Building a Todo/CRUD Application In Flutter With Redux - Part 1

Repository

https://github.com/flutter/flutter

What Will I Learn?

• You will learn how to use Redux in Flutter
• You will learn about Actions and Reducers
• You will learn how to properly use Immutable state
• You will learn about View-Models in Redux
• You will learn how to make handlers and callbacks to call to your store and reducers
• You will learn how to properly structure a Redux application in a Modular way

Requirements

System Requirements:

• IDEA intellij, Visual Studio Code with the Dart/Flutter Plugins, Android Studio or Xcode
• The Flutter SDK on the latest Master Build
• An Android or iOS Emulator or device for testing

OS Support for Flutter:

• Windows 7 SP1 or later (64-bit)
• macOS (64-bit)
• Linux (64-bit)

Required Knowledge

• A basic knowledge of state and state management
• A fair understanding of Mobile development and Imperative or Object Oriented Programming
• Basic knowledge of CRUD

Resources for Flutter and this Project:

• Flutter Website: https://flutter.io/
• Flutter Official Documentation: https://flutter.io/docs/
• Flutter Installation Information: https://flutter.io/get-started/install/
• Flutter GitHub repository: https://github.com/flutter/flutter
• Flutter Dart 2 Information: https://github.com/flutter/flutter/wiki/Trying-the-preview-of-Dart-2-in-Flutter
• Flutter Technical Overview: https://flutter.io/technical-overview/
• Dart Website: https://www.dartlang.org/
• Flutter Awesome GitHub Repository: https://github.com/Solido/awesome-flutter

Sources:

Flutter Logo (Google): https://flutter.io/

Difficulty

• Intermediate

Outline and Overview

In this Flutter Tutorial, we revisit the Flutter Redux library to fully flesh out the concepts and abstractions. In the original Flutter Redux tutorial, found here, the application was much smaller and only had a single action which gave the user the ability to add items to a small list. In this tutorial, we rebuild our application in a much more idiomatic and modular way so that we can expand upon it with middleware, thunks, and epics in the coming videos.

We add multiple actions which gives the application much more functionality; the user now has the ability to remove items either one at a time or all at once. This also means that the reducer used to create this application is more complex which will lead into the ability to talk about combined reducers and typed reducers. The tutorial spends more time explaining the concepts to properly setup the expanded abstractions which will be demoed in this series.

Description

Revisiting Redux - A General Overview of Redux in Flutter

The Redux pattern is a design pattern that was originally introduced by developers over at facebook. It is an extension of the already popular and powerful state management concepts introduced in Flux. Flutter follows a similar structure to React which makes the Redux pattern an obvious choice for managing state in a Flutter application.

Redux follows three simple tenets which have fairly far reaching implications:

• There is a single source of truth; in other words, your application state is kept in a single place called a store.
• The application state must be read only. When you change the state of your application, you create new state rather than mutate old state.
• These state changes committed through pure functions or functions with no side effects.

By constraining how we write the logic for our application using these ideas, we gain quite a lot of control over our application's state. Gaining this type of control over our state also leads to a more cleanly structured code-base. The pure reducer functions are also easier to test then non-pure logic functions. All of these benefits make Redux well suited for larger more complex applications.

The above image highlights the main reducer used in this stage of our application. This reducer is responsible for adding and removing our items based on the action dispatched to the store. The reducer is pure and predictable which makes debugging and testing fairly simple.

The Redux Circle of Application Life

Any Redux application follows a specific pattern which makes reading the code and working with the code fairly predictable. The user interacts with the UI through a ViewModel and this ViewModel then dispatches an Action to a Reducer. The Reducer then follows the action and decides how the store will change the state. The store then updates the UI with the new ViewModel that it generates and then this process repeats. With more complex applications, another step is added before the Action is pushed to the Reducer in the form of middleware. Middleware is required when you want to have a side effecting behavior in our application. Middleware handles state persistence, calling APIs, dispatching data to other systems and other behaviors that occur outside of the system.

Above you can see the simple version of the Redux circle that we are using in this particular application at the moment. As we add more features and behavior to our application, we will also be adding middleware to this graph.

The source code for this project can be found here

Video Tutorial

Related Videos

• Building a List in Redux with Dart's Flutter Framework

Projects and Series

Stand Alone Projects:

• Dart Flutter Cross Platform Chat Application Tutorial
• Building a Temperature Conversion Application using Dart's Flutter Framework
• Managing State with Flutter Flux and Building a Crypto Tracker Application with Dart's Flutter Framework

Building a Calculator

• Building a Calculator Layout using Dart's Flutter Framework
• Finishing our Calculator Application with Dart's Flutter Framework

Movie Searcher Application

• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 1)
• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 2)
• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 3, Final)

Minesweeper Game

• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 1)
• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 2)
• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 3)
• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 4, Final)

Weather Application

• Building a Weather Application with Dart's Flutter Framework (Part 1, Handling Complex JSON with Built Code Generation)
• Building a Weather Application with Dart's Flutter Framework (Part 2, Creating a Repository and Model)
• Building a Weather Application with Dart's Flutter Framework (Part 3, RxCommand (RxDart) and Adding an Inherited Widget)
• Building a Weather Application with Dart's Flutter Framework (Part 4, Using RxWidget to Build a Reactive User Interface)
• Localize and Internationalize Applications with Intl and the Flutter SDK in Dart's Flutter Framework

Curriculum

• Building a Multi-Page Application with Dart's Flutter Mobile Framework
• Making Http requests and Using Json in Dart's Flutter Framework
• Building Dynamic Lists with Streams in Dart's Flutter Framework
• Using GridView, Tabs, and Steppers in Dart's Flutter Framework
• Using Global Keys to get State and Validate Input in Dart's Flutter Framework
• The Basics of Animation with Dart's Flutter Framework
• Advanced Physics Based Animations in Dart's Flutter Framework
• Building a Drag and Drop Application with Dart's Flutter Framework
• Building a Hero Animation and an Application Drawer in Dart's Flutter Framework
• Using Inherited Widgets and Gesture Detectors in Dart's Flutter Framework
• Using Gradients, Fractional Offsets, Page Views and Other Widgets in Dart's Flutter Framework
• Making use of Shared Preferences, Flex Widgets and Dismissibles with Dart's Flutter framework
• Using the Different Style Widgets and Properties in Dart's Flutter Framework
• Composing Animations and Chaining Animations in Dart's Flutter Framework
• Building a Countdown Timer with a Custom Painter and Animations in Dart's Flutter Framework
• Reading and Writing Data and Files with Path Provider using Dart's Flutter Framework
• Exploring Webviews and the Url Launcher Plugin in Dart's Flutter Framework
• Adding a Real-time Database to a Flutter application with Firebase
• Managing State with the Scoped Model Pattern in Dart's Flutter Framework
• Authenticating Guest Users for Firebase using Dart's Flutter Framework
• How to Monetize Your Flutter Applications Using Admob
• Using Geolocator to Communicate with the GPS and Build a Map in Dart's Flutter Framework
• Managing the App Life Cycle and the Screen Orientation in Dart's Flutter Framework
• Making use of General Utility Libraries for Dart's Flutter Framework
• Interfacing with Websockets and Streams in Dart's Flutter Framework
• Playing Local, Network and YouTube Videos with the Video Player Plugin in Dart's Flutter Framework
• Building Custom Scroll Physics and Simulations with Dart's Flutter Framework
• Making Dynamic Layouts with Slivers in Dart's Flutter Framework
• Building a Sketch Application by using Custom Painters in Dart's Flutter Framework
• Using Dart Isolates, Dependency Injection and Future Builders in Dart's Flutter Framework
• Looking at the Main Features of the Beta Three Release of Dart's Flutter Framework

Proof of Work Done

https://github.com/tensor-programming