutter framework also provides a number of APIs and libraries that help developers create complex applications quickly and easily. These include the Material Design library, the Cupertino library, and the Animations library.

## Performance Optimization Techniques in Flutter

Performance optimization is an important part of developing any application. There are a number of techniques available to optimize the performance of a Flutter app. These include:

### Minimizing Memory Use

One of the most important performance optimization techniques is to minimize the amount of memory used by the application. This can be done by avoiding object creation and instead reusing existing objects. It can also be done by using the &#96;static&#96; keyword for variables that don&#x27;t need to be recreated each time the function is called.

### Reducing CPU Usage

Reducing CPU usage is also a key performance optimization technique. This can be done by using asynchronous programming techniques such as Futures and Streams, or by using the &#96;async&#96; keyword to create asynchronous functions.

### Optimizing Widgets

Optimizing widgets is another important performance optimization technique. This can be done by using the &#96;const&#96; keyword to create immutable widgets, or by using the &#96;build&#96; method to create widgets that are only built once and then reused.

### Avoiding Unnecessary Rendering

Rendering can be a time-consuming process, so it&#x27;s important to avoid unnecessary rendering. This can be done by using the &#96;StatefulWidget&#96; class and the &#96;setState&#96; method to only update the parts of the UI that have changed. It can also be done by using the &#96;RepaintBoundary&#96; widget to prevent unnecessary redraws.

### Optimizing Network Requests

Optimizing network requests is another important performance optimization technique. This can be done by using caching techniques such as the &#96;CacheManager&#96; class or by using the &#96;HttpClient&#96; class to make asynchronous requests.

### Using Profiling Tools

Finally, it&#x27;s important to use profiling tools to identify performance bottlenecks. Flutter provides a number of profiling tools such as the Flutter Inspector, the Performance Monitor, and the Memory Monitor. These tools can be used to identify and fix performance issues.

## Conclusion

Performance optimization is an important part of developing any application, and Flutter provides a number of techniques to optimize the performance of a Flutter app. By minimizing memory use, reducing CPU usage, optimizing widgets, avoiding unnecessary rendering, optimizing network requests, and using profiling tools, developers can create applications that run smoothly and efficiently.

Optimizing Performance in Flutter Apps

In the world of mobile app development, two of the most popular platforms are Flutter and Ionic. Both have their own advantages and drawbacks, and it can be difficult to determine which one is the best choice for your project. In this guide, we&#x27;ll compare Flutter and Ionic, looking at their main differences, code samples, advantages and drawbacks, and alternatives.

![flutter vs ionic](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover12.jpg)
## What Is Flutter?

Flutter is an open-source UI development kit created by Google. It enables developers to create beautiful, natively compiled applications for mobile, web, and desktop from a single codebase. Flutter apps are written in the Dart programming language, and they can be deployed to both Android and iOS devices.

## What Is Ionic?

Ionic is an open-source framework for building hybrid mobile apps. It enables developers to create apps that have a native look and feel, but are actually web apps running in a native browser. Ionic apps are written in HTML, CSS, and JavaScript, and they can be deployed to both Android and iOS devices.

## Main Differences Between Flutter vs. Ionic

There are several key differences between Flutter and Ionic:

- **Language:** Flutter apps are written in the Dart programming language, while Ionic apps are written in HTML, CSS, and JavaScript.

- **Performance:** Flutter apps are compiled to native code, which makes them faster and more responsive than Ionic apps, which are running in a webview.

- **Cross-platform support:** Flutter apps can be deployed to both Android and iOS devices, while Ionic apps can only be deployed to Android and iOS devices.

- **Development time:** Flutter apps can be developed faster than Ionic apps, as they don&#x27;t require a separate codebase for each platform.

## Flutter &amp; Dart Code Samples

Here is a basic example of a Flutter app written in Dart:

&#96;&#96;&#96;dart
import &#x27;package:flutter&#x2F;material.dart&#x27;;

void main() =&gt; runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: &#x27;Flutter Demo&#x27;,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: &#x27;Flutter Demo Home Page&#x27;),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() =&gt; _MyHomePageState();
}

class _MyHomePageState extends State&lt;MyHomePage&gt; {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Text(&#x27;Hello World!&#x27;),
      ),
    );
  }
}
&#96;&#96;&#96;

## Ionic Code Samples

Here is a basic example of an Ionic app written in HTML, CSS, and JavaScript:

&#96;&#96;&#96;html
&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;meta charset=&quot;utf-8&quot; &#x2F;&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot; &#x2F;&gt;
    &lt;title&gt;Ionic App&lt;&#x2F;title&gt;
  &lt;&#x2F;head&gt;
  &lt;body&gt;
    &lt;div class=&quot;app&quot;&gt;
      &lt;h1&gt;Hello World!&lt;&#x2F;h1&gt;
    &lt;&#x2F;div&gt;
  &lt;&#x2F;body&gt;
&lt;&#x2F;html&gt;
&#96;&#96;&#96;

&#96;&#96;&#96;css
.app {
  text-align: center;
}
&#96;&#96;&#96;

&#96;&#96;&#96;js
const app = document.querySelector(&#x27;.app&#x27;);

app.addEventListener(&#x27;click&#x27;, () =&gt; {
  console.log(&#x27;Hello World!&#x27;);
});
&#96;&#96;&#96;

## Advantages of Flutter

- **Fast Development:** Flutter&#x27;s hot reload feature makes it easy to quickly iterate on your app and see changes in real-time.

- **Native Performance:** Flutter apps are compiled to native code, which makes them faster and more responsive than Ionic apps.

- **Cross-platform Support:** Flutter apps can be deployed to both Android and iOS devices.

- **Customizable UI:** Flutter&#x27;s UI components are highly customizable, allowing you to create beautiful native apps with ease.

## Advantages of Ionic

- **Web-based Development:** Ionic apps are written in HTML, CSS, and JavaScript, which makes them easy to develop and maintain.

- **Cross-platform Support:** Ionic apps can be deployed to both Android and iOS devices.

- **Third-party Libraries:** Ionic has a large selection of third-party libraries, which makes it easy to add features to your app.

- **Integration with Native APIs:** Ionic apps can access native device features such as camera, contacts, and geolocation.

## Drawbacks of Flutter

- **Steep Learning Curve:** Flutter&#x27;s Dart programming language is relatively new and can be difficult to learn.

- **Limited Third-party Libraries:** Flutter has a limited selection of third-party libraries compared to Ionic.

## Drawbacks of Ionic

- **Slower Performance:** Ionic apps are running in a webview, which can cause them to be slower and less responsive than native apps.

- **Limited Customization:** Ionic&#x27;s UI components are limited in terms of customization.

## Alternatives to Flutter and Ionic

If you&#x27;re looking for alternatives to Flutter and Ionic, here are some of the most popular options:

- **React Native:** React Native is a popular cross-platform framework for building native apps with JavaScript.

- **Xamarin:** Xamarin is a cross-platform framework for building native apps with C# and .NET.

- **NativeScript:** NativeScript is a framework for building native apps with JavaScript.

- **Kotlin Multiplatform:** Kotlin Multiplatform is a framework for building native apps with Kotlin.

Flutter vs. Ionic - Complete Comparison (2023)

WebViews are a great way to display HTML content in your Flutter app. They allow you to embed web content such as videos, maps, or other interactive content directly into your app. In this article, we&#x27;ll discuss what WebViews are, how to use them in Flutter, and some tips on debugging them.

![flutter webview](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover2.jpg)
## What Is a WebView in Flutter?

A WebView is a widget that displays web content in your Flutter app. It uses a browser engine to render webpages, and can be used to display HTML, SVG, and other web content.

## How to Use WebView in Flutter?

Using a WebView in Flutter is easy. All you need to do is create an instance of the &#96;WebView&#96; widget, and provide it with the URL of the web page you want to show. Here&#x27;s an example:

&#96;&#96;&#96;dart
WebView(
  initialUrl: &#x27;https:&#x2F;&#x2F;www.example.com&#x2F;&#x27;,
)
&#96;&#96;&#96;

## WebView Code Examples in Flutter

Here are some more examples of WebViews in Flutter. 

### Showing a Webpage in a Fullscreen WebView

If you want to show a web page in a fullscreen WebView, you can use the &#96;expanded&#96; parameter:

&#96;&#96;&#96;dart
WebView(
  initialUrl: &#x27;https:&#x2F;&#x2F;www.example.com&#x2F;&#x27;,
  expanded: true,
)
&#96;&#96;&#96;

### Showing a Webpage with a Custom User Agent

If you want to specify a custom user agent for the WebView, you can use the &#96;userAgent&#96; parameter:

&#96;&#96;&#96;dart
WebView(
  initialUrl: &#x27;https:&#x2F;&#x2F;www.example.com&#x2F;&#x27;,
  userAgent: &#x27;MyCustomUserAgent&#x27;,
)
&#96;&#96;&#96;

### Showing a Webpage with JavaScript Enabled

If you want to enable JavaScript in the WebView, you can use the &#96;javascriptMode&#96; parameter:

&#96;&#96;&#96;dart
WebView(
  initialUrl: &#x27;https:&#x2F;&#x2F;www.example.com&#x2F;&#x27;,
  javascriptMode: JavascriptMode.unrestricted,
)
&#96;&#96;&#96;

## Various WebView Properties in Flutter

The &#96;WebView&#96; widget has many properties that you can use to customize its behavior. Here are some of the more important ones:

- &#96;initialUrl&#96;: The URL of the web page to be shown.
- &#96;expanded&#96;: Whether the WebView should be shown in fullscreen mode.
- &#96;userAgent&#96;: The custom user agent to be used by the WebView.
- &#96;javascriptMode&#96;: The JavaScript mode to be used by the WebView.
- &#96;debuggingEnabled&#96;: Whether to enable debugging for the WebView.

## How to Debug Webviews in Flutter?

Debugging a WebView in Flutter is easy. All you need to do is set the &#96;debuggingEnabled&#96; property to &#96;true&#96;:

&#96;&#96;&#96;dart
WebView(
  initialUrl: &#x27;https:&#x2F;&#x2F;www.example.com&#x2F;&#x27;,
  debuggingEnabled: true,
)
&#96;&#96;&#96;

Once you do this, you can open the Chrome DevTools by pressing the &#96;Ctrl+Shift+I&#96; (or &#96;Cmd+Option+I&#96; on macOS) keyboard shortcut.

## Conclusion

In this article, we discussed how to use WebViews in Flutter and some tips on debugging them. WebViews are a great way to display HTML content in your Flutter app, and they can be easily customized with various properties. We also discussed how to enable debugging for WebViews in Flutter.

How to Use WebViews in Flutter

If you’re looking for a comprehensive guide to the Flutter Listview class, you’ve come to the right place. In this article, we’ll explore the fundamentals of the Listview class and its various features, including horizontal Listview, Listview with section headers, Listview with sticky headers, Listview with pull to refresh, Listview with infinite scroll, Listview with custom header and footer, and empty state in Listview. We’ll also provide concrete code snippets with documentation to help you get the most out of the Listview.

![flutter listview](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover1.jpg)
## What Is Listview in Flutter?

Listview is a scrollable, linear list of widgets. It’s a powerful tool for displaying large amounts of data in a concise, organized manner. The Listview widget is used to create lists in Flutter. It’s important to note that Listview is not a replacement for the List widget. While Listview is used for scrolling lists of data, List is used for static lists of data.

## How to Use Listview in Flutter?

To use Listview in Flutter, you need to import the Listview class from the material library. You can do this with the following code:

&#96;&#96;&#96;dart
import &#x27;package:flutter&#x2F;material.dart&#x27;;
&#96;&#96;&#96;

Once you’ve imported the Listview class, you can start building your list. To create a simple Listview, you can use the following code:

&#96;&#96;&#96;dart
ListView(
  children: &lt;Widget&gt;[
    Text(&#x27;Item 1&#x27;),
    Text(&#x27;Item 2&#x27;),
    Text(&#x27;Item 3&#x27;),
  ],
),
&#96;&#96;&#96;

## Horizontal Listview in Flutter

If you want to create a horizontal Listview instead of a vertical one, you can use the following code:

&#96;&#96;&#96;dart
ListView(
  scrollDirection: Axis.horizontal,
  children: &lt;Widget&gt;[
    Text(&#x27;Item 1&#x27;),
    Text(&#x27;Item 2&#x27;),
    Text(&#x27;Item 3&#x27;),
  ],
),
&#96;&#96;&#96;

## Listview with Section Headers in Flutter

If you’re looking to add section headers to your Listview, you can use the following code:

&#96;&#96;&#96;dart
ListView.separated(
  itemCount: 10,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(&#x27;Item $index&#x27;),
    );
  },
  separatorBuilder: (context, index) {
    return Divider(
      color: Colors.black,
    );
  },
),
&#96;&#96;&#96;

## Listview with Sticky Headers in Flutter

To create a sticky header Listview, you need to use a SliverList and a SliverStickyHeader widget. You can do this with the following code:

&#96;&#96;&#96;dart
SliverList(
  delegate: SliverChildListDelegate([
    SliverStickyHeader(
      header: Container(
        color: Colors.black,
        padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
        child: Text(&#x27;Header&#x27;),
      ),
      sliver: SliverList(
        delegate: SliverChildListDelegate([
          Text(&#x27;Item 1&#x27;),
          Text(&#x27;Item 2&#x27;),
          Text(&#x27;Item 3&#x27;),
        ]),
      ),
    ),
  ]),
),
&#96;&#96;&#96;

## Listview with Pull to Refresh in Flutter

If you want to add pull to refresh functionality to your Listview, you can use the RefreshIndicator widget. You can do this with the following code:

&#96;&#96;&#96;dart
RefreshIndicator(
  onRefresh: () async {
    &#x2F;&#x2F; Refresh your data here
  },
  child: ListView(
    children: &lt;Widget&gt;[
      Text(&#x27;Item 1&#x27;),
      Text(&#x27;Item 2&#x27;),
      Text(&#x27;Item 3&#x27;),
    ],
  ),
),
&#96;&#96;&#96;

## Listview with Infinite Scroll in Flutter

If you want to add infinite scroll functionality to your Listview, you can use the ListView.builder widget. You can do this with the following code:

&#96;&#96;&#96;dart
ListView.builder(
  itemCount: 10,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(&#x27;Item $index&#x27;),
    );
  },
),
&#96;&#96;&#96;

## Listview with Custom Header &amp; Footer in Flutter

If you want to add custom header and footer widgets to your Listview, you can use the ListView.builder widget. You can do this with the following code:

&#96;&#96;&#96;dart
ListView.builder(
  itemCount: 10,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(&#x27;Item $index&#x27;),
    );
  },
  &#x2F;&#x2F; Add a custom header
  header: Container(
    color: Colors.black,
    padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
    child: Text(&#x27;Header&#x27;),
  ),
  &#x2F;&#x2F; Add a custom footer
  footer: Container(
    color: Colors.black,
    padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
    child: Text(&#x27;Footer&#x27;),
  ),
),
&#96;&#96;&#96;

## Empty State in Listview in Flutter

If you want to add an empty state to your Listview, you can use the ListView.builder widget. You can do this with the following code:

&#96;&#96;&#96;dart
ListView.builder(
  itemCount: 10,
  itemBuilder: (context, index) {
    if (index == 0) {
      return Container(
        color: Colors.black,
        padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
        child: Text(&#x27;Empty State&#x27;),
      );
    }
    return ListTile(
      title: Text(&#x27;Item $index&#x27;),
    );
  },
),
&#96;&#96;&#96;

We hope this Flutter Listview class cheatsheet has been helpful. To learn more about Flutter, check out our other tutorials.

Flutter Listview Class Cheatsheet

Retrieving device information in a Flutter app is an important task. It can be used to provide a better user experience, better analytics, and more. Fortunately, there is an easy way to do this: the &#96;device_info_plus&#96; plugin. This plugin provides access to various device info properties in Flutter.

![flutter device info](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover11.jpg)
## Installing device_info_plus
To get started, you&#x27;ll need to add the &#96;device_info_plus&#96; plugin to your &#96;pubspec.yaml&#96; file.
&#96;&#96;&#96;dart
dependencies:
  device_info_plus: ^1.1.0
&#96;&#96;&#96;
Once you&#x27;ve added the plugin, simply run &#96;flutter packages get&#96; in your project&#x27;s root directory.

## Retrieving Device Info in Flutter
Retrieving device info in Flutter is easy with the &#96;device_info_plus&#96; plugin. To get started, you&#x27;ll need to create a new instance of the &#96;DeviceInfoPlus&#96; class.

&#96;&#96;&#96;dart
DeviceInfoPlus deviceInfoPlus = DeviceInfoPlus();
&#96;&#96;&#96;

Once you have an instance, you can call the &#96;getInfo()&#96; method to get the device&#x27;s info.

&#96;&#96;&#96;dart
DeviceInfo info = await deviceInfoPlus.getInfo();
&#96;&#96;&#96;

## Various Device Info Properties in Flutter
Now that you have the device info, you can access various properties of the device. Here are some of the most commonly used properties of the &#96;DeviceInfo&#96; class:

- &#96;model&#96;: The device&#x27;s model name
- &#96;brand&#96;: The device&#x27;s brand name
- &#96;name&#96;: The device&#x27;s name
- &#96;version&#96;: The OS version
- &#96;device&#96;: The device type (e.g. iPhone, iPad, etc.)
- &#96;id&#96;: The device&#x27;s unique identifier

You can access these properties in the following way:

&#96;&#96;&#96;dart
String model = info.model;
String brand = info.brand;
String name = info.name;
String version = info.version;
String device = info.device;
String id = info.id;
&#96;&#96;&#96;

You can also access more detailed device information such as the device&#x27;s processor, RAM, and more. Refer to the &#96;DeviceInfoPlus&#96; documentation for more information.

## Conclusion
Retrieving device info in Flutter is easy with the &#96;device_info_plus&#96; plugin. With it, you can easily access various device info properties such as the device&#x27;s model, brand, name, version, device type, and unique identifier.

How to Retrieve Device Info in Flutter

These days, mobile applications are becoming more and more complex. One of the most important features for any mobile app is the ability to access and manage files. This is where the Flutter File Picker comes in. With the File Picker, users can access their device’s file system and select a file to use in their app.

In this tutorial, we’ll show you how to build a Flutter File Picker. We’ll cover everything from creating the project to implementing the File Picker in your app. Let’s get started!

![flutter file picker](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover8.jpg)
## Creating the Flutter Project

The first step is to create a new Flutter project. To do this, open up the terminal and run the following command:

&#96;&#96;&#96;
flutter create &lt;project_name&gt;
&#96;&#96;&#96;

Replace &#96;&lt;project_name&gt;&#96; with the name of your project.

Once the project is created, open it in your favorite code editor.

## Installing file_picker

The next step is to install the &#96;file_picker&#96; package. This is a popular package that allows you to access files from the device’s file system.

To install it, open up the &#96;pubspec.yaml&#96; file and add the following line:

&#96;&#96;&#96;
dependencies:
  file_picker: ^1.6.1
&#96;&#96;&#96;

Now save the file and run the following command in the terminal to install the package:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

## Implementing the File Picker in Flutter

Now that we have everything set up, let’s take a look at how to implement the File Picker.

First, we need to import the &#96;file_picker&#96; package into our project. To do this, open the &#96;main.dart&#96; file and add the following line at the top:

&#96;&#96;&#96;dart
import &#x27;package:file_picker&#x2F;file_picker.dart&#x27;;
&#96;&#96;&#96;

Now, we can create a function that will open the File Picker. This function should return a &#96;Future&#96; that will contain the selected file.

&#96;&#96;&#96;dart
Future&lt;File&gt; openFilePicker() async {
  FilePickerResult result = await FilePicker.platform.pickFiles();
  if (result != null) {
    return result.files.first;
  }
  return null;
}
&#96;&#96;&#96;

The &#96;openFilePicker()&#96; function will open the File Picker and allow the user to select a file. Once the user has selected a file, the function will return it as a &#96;File&#96; object.

Finally, we can call the &#96;openFilePicker()&#96; function whenever we need the user to select a file. For example, if we wanted to select an image, we could do the following:

&#96;&#96;&#96;dart
Future&lt;void&gt; selectImage() async {
  File imageFile = await openFilePicker();
  if (imageFile != null) {
    &#x2F;&#x2F; Do something with the image file
  }
}
&#96;&#96;&#96;

In this example, we call the &#96;openFilePicker()&#96; function and use the returned &#96;File&#96; object to do something with the image.

## Conclusion

In this tutorial, we showed you how to build a Flutter File Picker. We covered everything from creating the project to implementing the File Picker in your app. We hope you found this tutorial helpful and that you’ll be able to use the File Picker in your own projects.

How to Build a Flutter File Picker

Google Directions API is a powerful tool for developers to get directions and travel times between two locations. It can be used to generate routes, calculate distances, and provide estimated travel times for various transportation modes like walking, cycling, or driving. In this tutorial, we’ll look at how to use Google Directions API in Flutter.

![flutter directions api](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover19.jpg)
## What is Google&#x27;s Directions API?

Google Directions API is a web service that provides directions between two or more locations. It is part of the Google Maps Platform and provides a comprehensive set of APIs that allow developers to build custom applications with powerful mapping and routing capabilities. The API allows developers to generate directions with detailed information such as turn-by-turn instructions, travel times, and estimated distances.

## Prerequisites

In order to use Google Directions API in Flutter, you’ll need the following:

- A Google Cloud Platform account.
- A Google Maps Platform API Key.
- The Flutter SDK installed.
- An IDE such as Android Studio or Visual Studio Code.

## Setting Up The Flutter Project

To get started, create a new Flutter project in your IDE.

Open the pubspec.yaml file and add the google_maps_webservice package to the dependencies section:

&#96;&#96;&#96;
dependencies:
  google_maps_webservice: ^0.2.2
&#96;&#96;&#96;

Then, run the following command to install the package:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

## Installing Dependencies &amp; Setup

Once the package is installed, you’ll need to set up the Google Maps Platform API Key. To do this, open the Google Cloud Platform Console and click on the “APIs &amp; Services” tab. Then, click on “Credentials” and create a new API Key.

Next, open the AndroidManifest.xml file in the android&#x2F;app&#x2F;src&#x2F;main&#x2F; folder and add the following line to the application section:

&#96;&#96;&#96;
&lt;meta-data
    android:name=&quot;com.google.android.geo.API_KEY&quot;
    android:value=&quot;YOUR_API_KEY&quot;&#x2F;&gt;
&#96;&#96;&#96;

Replace YOUR_API_KEY with your own API key.

## How to Use Google Directions API in Flutter?

Using the Google Directions API in Flutter is quite simple. You’ll need to call the Google Directions API with the start and end locations, and then parse the response.

Here’s an example of how to make a request to the Directions API and parse the response:

&#96;&#96;&#96;
import &#x27;package:google_maps_webservice&#x2F;directions.dart&#x27;;

final GoogleMapsDirections _directions =
    GoogleMapsDirections(apiKey: YOUR_API_KEY);

final DirectionsResponse response = await _directions.directionsWithLocation(
  Location(startLatitude, startLongitude),
  Location(endLatitude, endLongitude),
);

if (response.isOkay) {
  &#x2F;&#x2F; Do something with the response
}
&#96;&#96;&#96;

## How to Draw a Route on a Map in Flutter?

Once you’ve received a response from the Directions API, you can use the response to draw a route on a map.

To draw a route on a map, you’ll need to use the polyline package. To install the package, add the following line to the pubspec.yaml file:

&#96;&#96;&#96;
dependencies:
  polyline: ^1.0.0
&#96;&#96;&#96;

Then, run the following command to install the package:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

Once the package is installed, you can use the response from the Directions API to draw a route on the map. Here’s an example of how to do it:

&#96;&#96;&#96;
import &#x27;package:google_maps_webservice&#x2F;directions.dart&#x27;;
import &#x27;package:polyline&#x2F;polyline.dart&#x27;;

final GoogleMapsDirections _directions =
    GoogleMapsDirections(apiKey: YOUR_API_KEY);

final DirectionsResponse response = await _directions.directionsWithLocation(
  Location(startLatitude, startLongitude),
  Location(endLatitude, endLongitude),
);

if (response.isOkay) {
  &#x2F;&#x2F; Get the encoded polyline from the response
  final String encodedPolyline = response.routes[0].overviewPolyline.points;
  
  &#x2F;&#x2F; Decode the polyline
  final List&lt;PointLatLng&gt; points = decodePolyline(encodedPolyline);
  
  &#x2F;&#x2F; Create a Polyline
  final Polyline polyline = Polyline(
    points: points,
    strokeWidth: 5,
    color: Colors.blue,
  );
  
  &#x2F;&#x2F; Add the Polyline to the map
  mapController.addPolyline(polyline);
}
&#96;&#96;&#96;

## Various Use Cases for Google&#x27;s Directions API in Mobile Apps

Google Directions API can be used in a variety of mobile applications. It can be used to generate turn-by-turn navigation instructions for applications like ridesharing and delivery services. It can also be used to calculate the estimated travel time between two locations for applications like ride-hailing. Additionally, it can be used to generate routes for applications like fitness and running apps.

How to Use Google Directions API in Flutter

# Data Storage in Flutter - Ultimate Guide

Data storage is an essential part of any application. It helps developers to store and access data easily. In this guide, we will explore the different types of data storage available in Flutter and how to use them.

![flutter data storage](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover16.jpg)
## What is Data Storage?

Data storage is the process of preserving data in a permanent form. This includes storing data on physical media (such as hard disks, CDs, and DVDs) or in digital form (such as databases, cloud storage, and other online services). It also includes storing data in memory (such as RAM) for quick access.

## Why Do We Need Data Storage?

Data storage is important for a number of reasons. It helps us to keep track of data and make it available to users. It also helps to ensure that data is not lost or corrupted. Data storage also helps to optimize the performance of applications by providing quick access to the data.

## What are the Different Types of Data Storage?

There are several different types of data storage available in Flutter. Some of the most common types are:

- **SharedPreferences**: SharedPreferences is a key-value store that allows developers to store primitive data types (strings, numbers, booleans, etc.) in a persistent way. It is useful for storing user preferences and settings.

- **SQLite**: SQLite is a powerful relational database system that allows developers to store structured data. It is an open-source library that is available in Flutter.

- **Realm**: Realm is an object-oriented database that allows developers to store and query objects. It is an open-source solution that is available in Flutter.

- **Secure Storage (Keychain)**: Secure Storage (Keychain) is a platform-agnostic way to store sensitive data securely. It is available in Flutter as a third-party library.

- **Disk Storage**: Disk Storage is a file-based storage system that allows developers to store data on a physical disk. It is available in Flutter as a third-party library.

## Using SharedPreferences in Flutter

SharedPreferences is a key-value store that allows developers to store primitive data types in a persistent way. To use SharedPreferences in Flutter, we need to first import the &#96;shared_preferences&#96; package.

&#96;&#96;&#96;dart
import &#x27;package:shared_preferences&#x2F;shared_preferences.dart&#x27;;
&#96;&#96;&#96;

Then, we can use the &#96;SharedPreferences&#96; class to set and get values from the store. Here is an example of how to set and get a string value in the store:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Set a string value
SharedPreferences.getInstance().then((prefs) {
  prefs.setString(&#x27;myKey&#x27;, &#x27;myValue&#x27;);
});

&#x2F;&#x2F; Get a string value
SharedPreferences.getInstance().then((prefs) {
  String myValue = prefs.getString(&#x27;myKey&#x27;);
});
&#96;&#96;&#96;

For more information, see the [SharedPreferences API documentation](https:&#x2F;&#x2F;pub.dev&#x2F;documentation&#x2F;shared_preferences&#x2F;latest&#x2F;).

## Using SQLite in Flutter

SQLite is a powerful relational database system that allows developers to store structured data. To use SQLite in Flutter, we need to first import the &#96;sqflite&#96; package.

&#96;&#96;&#96;dart
import &#x27;package:sqflite&#x2F;sqflite.dart&#x27;;
&#96;&#96;&#96;

Then, we can use the &#96;Database&#96; class to open and manage a SQLite database. Here is an example of how to open a database and create a table:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Open a database
Database db = await openDatabase(&#x27;my_database.db&#x27;);

&#x2F;&#x2F; Create a table
await db.execute(
  &#x27;CREATE TABLE IF NOT EXISTS myTable (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)&#x27;,
);
&#96;&#96;&#96;

For more information, see the [SQLite API documentation](https:&#x2F;&#x2F;pub.dev&#x2F;documentation&#x2F;sqflite&#x2F;latest&#x2F;).

## Using Realm in Flutter

Realm is an object-oriented database that allows developers to store and query objects. To use Realm in Flutter, we need to first import the &#96;realm&#96; package.

&#96;&#96;&#96;dart
import &#x27;package:realm&#x2F;realm.dart&#x27;;
&#96;&#96;&#96;

Then, we can use the &#96;Realm&#96; class to open and manage a Realm database. Here is an example of how to open a database and create a table:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Open a database
Realm realm = await openRealm(&#x27;my_database.realm&#x27;);

&#x2F;&#x2F; Create a table
await realm.execute(
  &#x27;CREATE TABLE IF NOT EXISTS myTable (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)&#x27;,
);
&#96;&#96;&#96;

For more information, see the [Realm API documentation](https:&#x2F;&#x2F;pub.dev&#x2F;documentation&#x2F;realm&#x2F;latest&#x2F;).

## Secure Storage (Keychain) in Flutter

Secure Storage (Keychain) is a platform-agnostic way to store sensitive data securely. To use Secure Storage in Flutter, we need to first import the &#96;flutter_secure_storage&#96; package.

&#96;&#96;&#96;dart
import &#x27;package:flutter_secure_storage&#x2F;flutter_secure_storage.dart&#x27;;
&#96;&#96;&#96;

Then, we can use the &#96;FlutterSecureStorage&#96; class to set and get values from the store. Here is an example of how to set and get a string value in the store:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Set a string value
FlutterSecureStorage.write(key: &#x27;myKey&#x27;, value: &#x27;myValue&#x27;);

&#x2F;&#x2F; Get a string value
String myValue = FlutterSecureStorage.read(key: &#x27;myKey&#x27;);
&#96;&#96;&#96;

For more information, see the [Secure Storage API documentation](https:&#x2F;&#x2F;pub.dev&#x2F;documentation&#x2F;flutter_secure_storage&#x2F;latest&#x2F;).

## Disk Storage in Flutter

Disk Storage is a file-based storage system that allows developers to store data on a physical disk. To use Disk Storage in Flutter, we need to first import the &#96;path_provider&#96; package.

&#96;&#96;&#96;dart
import &#x27;package:path_provider&#x2F;path_provider.dart&#x27;;
&#96;&#96;&#96;

Then, we can use the &#96;PathProvider&#96; class to get the application&#x27;s documents directory. We can then use the &#96;dart:io&#96; library to create files in this directory. Here is an example of how to create a file in the documents directory:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Get the documents directory
Directory documentsDirectory = await getApplicationDocumentsDirectory();

&#x2F;&#x2F; Create a file
File myFile = File(&#x27;${documentsDirectory.path}&#x2F;my_file.txt&#x27;);
await myFile.create();
&#96;&#96;&#96;

For more information, see the [PathProvider API documentation](https:&#x2F;&#x2F;pub.dev&#x2F;documentation&#x2F;path_provider&#x2F;latest&#x2F;).

## Conclusion

Data storage is an essential part of any application. In this guide, we explored the different types of data storage available in Flutter and how to use them. We looked at SharedPreferences, SQLite, Realm, Secure Storage (Keychain), and Disk Storage. We also provided code examples for each type of storage.

Data Storage in Flutter - Utimate Guide

Push notifications are an important part of modern mobile development, and can be used to keep users engaged and informed about events in your app. In this article, we&#x27;ll look at how to send push notifications in Flutter using OneSignal, a popular third-party service.

![flutter push notifications onesignal](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover20.jpg)
## Prerequisites

Before getting started, you&#x27;ll need to have the following installed on your machine:

- Flutter SDK
- An IDE (Android Studio, Visual Studio Code, etc.)
- OneSignal account

## Creating a Flutter Project

Once you&#x27;ve installed the prerequisites, you can create a new Flutter project. Open up your terminal and type the following command:

&#96;&#96;&#96;bash
flutter create &lt;project_name&gt;
&#96;&#96;&#96;

Replace &#96;&lt;project_name&gt;&#96; with the name of your project. Once the project has been created, you can open it in your IDE of choice.

## Installing OneSignal Dependencies

We&#x27;ll be using the &#96;onesignal_flutter&#96; package to send push notifications in Flutter. To install it, open up the &#96;pubspec.yaml&#96; file and add the following line:

&#96;&#96;&#96;yaml
dependencies:
  onesignal_flutter: ^1.0.9
&#96;&#96;&#96;

Once you&#x27;ve added the dependency, you can run the following command in the terminal to install it:

&#96;&#96;&#96;bash
flutter packages get
&#96;&#96;&#96;

## Sending Push Notifications in Flutter Using OneSignal

Now that we have all of the necessary dependencies, we can start sending push notifications in Flutter using OneSignal.

First, we&#x27;ll need to configure our OneSignal account. To do this, head over to the [OneSignal dashboard](https:&#x2F;&#x2F;onesignal.com&#x2F;dashboard) and create an account. Once you&#x27;ve signed up, you&#x27;ll need to create a new app and add a platform. Choose &#96;Android&#96; as the platform and fill in the necessary details.

Next, we&#x27;ll need to add the OneSignal SDK to our Flutter project. To do this, open up the &#96;AndroidManifest.xml&#96; file and add the following lines:

&#96;&#96;&#96;xml
&lt;!-- OneSignal --&gt;
&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; &#x2F;&gt;
&lt;uses-permission android:name=&quot;android.permission.WAKE_LOCK&quot; &#x2F;&gt;
&lt;uses-permission android:name=&quot;android.permission.VIBRATE&quot; &#x2F;&gt;
&lt;application&gt;
  &lt;!-- OneSignal --&gt;
  &lt;meta-data android:name=&quot;onesignal_app_id&quot; android:value=&quot;&lt;ONESIGNAL_APP_ID&gt;&quot; &#x2F;&gt;
  &lt;meta-data android:name=&quot;onesignal_google_project_number&quot; android:value=&quot;&lt;ONESIGNAL_GOOGLE_PROJECT_NUMBER&gt;&quot; &#x2F;&gt;
&lt;&#x2F;application&gt;
&#96;&#96;&#96;

Replace &#96;&lt;ONESIGNAL_APP_ID&gt;&#96; and &#96;&lt;ONESIGNAL_GOOGLE_PROJECT_NUMBER&gt;&#96; with your OneSignal app ID and Google project number respectively.

Now, we can start sending push notifications in Flutter using OneSignal. To do this, we&#x27;ll need to initialize the OneSignal SDK in our &#96;main.dart&#96; file:

&#96;&#96;&#96;dart
import &#x27;package:onesignal_flutter&#x2F;onesignal_flutter.dart&#x27;;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await OneSignal.shared.init(&quot;&lt;ONESIGNAL_APP_ID&gt;&quot;);
  runApp(MyApp());
}
&#96;&#96;&#96;

Replace &#96;&lt;ONESIGNAL_APP_ID&gt;&#96; with your OneSignal app ID.

Finally, we can send push notifications in Flutter using OneSignal. To do this, we&#x27;ll need to call the &#96;sendNotification&#96; method:

&#96;&#96;&#96;dart
await OneSignal.shared.sendNotification(
  OSNotification(
    title: &#x27;Hello World!&#x27;,
    body: &#x27;This is a test notification&#x27;,
    contentAvailable: true
  )
);
&#96;&#96;&#96;

This will send a push notification with the title &#96;Hello World!&#96; and the body &#96;This is a test notification&#96;.

## Conclusion

In this article, we looked at how to send push notifications in Flutter using OneSignal. We installed the necessary dependencies, configured our OneSignal account, and sent a test notification. With the help of OneSignal, you can easily send push notifications in Flutter and keep users engaged and informed.

Push Notifications in Flutter Using OneSignal

In this article, we will be exploring how to create a Speech to Text dictation app in Flutter. We will cover the prerequisites, creating a Flutter project, installing dependencies, building the UI, integrating a voice recognition library, and building voice recognition in Flutter.

![flutter speech to text](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover8.jpg)
## Prerequisites

Before we begin, you should make sure you have the following installed:

- The [Flutter SDK](https:&#x2F;&#x2F;flutter.dev&#x2F;docs&#x2F;get-started&#x2F;install)
- An IDE (Android Studio, Visual Studio Code, IntelliJ IDEA, etc.)
- The [Android SDK](https:&#x2F;&#x2F;developer.android.com&#x2F;studio&#x2F;index.html)

Additionally, you should have a basic understanding of the Flutter framework and the Dart programming language.

## Creating a Flutter Project

First, we will set up a new Flutter project. Open your preferred IDE, and create a new Flutter project. When prompted, choose a name for your project and a location to save it.

Once the project is created, open the &#96;pubspec.yaml&#96; file and add the following dependencies:

&#96;&#96;&#96;yaml
dependencies:
  flutter:
    sdk: flutter
  
  speech_to_text: ^0.3.0
&#96;&#96;&#96;

Save the file and run &#96;flutter pub get&#96; to install the dependencies.

## Installing Dependencies

Next, we need to install the speech_to_text package. To do this, open a terminal window and run the following command:

&#96;&#96;&#96;sh
flutter pub get
&#96;&#96;&#96;

This will install the package in your project.

## Building the UI

Now, we will create the UI for our app. Open the &#96;main.dart&#96; file and add the following code:

&#96;&#96;&#96;dart
import &#x27;package:flutter&#x2F;material.dart&#x27;;

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: &#x27;Speech to Text App&#x27;,
      home: Scaffold(
        appBar: AppBar(
          title: Text(&#x27;Speech to Text App&#x27;),
        ),
        body: Center(
          child: Text(&#x27;Speech to Text App&#x27;),
        ),
      ),
    );
  }
}
&#96;&#96;&#96;

This will create the basic UI for our app.

## Integrating a Voice Recognition Library

Next, we need to integrate the speech_to_text package into our project. To do this, open the &#96;main.dart&#96; file and add the following code:

&#96;&#96;&#96;dart
import &#x27;package:speech_to_text&#x2F;speech_recognition.dart&#x27;;
&#96;&#96;&#96;

This will import the speech_to_text package into our project.

## Building Voice Recognition in Flutter

Finally, we need to add the code to enable voice recognition. To do this, open the &#96;main.dart&#96; file and add the following code:

&#96;&#96;&#96;dart
import &#x27;package:speech_to_text&#x2F;speech_recognition.dart&#x27;;

&#x2F;&#x2F; ...

class MyApp extends StatelessWidget {
  &#x2F;&#x2F; ...

  @override
  Widget build(BuildContext context) {
    &#x2F;&#x2F; ...

    return MaterialApp(
      title: &#x27;Speech to Text App&#x27;,
      home: Scaffold(
        appBar: AppBar(
          title: Text(&#x27;Speech to Text App&#x27;),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: &lt;Widget&gt;[
              Text(&#x27;Speech to Text App&#x27;),
              SpeechRecognitionWidget(),
            ],
          ),
        ),
      ),
    );
  }
}

class SpeechRecognitionWidget extends StatefulWidget {
  @override
  _SpeechRecognitionWidgetState createState() =&gt; _SpeechRecognitionWidgetState();
}

class _SpeechRecognitionWidgetState extends State&lt;SpeechRecognitionWidget&gt; {
  SpeechRecognition _speech;

  bool _speechRecognitionAvailable = false;
  bool _isListening = false;

  String transcription = &#x27;&#x27;;

  @override
  void initState() {
    super.initState();
    activateSpeechRecognizer();
  }

  &#x2F;&#x2F; Platform messages are asynchronous, so we initialize in an async method.
  void activateSpeechRecognizer() {
    _speech = new SpeechRecognition();
    _speech.setAvailabilityHandler(onSpeechAvailability);
    _speech.setCurrentLocaleHandler(onCurrentLocale);
    _speech.setRecognitionStartedHandler(onRecognitionStarted);
    _speech.setRecognitionResultHandler(onRecognitionResult);
    _speech.setRecognitionCompleteHandler(onRecognitionComplete);
    _speech
        .activate()
        .then((res) =&gt; setState(() =&gt; _speechRecognitionAvailable = res));
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: MediaQuery.of(context).size.width * 0.7,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: &lt;Widget&gt;[
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: &lt;Widget&gt;[
              FloatingActionButton(
                child: Icon(Icons.cancel),
                mini: true,
                backgroundColor: Colors.deepOrange,
                onPressed: _speechRecognitionAvailable &amp;&amp; _isListening
                    ? () =&gt; _speech.cancel()
                    : null,
              ),
              FloatingActionButton(
                child: Icon(Icons.mic),
                onPressed: _speechRecognitionAvailable &amp;&amp; !_isListening
                    ? () =&gt; start()
                    : null,
                backgroundColor: Colors.pink,
              ),
              FloatingActionButton(
                child: Icon(Icons.stop),
                mini: true,
                backgroundColor: Colors.deepPurple,
                onPressed: _speechRecognitionAvailable &amp;&amp; _isListening
                    ? () =&gt; stop()
                    : null,
              ),
            ],
          ),
          Container(
            width: MediaQuery.of(context).size.width * 0.7,
            decoration: BoxDecoration(
              color: Colors.cyanAccent[100],
              borderRadius: BorderRadius.circular(6.0),
            ),
            padding: EdgeInsets.symmetric(
              vertical: 8.0,
              horizontal: 12.0,
            ),
            child: Text(
              transcription,
              style: TextStyle(fontSize: 24.0),
            ),
          )
        ],
      ),
    );
  }

  void start() =&gt; _speech
      .listen(locale: &#x27;en_US&#x27;)
      .then((result) =&gt; print(&#x27;_MyAppState.start =&gt; result $result&#x27;));

  void stop() =&gt; _speech.stop().then((result) {
        setState(() =&gt; _isListening = result);
      });

  void onSpeechAvailability(bool result) =&gt;
      setState(() =&gt; _speechRecognitionAvailable = result);

  void onCurrentLocale(String locale) {
    print(&#x27;_MyAppState.onCurrentLocale... $locale&#x27;);
    setState(
        () =&gt; _currentLocale = locale);
  }

  void onRecognitionStarted() =&gt; setState(() =&gt; _isListening = true);

  void onRecognitionResult(String text) {
    setState(() =&gt; transcription = text);
  }

  void onRecognitionComplete() =&gt; setState(() =&gt; _isListening = false);
}
&#96;&#96;&#96;

This will enable voice recognition in our app.

## Conclusion

In this article, we explored how to create a Speech to Text dictation app in Flutter. We covered the prerequisites, creating a Flutter project, installing dependencies, building the UI, integrating a voice recognition library, and building voice recognition in Flutter. With the code provided in this article, you should be able to create your own Speech to Text dictation app in Flutter.

How to Build a Speech to Text Dictation App in Flutter

Biometrics authentication is a convenient way to validate user identity and provide secure access to applications. It is becoming increasingly popular in mobile apps due to the convenience and security it provides. In this article, we will look at how to implement biometrics authentication with Face ID and Fingerprint in Flutter.

![flutter biometrics face id](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover9.jpg)
## Prerequisites
Before getting started, you should have a basic understanding of Flutter and the concepts of authentication. Additionally, you will need to have the latest version of the Flutter SDK installed.

## Creating a Flutter Project
Let&#x27;s start by creating a new Flutter project. Open the terminal, navigate to a suitable directory, and enter the following command:

&#96;&#96;&#96;
flutter create biometrics_auth
&#96;&#96;&#96;

This will create a new Flutter project with the name &#96;biometrics_auth&#96;.

## Installing The Dependencies
Next, we need to install the &#96;local_auth&#96; package, which will enable us to use biometrics authentication in our Flutter app. To install it, open the &#96;pubspec.yaml&#96; file and add the following line:

&#96;&#96;&#96;
dependencies:
  local_auth: ^0.6.2
&#96;&#96;&#96;

Then, run the following command in the terminal to install the package:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

## Getting Face ID and Fingerprint Permissions in Flutter
We need to request permission from the user to use Face ID and Fingerprint authentication. To do this, we need to use the &#96;LocalAuthentication&#96; class, which is part of the &#96;local_auth&#96; package.

First, we need to create an instance of the &#96;LocalAuthentication&#96; class. We can do this by calling the &#96;LocalAuthentication.instance&#96; method:

&#96;&#96;&#96;dart
final localAuth = LocalAuthentication.instance;
&#96;&#96;&#96;

Next, we need to call the &#96;authenticateWithBiometrics&#96; method, which will prompt the user to provide permission to use Face ID or Fingerprint authentication. This method takes a &#96;BiometricAuthenticationRequest&#96; object as an argument, which we can create using the &#96;BiometricAuthenticationRequest.withProtectionLevel&#96; constructor:

&#96;&#96;&#96;dart
BiometricAuthenticationRequest request = 
  BiometricAuthenticationRequest.withProtectionLevel(
    BiometricProtectionLevel.encryption,
);

&#96;&#96;&#96;

The &#96;BiometricProtectionLevel.encryption&#96; argument specifies that the user data should be encrypted when stored on the device.

Finally, we can call the &#96;authenticateWithBiometrics&#96; method, passing in the &#96;request&#96; object:

&#96;&#96;&#96;dart
bool authenticated = 
  await localAuth.authenticateWithBiometrics(request);
&#96;&#96;&#96;

This method will return a boolean value indicating whether the user has granted permission to use Face ID or Fingerprint authentication.

## How to Use Biometrics in Flutter
Once we have permission to use biometrics authentication, we can use the &#96;authenticateWithBiometrics&#96; method to authenticate the user. This method takes a &#96;BiometricAuthenticationRequest&#96; object as an argument, which we can create using the &#96;BiometricAuthenticationRequest.withProtectionLevel&#96; constructor:

&#96;&#96;&#96;dart
BiometricAuthenticationRequest request = 
  BiometricAuthenticationRequest.withProtectionLevel(
    BiometricProtectionLevel.encryption,
);
&#96;&#96;&#96;

The &#96;BiometricProtectionLevel.encryption&#96; argument specifies that the user data should be encrypted when stored on the device.

Next, we can call the &#96;authenticateWithBiometrics&#96; method, passing in the &#96;request&#96; object:

&#96;&#96;&#96;dart
bool authenticated = 
  await localAuth.authenticateWithBiometrics(request);
&#96;&#96;&#96;

This method will return a boolean value indicating whether the user has been successfully authenticated.

## Conclusion
In this article, we looked at how to implement biometrics authentication with Face ID and Fingerprint in Flutter. We discussed the prerequisites and how to get permission from the user to use biometrics authentication. We also looked at how to authenticate the user with biometrics.

Biometrics Authentication with Face ID and Fingerprint in Flutter

Building a carousel in Flutter is an easy and straightforward process. Whether you&#x27;re a beginner or an advanced Flutter developer, you can quickly learn how to use the carousel_slider package to create a beautiful carousel in your app. In this article, we&#x27;ll walk you through the prerequisites, installation, and construction of a carousel in Flutter. We&#x27;ll also cover how to customize its appearance and handle carousel events. 

![flutter carousel](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover19.jpg)
## Prerequisites

To build a carousel in Flutter, you&#x27;ll need to have the following:

- Basic knowledge of the [Dart programming language](https:&#x2F;&#x2F;dart.dev&#x2F;guides&#x2F;language&#x2F;language-tour).
- The [Flutter SDK](https:&#x2F;&#x2F;flutter.dev&#x2F;docs&#x2F;get-started&#x2F;install) installed on your machine.

## Creating a Flutter Project

The first step in creating a carousel in Flutter is to create a new Flutter project. To do this, open the terminal and enter the following command:

&#96;&#96;&#96;
flutter create &lt;project name&gt;
&#96;&#96;&#96;

Replace &#96;&lt;project name&gt;&#96; with the name of the project. This will create a new Flutter project with the given name.

## Installing carousel_slider into Your Project

Once you have created the project, the next step is to install the carousel_slider package into your project. To do this, open the pubspec.yaml file and add the following line under dependencies:

&#96;&#96;&#96;
carousel_slider: ^1.4.1
&#96;&#96;&#96;

Save the file and run the following command in the terminal:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

This will install the carousel_slider package into your project.

## How to Build a Carousel in Flutter

Now that you have installed the carousel_slider package, you can start building the carousel. To do this, open the main.dart file and import the carousel_slider package:

&#96;&#96;&#96;dart
import &#x27;package:carousel_slider&#x2F;carousel_slider.dart&#x27;;
&#96;&#96;&#96;

Next, create a list of images that you want to display in the carousel:

&#96;&#96;&#96;dart
List&lt;String&gt; imageList = [
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1520342868574-5fa3804e551c?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=6ff92caffcdd63681a35134a6770ed3b&amp;auto=format&amp;fit=crop&amp;w=1951&amp;q=80&#x27;,
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1522205408450-add114ad53fe?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=368f45b0888aeb0b7b08e3a1084d3ede&amp;auto=format&amp;fit=crop&amp;w=1950&amp;q=80&#x27;,
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1519125323398-675f0ddb6308?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=94a1e718d89ca60a6337a6008341ca50&amp;auto=format&amp;fit=crop&amp;w=1950&amp;q=80&#x27;,
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1523205771623-e0faa4d2813d?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=89719a0d55dd05e2deae4120227e6efc&amp;auto=format&amp;fit=crop&amp;w=1953&amp;q=80&#x27;,
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1508704019882-f9cf40e475b4?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=8c6e5e3aba713b17aa1fe71ab4f0ae5b&amp;auto=format&amp;fit=crop&amp;w=1352&amp;q=80&#x27;,
  &#x27;https:&#x2F;&#x2F;images.unsplash.com&#x2F;photo-1519985176271-adb1088fa94c?ixlib=rb-0.3.5&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;s=a0c8d632e977f94e5d312d9893258f59&amp;auto=format&amp;fit=crop&amp;w=1355&amp;q=80&#x27;
];
&#96;&#96;&#96;

Now, you can create the carousel widget in the build() method:

&#96;&#96;&#96;dart
CarouselSlider(
  items: imageList.map((item) =&gt; Container(
    child: ClipRRect(
      borderRadius: BorderRadius.all(Radius.circular(5.0)),
      child: Image.network(item, fit: BoxFit.cover),
    ),
  )).toList(),
  autoPlay: true,
  aspectRatio: 2.0,
  viewportFraction: 0.8,
)
&#96;&#96;&#96;

The above code will create a carousel that displays the images in the &#96;imageList&#96; array. The carousel will automatically play the images in an infinite loop. 

## Customizing the Carousel&#x27;s Appearance

The carousel_slider package provides several options to customize the carousel&#x27;s appearance. For example, you can change the aspect ratio, viewport fraction, and more. 

For example, you can set the aspect ratio to &#96;2.0&#96; and the viewport fraction to &#96;0.8&#96;, as shown in the example above. You can also set the autoPlay option to &#96;true&#96; or &#96;false&#96; to enable or disable the auto-play feature. 

In addition, you can also add additional options, such as the &#96;onPageChanged&#96; option, which is used to handle the carousel events.

## Handling Carousel Events

The carousel_slider package also provides a way to handle carousel events. The &#96;onPageChanged&#96; option is used to handle the carousel events. This option takes a callback function as an argument. The callback function is triggered whenever the carousel page is changed. 

For example, you can use the &#96;onPageChanged&#96; option to print the current page index in the console:

&#96;&#96;&#96;dart
onPageChanged: (index) {
  print(&#x27;Current Page Index: $index&#x27;);
},
&#96;&#96;&#96;

You can also use the &#96;onPageChanged&#96; option to perform certain actions when the carousel page is changed. 

## Conclusion

In this article, we have covered how to build a carousel in Flutter using the carousel_slider package. We have also discussed how to customize the carousel&#x27;s appearance and handle carousel events. With a few lines of code, you can easily create a beautiful carousel in your app.

How to Build a Carousel in Flutter

Dark mode support has become an increasingly popular feature for mobile applications. It allows users to customize the look and feel of their apps to match their own personal preferences. Flutter, Google&#x27;s open-source user interface (UI) toolkit, makes it easy to implement dark mode in your applications. In this article, we&#x27;ll discuss the prerequisites, how to create a Flutter project, handle different themes in Flutter, and how to support dark mode in Flutter.

![flutter dark mode](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover21.jpg)
## Prerequisites

Before you get started implementing dark mode support in your Flutter project, there are a few things you need to have in place. First, you&#x27;ll need to have the [Flutter SDK](https:&#x2F;&#x2F;flutter.dev&#x2F;docs&#x2F;get-started&#x2F;install) installed on your machine. Additionally, you&#x27;ll need to have an understanding of the [Material Design guidelines](https:&#x2F;&#x2F;material.io&#x2F;design&#x2F;material-theming&#x2F;overview.html). These guidelines will help you to create a consistent design across your application.

## Creating a Flutter Project

Once you have the prerequisites in place, you can create your Flutter project. To do this, open up a terminal window and run the following command:

&#96;&#96;&#96;
flutter create &lt;project_name&gt;
&#96;&#96;&#96;

This will create a new Flutter project with the given name in the current directory.

## Handling Different Themes in Flutter

Flutter provides a convenient way to handle different themes in your application. It uses a &#96;ThemeData&#96; class to define the colors and fonts used in the application. You can define multiple &#96;ThemeData&#96; objects, each representing a different theme. For example, you could create a &#96;lightTheme&#96; and a &#96;darkTheme&#96; object.

To switch between different themes, you can use the &#96;Theme.of(context).copyWith()&#96; method. This method takes a &#96;ThemeData&#96; object and returns a new &#96;ThemeData&#96; object with the given theme applied. You can then use this object to update the &#96;ThemeData&#96; object in your &#96;MaterialApp&#96;.

&#96;&#96;&#96;dart
&#x2F;&#x2F; Define the light and dark theme
final ThemeData lightTheme = ThemeData(
  brightness: Brightness.light,
  primaryColor: Colors.white,
  accentColor: Colors.blue,
);

final ThemeData darkTheme = ThemeData(
  brightness: Brightness.dark,
  primaryColor: Colors.black,
  accentColor: Colors.blue,
);

&#x2F;&#x2F; Update the theme in your MaterialApp
MaterialApp(
  theme: Theme.of(context).copyWith(
    brightness: Brightness.dark,
  ),
  home: MyHomePage(),
);
&#96;&#96;&#96;

## How to Support Dark Mode in Flutter

To support dark mode in your Flutter application, you&#x27;ll need to create a new &#96;ThemeData&#96; object for the dark theme. This object should define the colors and fonts that will be used when the user has enabled dark mode in their device settings.

Once you have defined the dark theme, you can use the &#96;Theme.of(context).copyWith()&#96; method to switch between the light and dark themes. You can also use the [&#96;MediaQuery.of(context).platformBrightness&#96;](https:&#x2F;&#x2F;api.flutter.dev&#x2F;flutter&#x2F;widgets&#x2F;MediaQuery&#x2F;platformBrightness.html) method to determine the device&#x27;s brightness and switch to the appropriate theme accordingly.

&#96;&#96;&#96;dart
&#x2F;&#x2F; Define the light and dark theme
final ThemeData lightTheme = ThemeData(
  brightness: Brightness.light,
  primaryColor: Colors.white,
  accentColor: Colors.blue,
);

final ThemeData darkTheme = ThemeData(
  brightness: Brightness.dark,
  primaryColor: Colors.black,
  accentColor: Colors.blue,
);

&#x2F;&#x2F; Update the theme based on the device&#x27;s brightness
MaterialApp(
  theme: Theme.of(context).copyWith(
    brightness: MediaQuery.of(context).platformBrightness,
  ),
  home: MyHomePage(),
);
&#96;&#96;&#96;

## Changing the Color Scheme

Once you have the dark mode theme configured, you can start customizing the colors in your application. You can use the [&#96;ThemeData.colorScheme&#96;](https:&#x2F;&#x2F;api.flutter.dev&#x2F;flutter&#x2F;material&#x2F;ThemeData&#x2F;colorScheme.html) property to define a custom color scheme for your application. This color scheme will be used to determine the colors used in the application when dark mode is enabled.

For example, you could define a &#96;ColorScheme&#96; object with a dark primary color, a light secondary color, and a dark accent color:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Define a custom color scheme
final ColorScheme colorScheme = ColorScheme(
  primary: Colors.black,
  secondary: Colors.white,
  accent: Colors.blue,
);

&#x2F;&#x2F; Update the theme with the custom color scheme
MaterialApp(
  theme: Theme.of(context).copyWith(
    colorScheme: colorScheme,
  ),
  home: MyHomePage(),
);
&#96;&#96;&#96;

## Saving the Color Scheme Preference

To make sure that the user&#x27;s color scheme preference is remembered, you can use the [&#96;SharedPreferences&#96;](https:&#x2F;&#x2F;pub.dev&#x2F;packages&#x2F;shared_preferences) package to save the user&#x27;s preference to the device. You can then use this preference to update the &#96;ThemeData&#96; when the application is launched.

For example, you could create a &#96;getColorScheme()&#96; method to retrieve the user&#x27;s color scheme preference:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Retrieve the user&#x27;s color scheme preference
Future&lt;ColorScheme&gt; getColorScheme() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  ColorScheme colorScheme = ColorScheme.fromJson(prefs.getString(&#x27;colorScheme&#x27;));
  return colorScheme;
}
&#96;&#96;&#96;

Then, you can use the &#96;getColorScheme()&#96; method to update the &#96;ThemeData&#96; when the application is launched:

&#96;&#96;&#96;dart
&#x2F;&#x2F; Update the theme with the user&#x27;s color scheme preference
MaterialApp(
  theme: Theme.of(context).copyWith(
    colorScheme: await getColorScheme(),
  ),
  home: MyHomePage(),
);
&#96;&#96;&#96;

## Conclusion

Dark mode support is an increasingly popular feature for mobile applications. Flutter makes it easy to implement dark mode in your applications with its powerful &#96;ThemeData&#96; and &#96;ColorScheme&#96; classes. With a few lines of code, you can make your application support dark mode and give your users the ability to customize the look and feel of your application.

Flutter

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How to Retrieve Device Info in Flutter

How to Build a Flutter File Picker

How to Use Google Directions API in Flutter

Data Storage in Flutter - Utimate Guide

Push Notifications in Flutter Using OneSignal

How to Build a Speech to Text Dictation App in Flutter

Biometrics Authentication with Face ID and Fingerprint in Flutter

How to Build a Carousel in Flutter

Dark Mode Support in Flutter

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