Google Flutter is one of the well-known platforms to build high performing mobile applications suitable for multiple applications. Here is the blog on everything you should know about Flutter and Flutter architecture as a beginner. Let’s begin with the technical introduction to Flutter.

What is Flutter?

“Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase.” – Flutter.Dev

Flutter is a modern open-source framework which uses “Dart Language”.

Why Flutter?

High-Speed Development and Animation .

UI Elements.

Native apps for both Android & IOS.

Hot Reload(For every-time, if Save button clicked).

Performance has high.

Dart is Perfect For Multiple Languages .

Productivity .

Single Language For Layout And Backend .

The Customizable kit of Widgets.

What makes Flutter unique?

Compiles to ARM Binary code,

No reliance on OEM widgets,

No bridge needed,

Only Dart, no markup language.

Native vs Hybrid vs Cross-Platform

Native Hybrid Cross-Platform Language Kotlin, Java, Swift, Objective C HTML, Css,or Javascript Javascript Performance High Performance Low Performance Equivalent Performance Compilation No compilation Webview wrapper Compiles to native UI Components Native Limited Numerous Development cost High for two platforms Low for two platforms Single investment for two platforms

Native Approach

Hybrid Approach

Cross-Platform Approach

Flutter Approach

The comparison between Flutter and React Native

Flutter Vs React Native

FLUTTER REACT NATIVE Compiled to ARM C/C++ Library Compile to native code. Its compilation directly communicates with the native components. Communication, speed, and performance is better than React Native The communication occurs through the so-called bridge which communicates with native components. This affects the speed and performance fo the App. It has more pre-built libraries for mobile platforms. So, we can achieve most customization of UI elements It has only limited pre-built libraries, so we have a few limitations for UI customization Same components for all platforms In some cases, we need to use different components for different platforms like Android and iOS. As Dart was developed by Google, it covers all native related APIs. If some features are not working in Flutter, we can use native codes like Kotlin for android and Swift for iOS. As it is not invented for mobile development, some APIs of React does not work in a few native versions and you can't use native codes in such cases

Flutter Architecture

Widgets

Widgets act as the basic building block that helps you to build the user interface of flutter mobile application.

Stateless Widget

Stateless Widget is an immutable widget which doesn’t know anything. This gets render only once, or when the parent widget changes the configuration.

Stateful Widget

Stateful Widget is a mutable widget which has its own properties knowing as state and it can be changed by user input or by using SetState.

Flutter Layouts

As already said everything is widgets in Flutter. So, the layout models of Flutter are also widgets. You can create UI components and layouts with simple programs without needing a Graphical User Interface builder, Xml or Html.

Types of Layouts:

Single widget – Center, Container, etc.

Multiple widgets – Row, Column, Stack, Grid and List.

Flutter App Life Cycle

When it comes to Flutter App life cycle, one can represent it easily through the following image.

Project Structure in Flutter

(1.)We have separate directories from this project structure for “Android and IOS” containing all their respective files.

(2.)If we want to implement these(android&IOS) platforms, we can do it by entering these directories.

(3.)Find the default “.gitignore” file which contains a list of files, extensions and folders that need to be ignored when working with Git.

(4.)Git is a control system for tracking every change in source code during software development.

Flutter ‘Hello World’

import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Welcome to Flutter', home: Scaffold( appBar: AppBar( title: Text('Welcome to Flutter'), ), body: Center( child: Text('Hello World'), ), ), ); } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 import 'package:flutter/material.dart' ; void main ( ) = > runApp ( MyApp ( ) ) ; class MyApp extends StatelessWidget { @ override Widget build ( BuildContext context ) { return MaterialApp ( title : 'Welcome to Flutter' , home : Scaffold ( appBar : AppBar ( title : Text ( 'Welcome to Flutter' ) , ) , body : Center ( child : Text ( 'Hello World' ) , ) , ) , ) ; } }

Flutter Navigations

Navigator.push() //Within the ‘FirstRoute widget onPressed:() { Navigator.push( Context, MaterialPageRoute(builder: (context) => SecondRoute()),); } Navigator.pop() //Within the SecondRoute widget onPressed:() { Navigator.pop(context); } 1 2 3 4 5 6 7 8 9 10 11 12 Navigator . push ( ) //Within the ‘FirstRoute widget onPressed : ( ) { Navigator . push ( Context , MaterialPageRoute ( builder : ( context ) = > SecondRoute ( ) ) , ) ; } Navigator . pop ( ) //Within the SecondRoute widget onPressed : ( ) { Navigator . pop ( context ) ; }

Beautiful Animations

Flutter supports many types of Animations

Tween

Hero

Silver

Transform

FadeinWidget

Animation Builder

Animated Opacity

Physics-based animation

Dart Programming

Dart is an open-source, object-oriented and general-purpose programming language. It is a client-optimized language for fast apps on any platform! (Web – Desktop – Mobile – Embedded)

Language and Libraries

Packages manager https://pub.dev

Virtual machine

Compile to javascript dart2js

Compiler technology

Dart Native

Dart Web

This is the essential basics that you should be knowing about flutter as a beginner. If you have any doubts or require expertise from the best flutter developers or mobile application developers, Don’t hesitate to call us.

References

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