What is Flutter?

img

Flutter is a powerful yet flexible user interface SDK (software development kit) for creating natively compiled applications using a single code base. The kit is developed by Google and improved by the worldwide application developer community. The technology stack is built with Dart, C, C++, and a 2D rendering Skia engine. Flutter is great at building fast native apps for nearly all modern software platforms, like iOS, Android, Windows, Mac, and Linux. The official Flutter website hosted by Google is flutter.dev where any enthusiast can commit their development efforts to. As a free and open-source SDK, Flutter works perfect with the existing source code. This portable UI toolkit provides app developers with every tool for creating high performance applications of any type, including desktop apps, mobile apps, and web apps.

img

When was Flutter released?

img
img

The first steps for presenting the idea of a new UI toolkit were make by Google during software developer summits starting from 2015. The first version of Flutter was slated to work on Android only. The next technology advancements resulted in its first alpha release in 2017. Since then, Flutter has acquired lots of competitive features and gained a widespread support from the global community. App developers encouraged by the Google team contribute greatly to its overall development while creating comprehensive guidelines and documentation for newcomers, and sharing hands-on coding examples in the Flutter codelabs. The latest Flutter 1.22 version was released in October 2020 and brought many updates and feature improvements.

Flutter architecture: Overview

img

Flutter allows app developers for a highly productive open-source development model. What makes Flutter a unique UI SDK for building native mobile, web and desktop apps is its architectural characteristics. Flutter has an extensible and layered architectural system. It gives app dev teams full control over every single pixel while enabling them to unrestrictedly animate and overlay text, graphics, controls, and videos.

img

Flutter architectural model: Key components

img

Framework

Written in the Dart multi-platform programming language for apps, Flutter provides access to its functionality for app developers via the framework. Due to its layered architectural specifics, Flutter has a number of optional replaceable layers followed by a set of independent libraries.

1

Material

This library with a rich gallery enables app developers to enhance UI with multiple Material Design components, like themes, color styles, typography, shape styles, padding, scaffold, app bars, navigation bars, dialog boxes, menus, etc.

2

Cupertino

A platform-specific library providing a wide collection of Flutter widgets used to create iOS apps. The Cupertino package allows app developers to leverage the power of Flutter to implement iOS native applications for iOS design language.

3

Widgets

A set of widely used widgets common to Flutter app development practices. While enabling a reactive programming model at the widget layer, app developers can specify reusable class variations, like Animation, Baseline, ColorFilter, TextSpan, etc.

4

Rendering

This layer enables using the RenderObject functionality, and defines layouts and painting through the classes of RenderBox, PaintingBinding and others. All the renderable objects are therefore presented in the form of a tree allowing for dynamic object manipulation and adjustment. The tree layout adjusts automatically according to all the modifications done with render objects during app development.

5

Animation

The library provides Flutter-backed applications with basic and enhanced animations giving great user experiences. Animation objects in Flutter comprise classes, like AnimationController, TrainHoppinAnimation, Curves, ColorTween, etc. All these define how implemented animations should work within a single layer and across the whole app.

6

Painting

The painting library used in Flutter is designed to paint multiple objects for the app’ UI, like shapes and texts. Working with CustomPaint, CanvasTouchDetector, and ShapePainter classes let Flutter app developers leverage the benefits of low-level graphics. The library helps draw and interact with each drawing, create custom borders and shadows, etc.

7

Gestures

A library that helps recognize app users’ actions, like dragging, tapping, and scaling gestures. The interaction design is enabled via the GestureDetector widget. Once implemented, it can tell double taps from long presses, and vertical from horizontal drags. Adding gestures callbacks to trigger scrolling is another thing to do on this layer.

8

Foundation

This is a set of the most frequently used basic functions and classes, usually employed as indispensable primitives for higher level classes on various Flutter layers. The library includes such generic classes as Category, ErrorDescription, LocalKey, TextTreeRenderer, Unicode, and WriteBuffer. The Foundation package is also used to build APIs that interact with the Flutter engine.

img

Engine

Flutter utilizes its own engine constructed with the help of C++ programming language. Using the Flutter Engine lies at the very core of all the app developers’ workflows aimed at creating native app interfaces, especially on a low-level. While being portable, this runtime environment ensures fast rendering times for applications, and provides support for wrapper classes, like inputs, text, and graphics.

img

Embedder

Embedding software is a Flutter integration enabler that helps craft pixel-perfect native apps for every platform required. This middleware used in Flutter to ensure great app UI creation is not all the same. Being platform-specific, the embedder may vary depending on what platform an application is supposed to run. Given the platform, these embedders can be written in C++, Objective-C, or Java.

1

Material

This library with a rich gallery enables app developers to enhance UI with multiple Material Design components, like themes, color styles, typography, shape styles, padding, scaffold, app bars, navigation bars, dialog boxes, menus, etc.

3

Widgets

A set of widely used widgets common to Flutter app development practices. While enabling a reactive programming model at the widget layer, app developers can specify reusable class variations, like Animation, Baseline, ColorFilter, TextSpan, etc.

5

Animation

The library provides Flutter-backed applications with basic and enhanced animations giving great user experiences. Animation objects in Flutter comprise classes, like AnimationController, TrainHoppinAnimation, Curves, ColorTween, etc. All these define how implemented animations should work within a single layer and across the whole app.

7

Gestures

A library that helps recognize app users’ actions, like dragging, tapping, and scaling gestures. The interaction design is enabled via the GestureDetector widget. Once implemented, it can tell double taps from long presses, and vertical from horizontal drags. Adding gestures callbacks to trigger scrolling is another thing to do on this layer.

img

Engine

Flutter utilizes its own engine constructed with the help of C++ programming language. Using the Flutter Engine lies at the very core of all the app developers’ workflows aimed at creating native app interfaces, especially on a low-level. While being portable, this runtime environment ensures fast rendering times for applications, and provides support for wrapper classes, like inputs, text, and graphics.

2

Cupertino

A platform-specific library providing a wide collection of Flutter widgets used to create iOS apps. The Cupertino package allows app developers to leverage the power of Flutter to implement iOS native applications for iOS design language.

4

Rendering

This layer enables using the RenderObject functionality, and defines layouts and painting through the classes of RenderBox, PaintingBinding and others. All the renderable objects are therefore presented in the form of a tree allowing for dynamic object manipulation and adjustment. The tree layout adjusts automatically according to all the modifications done with render objects during app development.

6

Painting

The painting library used in Flutter is designed to paint multiple objects for the app’ UI, like shapes and texts. Working with CustomPaint, CanvasTouchDetector, and ShapePainter classes let Flutter app developers leverage the benefits of low-level graphics. The library helps draw and interact with each drawing, create custom borders and shadows, etc.

8

Foundation

This is a set of the most frequently used basic functions and classes, usually employed as indispensable primitives for higher level classes on various Flutter layers. The library includes such generic classes as Category, ErrorDescription, LocalKey, TextTreeRenderer, Unicode, and WriteBuffer. The Foundation package is also used to build APIs that interact with the Flutter engine.

img

Embedder

Embedding software is a Flutter integration enabler that helps craft pixel-perfect native apps for every platform required. This middleware used in Flutter to ensure great app UI creation is not all the same. Being platform-specific, the embedder may vary depending on what platform an application is supposed to run. Given the platform, these embedders can be written in C++, Objective-C, or Java.

Flutter SDK features: What is inside?

img

The Flutter software development kit enjoys a wide range of advantageous features that make it a win-win choice for both app developers and business app owners.

  • The Skia 2D graphics library optimized for software and hardware tasks that serves as a mobile-first graphics for Flutter as well as Google Chrome, Mozilla, Firefox, Android, and other platforms.
  • Single UI and business logic toolkit for all the platforms.
  • Native app development with high performance and scalability
  • Ability to integrate Flutter functionality into the apps that already exist
  • All-out pseudo-declarative reactive framework created on the Dart language
  • Great widget gallery for crafting app user interfaces that can leverage either Material Design or iOS-style.
  • Seamless APIs and tools for unit testing and third-party SDK connection.
img

Our Customers’ Results

250%

Increase in Sales of Customers’ Products

550%

Increase in Online Donations for NGOs

5.0★★★★★

Ratings from Clients’ Satisfaction

61.5%

Decrease in Headcount

map-image
map-image