Flutter Tutorial

Flutter is a framework that lets programmers create native cross-platform apps using only one programming language and codebase. It will not produce a browser-based app or anything that can be wrapped by native apps. Instead, it develops a native app for iOS and Android that may be released later in the app stores.

The good news is that instead of using separate programming languages to build an iOS and Android app, you can make this app with just one. You’ll only have to worry about one code base this way. Flutter is a software development kit (SDK) that lets you compile your code into native machine code that runs on the platforms indicated

Flutter serves as a framework by providing a collection of UI building blocks (widgets) such as tabs, dropdowns, and buttons, as well as various utility functions and packages that may be created using the SDK.

What exactly is Dart?

Flutter makes use of the Dart programming language. Its primary goal is to create front-end user interfaces and front-end programmes. You may use it to construct both online and mobile apps.

It is a class-based, object-oriented, and strongly typed programming language developed by Google. Dart’s syntax is fairly similar to those of languages like Java or JavaScript, so if you’ve worked with those before, you’ll have no trouble getting started.

Why Flutter?

Flutter is a lightweight, high-performance framework built on the Dart programming language. It has good performance since it renders the user interface directly on Canvas rather than using the native framework.

Flutter comes with a plethora of UI widgets that may be utilised in applications right immediately. This enables us to progress more quickly.

The Flutter application is a Widget in and of itself. There are numerous gestures and animations.

Flutter’s Benefits

  • Flutter includes gorgeous and customisable widgets that enable us build high-performance apps in a short amount of time.
  • Dart offers a vast number of packages that will assist us in expanding the app’s functionality.
  • With a single source base, we can create an app for both Android and iOS.
  • The developer has complete control over widgets and layouts while using Flutter.
  • It has excellent developer tools, as well as excellent hot reload.

The Anatomy of a Flutter App

The following are the primary components of the Flutter architecture application:

  • Widgets
  • Gestures
  • Concept of State
  • Layers


Widgets are the most important part of every flutter application. It serves as a user interface through which the user may interact with the application. Any flutter application is a widget made up of a number of other widgets. A typical application’s structure is defined by the root, which is followed by a MaterialApp widget, which holds the application’s core components in place. This is where the UI’s and the application’s properties are set. The Scaffold widget in the MaterialApp contains the application’s visible components (widgets). The body and the appbar are the two fundamental features of the Scaffold. It contains all of the child widgets and is where all of their properties are set.


Pre-defined gestures are used for all physical interactions with a flutter application. GestureDetectors are utilised to do this. It’s an inconspicuous widget that handles physical interactions with the flutter application. Gestures like as tapping, dragging, and swiping are used in the interface. These features can be used to enhance the app’s user experience by allowing it to conduct desired actions in response to basic gestures.

Concept of State

You may be familiar with the concept of a state if you’ve worked with React js. Data items are used to represent the states. Flutter runs in a similar environment. StatefulWidget is used for managing state in a Flutter application. When the state changes, the re-rendering of widgets specific to the state happens, similar to how state works in React js. This also prevents the entire application from being re-rendered every time the status of a widget changes.

The architecture of a Flutter app or the flutter framework is typically made up of a mix of small and larger widgets that work together to create the app. Its design and functionality are dependent on all of its levels. As simple as it is to create a flutter application, it is based on a foundation of equally complicated components.


The Flutter framework is divided into categories based on their amount of complexity, and a hierarchy is established based on the diminishing level of these complexities. Layers is a term used to describe these groups. These layers are stacked one on top of the other. The topmost layer is a widget that is specific to the device’s operating system (ie, Android or iOS). The native flutter widgets, which include structural UI components, gesture detectors, state management components, and so on, make up the second layer. This third layer is where all of the user interface and state rendering takes place. It is the layer that contains all of the flutter application’s visible components. The animations used in transitions, visual flow, and gestures are found on the next layer.


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