All Flutter Guides

How to Set Up Flutter: SDK, IDE, and Emulator

From SDK Installation to Running Your First App

Flutter SDK installation, IDE setup (VS Code/Android Studio), emulator configuration — complete environment setup guide to start development

Hot Reload vs Hot Restart in Flutter: What Each Keeps

Core Feature That Makes Flutter Development 10x Faster

Hot Reload lets you see results within 1 second after code changes — the core of Flutter developer productivity and its biggest differentiator

Useful Sites for Learning Flutter

Collection of helpful external resources

What Is Dart? A Language Built on Null Safety and JIT/AOT

Client-optimized programming language by Google

Dart is an object-oriented language designed by Google for fast, stable apps on all platforms. Everything is an object, with strong typing, Null Safety, and JIT+AOT compilation.

Dart Basic Syntax: var/final/const and the ?, !, ?? Operators

Core Dart syntax, starting from main()

Dart programs start from main(). Covers var/final/const/late/dynamic declarations, string interpolation, Null Safety (?/!/??), and cascade (..) operator.

How Dart's Type System Works: Inference, Casts, and Generics

A statically typed language checked at compile time

Dart is statically typed with compile-time type checking. Covers type inference, is/as casting, type promotion, generics, and typedef.

Dart Classes: extends vs implements vs with

5 constructor types, inheritance, interfaces, Mixin, factory pattern

Dart is fully object-oriented. Design flexible classes with 5 constructor types, extends/implements/with for inheritance, interfaces, Mixins, and factory patterns.

Dart List vs Set vs Map: When to Use Each

Plus spread and collection for/if

Dart's 3 core collections — List (ordered, duplicates), Set (unique, set operations), Map (key-value). Powerful data processing with spread, collection for/if, method chaining.

Dart Async: How to Use Future, Stream, and async/await

Keep the UI responsive during slow work

Handle time-consuming tasks without blocking UI. Future (single result), Stream (continuous events), async/await for sync-like async code.

Dart Exception Handling: Exception vs Error and try-catch

Plus on, rethrow, and async exceptions

Dart distinguishes Exception (recoverable) from Error (unrecoverable). Covers try-catch-finally, on-type handling, rethrow, and async exception handling.

What Are Dart Extensions? Adding Methods to Existing Classes

Examples: capitalize on String, isPrime on int

Extensions add methods, properties, and operators to existing classes without modifying source or inheritance. Add capitalize to String, isPrime to int, distinct to List.

How to Use Dart Records and Pattern Matching

Dart 3.0 — multiple returns, destructuring, switch patterns

Records, introduced in Dart 3.0, are immutable types for grouping values without classes. Combined with pattern matching, switch/if-case can check types and conditions simultaneously.

What Is the Flutter Widget Tree? Widget, Element, RenderObject

The Foundation of Flutter UI — Everything is a Widget

In Flutter, buttons, text, padding, alignment are all widgets. Understand how Widget → Element → RenderObject, three trees compose the UI

StatefulWidget vs StatelessWidget: Which One to Use

Decide by whether the UI changes

Static UI uses StatelessWidget, interactive UI uses StatefulWidget — the right choice determines performance and structure

How Flutter Layout Works: Constraints Down, Sizes Up

Arranging UI with Row, Column, Stack, Flex

Constraints go down, Sizes go up, Parent sets position — understanding these 3 layout rules lets you freely arrange any UI

Provider vs Riverpod: Choosing Flutter State Management

An InheritedWidget wrapper and its successor

Provider is an InheritedWidget wrapper suitable for simple state management, Riverpod is its successor providing compile-time safety and testability

What Is the BLoC Pattern? Separating UI and Logic in Flutter

The one-way Event → BLoC → State flow

One-directional Event → BLoC → State flow completely separates business logic from UI. Excellent maintainability and testability in large-scale apps

Flutter Navigation Basics: push/pop and Named Routes

Stacking screens with Navigator

Implement stack-based screen transitions with Navigator.push()/pop() and set up URL-based routing with Named Routes

How to Use GoRouter: Declarative, URL-Based Routing in Flutter

Deep links, redirects, and auth guards

go_router handles deep links, redirects, nested routes, and guards (auth checks) cleanly with URL-based declarative routing

How to Call a REST API in Flutter: http/dio and JSON

Mapping JSON to Dart objects

Practical guide to calling REST APIs with http or dio packages and mapping JSON serialization/deserialization to Dart objects

How to Publish a Flutter App to the App Store and Google Play

Signing, build settings, store listing, and review

App signing, build configuration, store registration, review handling — complete process for publishing Flutter app to App Store and Google Play

What Are Platform Channels? Calling Swift/Kotlin from Flutter

Camera, Bluetooth, and NFC via MethodChannel

How to communicate with Swift (iOS) / Kotlin (Android) code via MethodChannel when native features like camera, Bluetooth, NFC are needed