Flutter, Firebase, SQLite, API Overview

Flashcards reviewing key concepts related to Flutter app development, Firebase integration, SQLite usage, and API interactions.

What language is used to write Flutter apps?

Dart

What is a widget in Flutter?

A building block of the UI

Which method is the entry point of a Flutter app?

main()

What is the purpose of setState() in Flutter?

Notify the framework to rebuild the UI

Which widget is used to create a scrollable list in Flutter?

ListView

What is the use of pubspec.yaml in a Flutter project?

Managing dependencies

When is StatelessWidget used?

When the UI does not change

What is hot reload in Flutter?

Quickly injecting updated code

What is the parent of all Flutter widgets?

Widget

Which layout widget arranges children vertically?

Column

How do you navigate between screens in Flutter?

Navigator.push()

Which package is used for state management in Flutter?

provider

What is the use of FutureBuilder?

Asynchronous data handling

What does the MaterialApp widget do?

Sets up the base of a Material Design app

Which keyword is used to define a class in Dart?

class

Dart is:

Compiled

Which widget displays one child at a time from a list?

PageView

The initState() method is called:

Before build

What is the purpose of async and await in Dart?

Handling asynchronous code

Which Flutter command is used to create a new app?

flutter create

Flutter uses what rendering engine?

Skia

How to add an image from assets in Flutter?

Image.asset()

What widget provides a structure with AppBar, body, etc.?

Scaffold

Dart supports:

OOP and functional

What is BuildContext in Flutter?

Handle to location in widget tree

Firebase is a:

Backend-as-a-Service (BaaS)

Which Firebase service is used for real-time data?

Firebase Realtime Database

Firebase Authentication allows login via:

Multiple providers

Which Firebase service is used for push notifications?

Firebase Cloud Messaging (FCM)

Firestore is a:

NoSQL document database

Firebase Hosting is used for:

Hosting web apps

How to integrate Firebase with Flutter?

Add dependencies in pubspec.yaml and initialize Firebase

Firebase supports which platforms?

All of the above

What is the first step in using Firebase in Flutter?

Add Firebase to the project

What is Firebase's NoSQL alternative to Realtime Database?

Cloud Firestore

Firebase Functions are written in:

JavaScript/TypeScript

Firebase Analytics tracks:

User behavior and events

Firebase Storage is used to store:

Files like images and videos

How to send email verification in Firebase Auth?

user.sendEmailVerification()

Firebase Realtime Database stores data in:

JSON format

How are Firebase rules defined?

JSON-based security rules

Which Firebase feature helps with app performance tracking?

Performance Monitoring

Firebase Authentication SDK provides:

Login, registration, password reset

Can Firebase Firestore work offline?

Yes

What Firebase tool is used for testing push notifications?

Firebase Console

SQLite is a:

Local database engine

Which Flutter package is commonly used with SQLite?

sqflite

How does SQLite store data?

Tables and rows

SQLite is:

Embedded

SQLite supports which query language?

SQL

What function opens a database in sqflite?

openDatabase()

How to insert data using sqflite?

db.insert()

What is a primary key in SQLite?

Unique identifier

SQLite is best used for:

Local offline storage

Which file extension is used for SQLite DB files?

.db

Can you define foreign keys in SQLite?

Yes

To execute raw SQL in sqflite, you use:

db.rawQuery()

What data types does SQLite support?

INTEGER, TEXT, REAL, BLOB, NULL

Is SQLite open-source?

Yes

Which method updates data in SQLite?

db.update()

What does API stand for?

Application Programming Interface

REST API uses which protocol?

HTTP/HTTPS

Which HTTP method is used to retrieve data?

GET

What does the HTTP status code 200 mean?

OK

Which package is commonly used in Flutter for API calls?

http

What is JSON?

Data interchange format

What is the typical format of a REST API response?

JSON

What is an API endpoint?

URL to access resources

What is the purpose of headers in API requests?

Provide metadata

Which HTTP method is used to create new data?

POST

What status code indicates "Not Found"?

404

Which tool is used to test APIs manually?

Postman

What does PUT do in an API?

Replaces existing data

What is the role of async in API calls?

Handles asynchronous operations

What is the use of await in Dart?

Waits for async response

What does the 500 HTTP status code represent?

Server error

APIs can return:

JSON, XML, or plain text

An API key is used for:

Authentication and access control

OAuth is used in APIs for:

Authorization

What is the correct content-type header for sending JSON?

application/json

What is the primary platform Flutter apps can target?

Android, iOS, Web, Desktop

What is cross-platform development?

Building apps for multiple OSes using one codebase

Which file contains Android-specific configuration in Flutter?

AndroidManifest.xml

Which file defines iOS permissions in Flutter apps?

Info.plist

What’s a common IDE for Flutter?

Android Studio / VS Code

Which Flutter command runs your app on a device?

flutter run

What is the use of emulator in mobile development?

Testing apps without real device

How do you debug apps in Flutter?

Use flutter debug tools or IDE debuggers

Which tool lets you view Flutter widget trees?

Flutter DevTools

What’s the purpose of adaptive design in mobile apps?

Works across devices with different screen sizes

What's the recommended way to persist small user settings?

SharedPreferences

What does APK stand for?

Android Package

What does iOS use instead of APK?

IPA (iOS App Store Package)

What’s used to sign Android apps for release?

Keystore file

What is a splash screen?

Intro screen when app launches

How do you handle responsiveness in Flutter?

MediaQuery and LayoutBuilder

What is CI/CD in mobile development?

Continuous Integration/Continuous Deployment

What’s the use of the build.gradle file in Android?

Manage build settings and dependencies

What's the purpose of the Android res folder?

Store resources like images, strings, layouts

Which command is used to build a release version of your app in Flutter?

flutter build apk --release