Flutter interview Questions and Answers

Q. What is Flutter..???

Flutter is developed by Google and managed by ECMA used to free and open-source UI in development source. With a flutter, programmers can develop beautiful and natively compiled mobile applications. This toolkit is the fastest and most expressive way to build native apps for programmers. This has a rich user interface and much more on the development side.

Q. What are the advantages of flutter..??

Advantage of a flutter:

  • Fast development
  • Hot Reload
  • Screen Reader
  • Quick Rendering
  • Open source and free
  • Cross- platform
  • Flutter goes native
  • Themes for Android and IOS

Q.  What is the limitation of flutter..??

  • Release size is larger
  • Requirements of Dart
  • Third-party libraries are limited
  • Limited complexity
  • Lack of overall support

Q. What are the types of widgets present in flutter?

In flutter, widgets can be divided into two categories: 

Stateless Vs Stateful



Q. What is pubspec.yaml file?

  This file will use a lot during working with the Flutter project. It allows you how your application works. 

  • Project dependencies.
  • Project general settings such as name, description, and version of the project.
  • Project assets (e.g., images, audio, etc.).

Q. Define a method to install flutter..??

To install and run Flutter on the Windows system, you need first to meet these requirements for your development environment.

Operating SystemWindows 7 or Later (I am Windows 10. You can also use Mac or Linux OS.).
Tools1. Windows PowerShell
2. Git for Windows 2.x (Here, Use Git from Windows Command Prompt option).
Disk Space400 MB (It does not include disk space for IDE/tools).
IDEAndroid Studio (Official)
SDKFlutter SDK for Windows

Q. Why does the first Flutter app build take so long?

When you build the Flutter app the first time, it will take a longer time. It is because Flutter built the device-specific APK or IPA file. Thus, the Gradle and Xcode are used to build the file, taking a long time.

Q. What is the importance of Dart in Flutter..??

Using Flutter avoids the use of a separate declarative layout language such as JSX or XML.  A simple Dart program is shown in the following example: 

void main() 

{  

 for (int i = 0; i < 6; i++) 

  {  

         print(‘Hello.. ${i + 1}’);  

  }  

Q.  Write down some app state..??

App State may also be referred to as a shared state or application state

  • User preferences  
  • E-commerce shopping cart 
  • Login info   
  • Social networking notifications, etc

Q. Difference between runApp( ) and main( )..??

runApp(): Using runApp(), return the widgets that are connected to the screen as a root of the widget tree that will be rendered on the screen. This function is called in the main function, which is the driver of the app..

main(): This function starts the program. Flutter does not allow us to write any program without the main() function.  

Q. What are the popular Apps that use Flutter..??

Today many of App are using flutter some of prominent are

  • Birch Finance
  • Google Ads
  • Alibaba
  • Tencent
  • Reflectly

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