Flutter series of articles-The application of Flutter in actual business

Solutions for different scenarios

1. Cross-platform development: In mobile application development, facing different platforms (iOS and Android), we usually need to write two different sets of code. Flutter can build applications for multiple platforms through a set of codes, which greatly improves development efficiency and reduces maintenance costs.

2. Hybrid development: In some existing native applications, Flutter can be introduced to develop certain specific modules to achieve hybrid development. This enables the introduction of Flutter's high-performance, rich UI components without rewriting the entire application.

3. New project development: For brand-new projects, Flutter provides a complete development framework to build applications from scratch. This provides developers with greater flexibility to design architecture and implementation based on project needs.

Flutter’s business architecture model

1. BLoC mode: BLoC mode separates business logic and interface logic and uses Stream for state management, thereby making the code more maintainable and testable. Send input events to BLoC through Sink, and then update the UI through StreamBuilder or Provider.

2. Provider mode: Provider is a lightweight state management solution suitable for small to medium-sized applications. It implements state sharing in the widget tree through InheritedWidget and monitors state changes through ChangeNotifier.

3. Riverpod mode: Riverpod is an enhanced version of Provider, providing more powerful dependency injection and state management functions. It supports features such as lazy loading, asynchronous and scope, and can better manage complex state logic.

Continuous integration and automated testing

1. GitHub Actions: GitHub Actions is a continuous integration tool built into GitHub, which can automatically trigger building, running tests and deploying applications after code submission. By defining workflows, you can ensure the stability and quality of your code.

2. Travis CI: Similar to GitHub Actions, Travis CI is also a widely used continuous integration tool. By defining tasks in configuration files, it can automatically run tests after every commit to ensure code quality.

Flutter application monitoring and data reporting

1. Sentry: Sentry is a powerful application error monitoring platform that can automatically capture errors and exceptions in applications, including crashes and performance issues. It provides detailed error information, stack traces, and context to help developers quickly locate and fix problems.

2. Firebase Analytics: Firebase provides a set of app analytics tools for tracking user behavior, app usage, and performance metrics. You can learn about user activity, retention rates, and app load time and performance data.

Example Demo: Flutter application in actual business scenarios

Scenario: Cross-platform music player

In this example, we will develop a cross-platform music player application. We will show in detail how to use Flutter solutions in different scenarios, and how to apply business architecture models, continuous integration, automated testing and application monitoring.

Function:

• Play music, pause, stop
• Display currently playing song information
• List shows song list
• Music playback status management

import 'package:flutter/material.dart';

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

class MusicPlayerApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Music Player',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MusicPlayerScreen(),
    );
  }
}

class MusicPlayerScreen extends StatefulWidget {
  @override
  _MusicPlayerScreenState createState() => _MusicPlayerScreenState();
}

class _MusicPlayerScreenState extends State<MusicPlayerScreen> {
  bool _isPlaying = false;
  String _currentSong = 'Song Title';

  void _togglePlay() {
    setState(() {
      _isPlaying = !_isPlaying;
    });
  }

  void _changeSong(String songTitle) {
    setState(() {
      _currentSong = songTitle;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Music Player')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Now Playing: $_currentSong'),
            IconButton(
              icon: Icon(_isPlaying ? Icons.pause : Icons.play_arrow),
              onPressed: _togglePlay,
            ),
            SongList(onSongChange: _changeSong),
          ],
        ),
      ),
    );
  }
}

class SongList extends StatelessWidget {
  final Function(String) onSongChange;

  SongList({required this.onSongChange});

  @override
  Widget build(BuildContext context) {
    return ListView(
      shrinkWrap: true,
      children: [
        ListTile(
          title: Text('Song 1'),
          onTap: () => onSongChange('Song 1'),
        ),
        ListTile(
          title: Text('Song 2'),
          onTap: () => onSongChange('Song 2'),
        ),
        // ... More song items
      ],
    );
  }
}

This example will include detailed code and explanations of how to use different Flutter features to achieve these functions.

Through this example, you will have a deeper understanding of how to apply Flutter in actual business, and how to use different solutions and technologies to build efficient and stable applications.