# gsy_flutter_demo: a catalogue of standalone Flutter widget examples

> CarGuo/gsy_flutter_demo collects small, self-contained Flutter samples for common UI problems, from sticky list headers to verification code inputs. It is a reference catalogue, not a framework, and the README is the only map.

**CarGuo/gsy_flutter_demo** — Flutter 不同于 GSYGithubAppFlutter 完整项目，本项目将逐步完善各种 Flutter 独立例子，方便新手学习上手和小问题方案解决。  目前开始逐步补全完善，主要提供一些有用或者有趣的例子，如果你也有好例子，欢迎提交 PR 。

- Repository: https://github.com/CarGuo/gsy_flutter_demo
- Website: https://juejin.im/user/582aca2ba22b9d006b59ae68/posts
- Stars: 3,428 · Forks: 539
- Language: Dart
- License: MIT
- Published: 2026-09-23 · Updated: 2026-09-23 · Language: en
- Canonical page: https://hysenlabs.com/projects/carguo-gsy-flutter-demo

## What gsy_flutter_demo is for, and who it is not for

The README opens by separating this repository from GSYGithubAppFlutter: this one, it says, will gradually fill in various standalone Flutter examples so newcomers can get started and small problems can be solved. That sentence is the whole scope. There is no library to import, no package on a registry, no API surface. What you get is a demo application whose routes are individual pages, each one demonstrating a single UI behaviour.

The audience is therefore narrow and specific. It suits a developer who has hit a concrete problem, say a list header that should stick while scrolling, and wants to read a working implementation instead of a blog post. It also suits someone building a mental map of what Flutter widgets can do, because the README groups the pages into categories with counts: 39 basic widget pages, 31 list and scrolling pages, and further groups beyond the part of the README available here.

It does not suit a team looking for a maintained component to depend on. Nothing here is published as a package, so there is no version to pin, no changelog per example, and no deprecation policy. The repository releases tags such as v4.1.0, but those tag the demo application as a whole, not individual samples.

## How the demo is organised: routes, page files and a category table

The architecture is flat and easy to reason about. The repository root holds the usual Flutter platform folders (android, ios, linux, macos, web, windows), plus assets, shaders, static, docs and lib. The examples live under lib, and the README's route table maps each numbered demo to its page file. A sticky-header sample is listed as `widget/scroll/stick/stick_demo_page.dart`; the two-argument version is `widget/scroll/stick/stick_demo_page2.dart`. A custom multi-render layout example is `widget/basic/custom_multi_render_demo_page.dart`.

That naming convention is the real documentation. The path tells you the category (basic, scroll, visual) and the page file tells you the technique. Some entries even name their origin, such as a star-burst animation marked as ChatGPT-generated code, which is a useful signal about how much scrutiny a given file has had.

The data flow is the ordinary Flutter one: a route table points at page widgets, each page builds its own subtree and holds its own state. There is no shared service layer, no state management library described in the README, and no plugin abstraction. That is a deliberate simplification, and it is also why the samples are easy to lift: a page file usually depends on Flutter itself and little else.

## Running gsy_flutter_demo locally

The README states one hard prerequisite: configure a Flutter development environment, with Flutter SDK version 3.35 or newer. It also notes that if cloning is slow or images do not load, you can try the Gitee mirror it links to. There is a web version for online testing and an APK download from the releases page, so you can look before you build.

Start by cloning and checking the SDK constraint. The repository carries an `.fvmrc` file, which suggests FVM users can pin the Flutter version the project expects.

```bash
git clone https://github.com/CarGuo/gsy_flutter_demo.git
cd gsy_flutter_demo
flutter --version
flutter pub get
```

After `flutter pub get` resolves dependencies from `pubspec.yaml`, run the app on a device or emulator. The README does not print a run command, but the standard entry point applies:

```bash
flutter run
```

You should land on the demo's route list, which is the index the README's tables describe. Pick any numbered entry and the corresponding page file opens. To study one sample in isolation, read the page file from the table first, for example `lib/widget/scroll/stick/stick_demo_page.dart`, then run the app and find the matching route. The README does not document a way to launch a single demo directly, so navigation through the index is the path.

## Where the catalogue format breaks down

The first limitation is documentation depth. The README is a table of Chinese page names and file paths, not an explanation of each technique. If you want to know why a sticky header uses one sliver configuration over another, the answer is in the code, not in prose. For a reader who needs the reasoning, this is a code dump with an index.

The second is that the samples are pages in an application, not isolated packages. Copying one means copying its widget tree, its imports and any local helpers it pulls in. There is no `pubspec` per example and no import line you can add to your own project. The README also flags that several demos are App-only, such as status bar colour changes and keyboard handling, so they will not behave the same on the web build the project offers.

The third is compatibility drift. The README pins Flutter 3.35 or newer as the floor, and the repository has been pushed as recently as 2026-04-09, but nothing in the README promises that an older example still compiles against a current SDK, or that a newer one works on an older SDK. Treat each page as a snapshot of the Flutter version it was written against. If you are on an older channel, this is the wrong source: the examples assume the newer SDK APIs.

## gsy_flutter_demo compared with a widget package

The natural alternative is a published Flutter package that implements the same behaviour as a reusable widget, for instance a sticky-header or pull-to-refresh package you add to `pubspec.yaml` and import. The difference in approach is fundamental. A package gives you a versioned dependency, an API you can call, and an upgrade path when Flutter changes underneath it. gsy_flutter_demo gives you source code to read and adapt, with no version boundary around any single sample.

That trade is not automatically worse. A package hides its implementation, and when it does not fit your layout you are stuck arguing with its API. A page file you copy is yours to modify, and the demo shows the whole mechanism, including the parts a package would abstract away. The cost is that you own the maintenance from the moment you paste it.

The same comparison applies to the author's other repositories. GSYGithubAppFlutter is a complete application, and the README lists parallel versions in Android Compose, React Native, Kotlin View and Weex. Those are for reading a full app structure. This repository is for reading one screen at a time, which is a different kind of reference.

## Licence, maintenance and what an upgrade costs you

The repository is MIT-licensed, with a LICENSE file at the root and a privacy.html page alongside it. MIT is permissive: you can reuse the sample code in your own project, including commercial work, provided you keep the copyright notice and licence text. That is the general shape of the licence, not legal advice, and if you are copying substantial portions into a product you should read the LICENSE file yourself.

Maintenance signals are mixed but readable. The repository is not archived, and the last push was on 2026-04-09. Releases are infrequent and large: v4.1.0 on 2025-11-25, v3.0.0 on 2025-05-28, and v2.0.0 back on 2023-03-20. That cadence suggests the project is updated in batches rather than continuously, so do not expect a fix for a broken sample to arrive quickly.

The upgrade cost sits with you. Because the samples are not packages, there is no dependency to bump. There is only the Flutter SDK floor of 3.35 and whatever APIs a given page uses. When you adopt a sample, you are adopting its assumptions about the framework version, and the README does not track which sample needs which API.

## Conclusion

Adopt gsy_flutter_demo if you learn by reading a working page file rather than a tutorial, and if you are on Flutter SDK 3.35 or newer. Skip it if you need a packaged widget with a versioned API, tests and a changelog: the samples are pages inside a demo app, not published packages. Before you copy anything, open the page file listed in the README table, check which Flutter APIs it uses, and confirm it still builds on your SDK, because the repository has no per-example compatibility note.

## FAQ

### What Flutter SDK version does gsy_flutter_demo require?

The README states you need a configured Flutter development environment with Flutter SDK version 3.35 or newer. The repository also includes an .fvmrc file for pinning the Flutter version with FVM.

### Is gsy_flutter_demo a package I can add to pubspec.yaml?

No. The README describes it as a collection of standalone Flutter examples, and the samples are page files inside a demo application rather than published packages. You read or copy the page file instead of importing a dependency.

### Can I try gsy_flutter_demo without building it myself?

Yes. The README links a web version for online testing and an APK download from the project's releases page. Note that some demos, such as status bar colour changes and keyboard handling, are marked as App-only.

### What licence does gsy_flutter_demo use?

The repository is MIT-licensed and includes a LICENSE file at the root. MIT permits reuse with the copyright notice and licence text retained, but you should read the LICENSE file for the exact terms.

## Sources

- [CarGuo/gsy_flutter_demo on GitHub](https://github.com/CarGuo/gsy_flutter_demo)
- [License: MIT](https://github.com/CarGuo/gsy_flutter_demo/blob/master/LICENSE)
- [Project website](https://juejin.im/user/582aca2ba22b9d006b59ae68/posts)
- [README](https://github.com/CarGuo/gsy_flutter_demo/blob/master/README.md)
- [Releases](https://github.com/CarGuo/gsy_flutter_demo/releases)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/carguo-gsy-flutter-demo