In this article, you are about to know An introduction to the Flutter, how it works and many other aspects of it. You will also learn about what are widgets and why they are so much important in the Flutter.
In this detail Introduction you will learn the following things:
- What is Flutter?
- Why We Should Use it?
- Main Features of Flutter
- What Is Dart Programming Language?
- How To Set Up Flutter?
- Flutter Project Structure
- What are Widgets In Flutter?
- Types Of Widgets In Flutter
What is Flutter?
It is an open-source framework and developed by Google.
Flutter defines it in the following words:
Flutter is a mobile app SDK for building high-performance, high-fidelity, apps for iOS and Android, from a single codebase.
Wikipedia says the following things about this as
Flutter is a new player in the codding ground but it has all the capabilities that are essential for any successful product. It has a very promising platform this is the reason that it has attracted so many large companies and these companies release their app with this Flutter platform.
Why We Should Use it?
Flutter is awesome because it’s less code and high performance. I am a great supporter of using this because of the following reasons.
- It has one code base for using on both iOS and Android
- Apps look really awesome in respect of design and feasibility.
- It has a feature called Hot-Reload means if you make any change in flutter code it reflects it in the main application in a blink of an eye.
- Quickly prototyping the application is possible with it.
- Flutter can be helpful in creating beautiful, easy to use and highly extendable and highly-customization mobile application with the Material Design set and iOS flavor.
Main Features Of Flutter
Flutter leads the battlegrounds with its competitors because of its following main features.
Flutter Doesn’t Use Native UI Components
This may seem confusing but because it draws every pixel of graphics by itself so, there is no need for any communication layer between the view and actual code.
All the UI elements like buttons, text, and all media elements are drawn by Flutter’s graphic engine. That is the reason for its great speed with smartphones.
Flutter has an awesome feature called “Hot Reload”. The function of this feature is to run application faster and moreover if you made any changes in the code and hit preview this feature allows you to quickly see your changes even in less than a second.
This functionality actually helps a developer to develop applications faster and removes bugs easily and efficiently.
What is Dart Language?
Dart Language is much similar to Python Programming in terms of when we talk about the ease of code and while keeping the power of native Java Language code.
How To Set Up Flutter?
In this guide, we will cover the complete process of how to set up the Flutter for our operating system.
Flutter Project Structure
Whenever we have created a Flutter project it has created other supporting files as well which will help in different ways.
In this guide, we will see what are these files and what functionalities are performed.
lib: is the first and main file that is created. It is the file in which all of our code lies. It is also called as Dart’s package manager.
Pubspec.yml: It stores a complete list of packages that is essential and important to use for the application to run. One thing that you should remember is that you are not allowed to use the pub directly, but instead, you should use a command as “flutter pub get <package_name>.
test: This file is for testing the files or applications. You can run them via a run command.
iOS/ & android: It is code specific means it uses as per your OS(Operating System). All the icons and settings have adjusted automatically like access to location and Bluetooth etc.
There are other files also but the most important one is the lib file because it contains the main.dart file that contains all of our code. You can say that main.dart is the entry point for executing the application just like in C++ the entry point is the main() function.
What are Widgets In Flutter?
Flutter is all about widgets. It is really an important thing to understand that in this every application that you build is a combination of different kinds of widgets. Widgets are the basic building blocks for your application.
Types of Widgets In Flutter
There are two primary types of widgets in a flutter. These two widgets allow us to create our own widgets. Let’s discuss to learn more about these Widgets.
- Stateless Widgets
- Stateful Widgets
Flutter Stateless Widgets
Stateless widgets are widgets that do not require any mutable state. By state, it means two types of information.
- The information that is readable synchronously when the widget is built.
- Information that continues changes during the life cycle of the widget
Stateless widget designs the UI (User Interface) by combining the other useful widgets that can be helpful in describing different elements of the user interface.
A stateless widget continues to mixing up these concrete widgets until the description of the user interface completes.
Flutter Stateful Widgets
Widgets that have a mutable state is called Stateful Widgets.
In contrast to the Stateless widgets, the Stateful widgets are very useful in case when we are describing our user interface or part of it that changes dynamically for reasons as having a clock-driven state management system or depending on some other state system.
The Stateful widget keeps its state the same while moving from one location to another in the widget tree. These widgets do not exist by themselves but they require an extra to store the state information for the widget.