Flutter in 2 min
🔹 Flutter Basics
➡ Flutter is Google’s UI toolkit for building natively compiled apps for mobile, web, and desktop from a single codebase
➡ Uses Dart programming language
➡ Everything in Flutter is a widget
➡ Fast development with hot reload and a rich set of customizable widgets
🔹 Dart Language Essentials
➡ Object-oriented, class-based language
➡ Supports null safety (? for nullable types)
➡ Main function starts execution: void main() => runApp(MyApp());
➡ Strong typing with optional dynamic typing
🔹 Flutter Project Structure
➡ main.dart — entry point
➡ lib/ — core app code
➡ pubspec.yaml — manages dependencies and assets
➡ android/, ios/ — platform-specific configurations
🔹 Widgets
➡ Everything is a widget (layout, styling, controls)
➡ Two types:
➡ StatelessWidget — static UI
➡ StatefulWidget — dynamic UI
➡ Common widgets:
➡ Text, Container, Row, Column, Stack, ListView, Scaffold, AppBar
🔹 Layouts
➡ Use Row for horizontal layout
➡ Use Column for vertical layout
➡ Use Expanded and Flexible for responsive designs
➡ Container allows padding, margin, border, color, and alignment
➡ SizedBox for spacing and fixed size elements
🔹 State Management
➡ Local State: setState(() {}) for simple updates
➡ Global State:
➡ Provider — lightweight and simple
➡ Riverpod — improved Provider
➡ Bloc — for complex apps
➡ GetX — minimal boilerplate
➡ Use StatefulWidget when state needs to change dynamically
🔹 Navigation
➡ Navigator.push() and Navigator.pop() for screen navigation
➡ Use MaterialPageRoute for transitions
➡ Named routes defined in MaterialApp(routes: {...})
➡ onGenerateRoute for dynamic routing
🔹 Forms & Input
➡ TextField and TextFormField for user input
➡ Form widget to group and validate inputs
➡ Use GlobalKey<FormState> for validation
➡ Controllers manage text input (TextEditingController)
🔹 Buttons
➡ ElevatedButton, TextButton, OutlinedButton
➡ Attach logic with onPressed:
➡ Customize style using style: ButtonStyle(...)
🔹 Lists & Grids
➡ ListView for scrolling lists
➡ ListView.builder() for dynamic lists
➡ GridView.count() or GridView.builder() for grids
➡ ListTile simplifies list item design
🔹 Styling & Themes
➡ Use ThemeData in MaterialApp for global styling
➡ Colors:
Colors.red,
Colors.blue[100], Color(0xFF...)
➡ Fonts, elevation, padding, borders via BoxDecoration and widget properties
🔹 Images & Assets
➡ Declare in pubspec.yaml
➡ Load images using Image.asset('assets/image.png')
➡
Image.network() for web images
🔹 Animations
➡ Implicit: AnimatedContainer, AnimatedOpacity
➡ Explicit: AnimationController, Tween, AnimationBuilder
➡ Use Hero for screen transition animations
🔹 Networking
➡ Use http package for API calls
➡ Async/await to handle network responses
➡ JSON parsing with dart:convert
➡ Best practices include error handling and loading indicators
🔹 Packages
➡ Add dependencies in pubspec.yaml
➡ Run flutter pub get to install
➡ Use packages like http, shared_preferences, provider, path_provider
🔹 Persistence
➡ Shared Preferences for simple key-value storage
➡ SQLite with sqflite package for structured data
➡ File storage via path_provider dart:io
🔹 Platform-Specific Features
➡ Use MethodChannel to call native code (Kotlin/Swift)
➡ Conditional imports for platform targeting
➡ Access sensors, camera, geolocation via plugins
🔹 Testing
➡ Unit tests: test logic functions
➡ Widget tests: verify widget rendering
➡ Integration tests: full app behavior
➡ Use flutter_test and integration_test packages
🔹 Deployment
➡ Build APK: flutter build apk
➡ Build for iOS: flutter build ios
➡ Publish to Play Store or App Store with proper configuration
➡ For web: flutter build web
📘 For a complete Flutter ebook with real-world examples, full widget breakdowns, and project tutorials, grab it here:
➡
codewithdhanian.gumroad.com/…