Flutter Tutorial
Flutter is a UI toolkit for building cross-platform applications, developed and maintained by Google. It allows developers to use a single codebase to build natively compiled applications for iOS, Android, Web, Windows, macOS, and Linux simultaneously.
Flutter uses the Dart programming language and features hot reload, a rich widget library, and a high-performance rendering engine, enabling developers to quickly build beautiful, smooth apps with a native experience.
Who should read this tutorial?
This tutorial is suitable for developers with a programming background. If you already understand the basic concepts of object-oriented programming (such as classes, objects, and functions), you will be able to get started with Flutter quickly.
Don't worry if you're not familiar with the Dart language. Flutter is written in Dart, but its syntax is similar to languages like JavaScript, Java, or C#, making it easy to learn.
What you need to know before learning this tutorial
Before learning this tutorial, you need to understand some basic programming concepts, such as variables, functions, classes, and loops. If you have some knowledge of mobile app development, it will be easier to understand how Flutter works.
Flutter Features
The main reasons Flutter has become a popular choice for cross-platform development include the following:
| Features | Description |
|---|---|
| Cross-Platform Development | Build iOS, Android, Web, Windows, macOS, and Linux apps from a single codebase |
| Hot Reload | After modifying code, you can preview changes in real time without restarting the application, making development extremely efficient. |
| Rich component library | Provide two major component libraries: Material Design (Material style) and Cupertino (iOS style) |
| High-Performance Rendering | Uses the Skia graphics engine and the self-developed Impeller renderer to achieve smooth 60fps animations. |
| expressive UI | Powerful declarative UI framework, supports custom widgets, meeting various design requirements. |
| High Development Efficiency | Single Dart language, one set of Widget components, a large number of built-in features. |
Flutter use cases
| Scenarios | Description |
|---|---|
| Mobile application development | Build native iOS and Android apps, with one codebase running on both platforms |
| Web Applications | Build responsive web applications that can be deployed to browsers. |
| Desktop Applications | Build Windows, macOS, and Linux desktop applications |
| Rapid prototype verification | Hot reload feature makes rapid iteration and prototyping very efficient. |
| Enterprise Applications | Suitable for enterprise-level applications that need to be deployed across multiple platforms. |
Flutter technical architecture
Flutter adopts a layered architecture, mainly including the following three layers:
| Level | Description |
|---|---|
| Framework (framework layer) | Dart-implemented UI framework, including widgets, rendering, and animations. |
| Engine (engine layer) | A rendering engine implemented in C++, including Skia/Impeller and the Dart runtime |
| Embedder (embedder layer) | Platform-specific embedding layer that embeds Flutter into each platform. |
Flutter's core design philosophy is "everything is a Widget". Whether it is simple text or complex page layouts, everything is composed of Widgets.
Why choose Flutter?
| Comparison Dimension | Flutter | React Native | Native Development |
|---|---|---|---|
| Programming Language | Dart | JavaScript/TypeScript | Swift/Kotlin/Java |
| Rendering Method | Own rendering engine (Skia/Impeller) | Native component mapping | Native Rendering |
| Performance | High (close to native) | Medium (requires bridging) | Highest |
| Code Reuse | One codebase, multiple platforms | One codebase, multiple platforms | Need to Write Separately |
| Learning Curve | Medium (Dart language) | Medium (requires knowledge of React) | Relatively high (multiple languages) |
Related Links
| Resources | Address |
|---|---|
| Flutter official website | https://flutter.dev |
| Flutter official documentation | https://docs.flutter.dev |
| Flutter API Reference | https://api.flutter.dev |
| Flutter component directory | https://docs.flutter.dev/ui/widgets |