Introduction

In Flutter, a progress indicator or loading spinner is a valuable UI component that indicates ongoing background tasks. It helps users understand that the app is working and provides a visual cue to avoid the perception of freezing. This tutorial will guide you through the process of adding a progress indicator or loading spinner to your Flutter app, improving its user experience.

Content

To add a progress indicator or loading spinner in Flutter, follow these steps:

Step 1. Create a new Flutter project:

Before getting started, ensure that you have Flutter installed on your machine. Open your terminal and run the following command to create a new Flutter project:

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flutter create progress_indicator_app

Read more"Explore Flutter Widgets to Create Cross-Platform Apps"

Step 2. Implement the Progress Indicator Widget:

Navigate to the lib folder of your newly created Flutter project and open the main.dart file. Replace the existing code with the following implementation:

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import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _isLoading = false;

  void _startLoading() {
    setState(() {
      _isLoading = true;
    });

    // Simulating a background task
    Future.delayed(Duration(seconds: 3), () {
      setState(() {
        _isLoading = false;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Progress Indicator',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Progress Indicator'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              ElevatedButton(
                onPressed: _startLoading,
                child: Text('Start Loading'),
              ),
              SizedBox(height: 20.0),
              if (_isLoading)
                CircularProgressIndicator()
              else
                Text('Press the button to start loading.'),
            ],
          ),
        ),
      ),
    );
  }
}

In this code snippet, we define a Flutter app that contains a button to initiate the loading process. The _isLoading variable determines whether the loading spinner or a text widget is displayed. We simulate a background task using the Future.delayed method to update the loading state.

Step 3. Run the App:

Save the changes made to the main.dart file and execute the following command in your terminal to run the app:

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flutter run

Sample Code:

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import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Loading Spinner Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: LoadingScreen(),
    );
  }
}

class LoadingScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Loading Spinner'),
      ),
      body: Center(
        child: CircularProgressIndicator(
          strokeWidth: 7,
        ), // Display the circular progress indicator
      ),
    );
  }
}

Output:

Conclusion:

Congratulations! You have successfully added a progress indicator or loading spinner to your Flutter app. By following this tutorial, you learned how to create a Flutter project, implement the progress indicator widget, and manage the loading state. Enhance your app’s user experience by incorporating visual indicators that provide feedback during background tasks.
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