Flutter Overview
Flutter is Google's UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase. It uses the Dart programming language and has gained massive popularity since its launch.
How Flutter Works
┌─────────────────────────────────────────────────┐
│ Flutter Architecture │
├─────────────────────────────────────────────────┤
│ │
│ ┌──────────────┐ │
│ │ Dart Code │ Your Flutter code │
│ │ (Widgets) │ │
│ └──────┬───────┘ │
│ │ │
│ ▼ │
│ ┌──────────────┐ │
│ │ Flutter │ Skia rendering engine │
│ │ Framework │ (draws every pixel) │
│ └──────┬───────┘ │
│ │ │
│ ▼ │
│ ┌──────────────┐ │
│ │ C/C++ │ Engine & platform embedder │
│ │ Engine │ │
│ └──────────────┘ │
│ │
└─────────────────────────────────────────────────┘
Unlike React Native which bridges to native components, Flutter draws every pixel on screen using its own rendering engine. This gives you complete control over the UI.
Key Features
- Single codebase: Build for iOS, Android, web, and desktop from one codebase
- Rich widgets: Comprehensive set of customizable Material and Cupertino widgets
- Hot reload: See changes instantly while coding
- High performance: Compiled to native ARM code for excellent speed
- Great documentation: Google provides excellent docs and codelabs
Dart Programming Language
Flutter uses Dart, which is:
- Easy to learn: Similar to JavaScript and Java
- Statically typed: Catches errors at compile time
- Asynchronous: Built-in support for async/await
- Compiled: AOT compilation for release, JIT for development
When to Use Flutter
Flutter is great when:
- You want pixel-perfect UI control
- You need to target mobile, web, and desktop
- You're building a visually rich app
- You prefer a single language for everything
- You want excellent performance