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docs: document the wrapper/example app structure

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Nishant Srivastava
2026-08-18 01:05:36 +02:00
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README.md
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@@ -27,6 +27,10 @@ flutter run
New to Flutter? See [Getting Started](/documentation/GETTING_STARTED.md) for full setup and run instructions.
Each example app is split into a wrapper and focused code. `lib/main.dart` sets up
the `MaterialApp`, and `lib/example.dart` contains the code that demonstrates the
concept. Open `lib/example.dart` to see what the app teaches.
## Documentation
- [Example Apps](/documentation/EXAMPLES.md): all examples in this repository

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documentation/CONTRIBUTING.md
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I welcome and encourage all pull requests. It usually takes 24-48 hours to respond to any issue or request.
## Example app structure
Every example app uses the same structure, so the code that teaches a concept is
easy to find:
- `lib/main.dart`: the app wrapper. It holds only `runApp()` and a `MyApp` widget
that returns the `MaterialApp` (title, theme, routes). Keep this file minimal and
uniform across apps.
- `lib/example.dart`: the focused example code. It contains the full screen
(`Scaffold` + `AppBar`) and the widget that demonstrates the concept, with a
`// Example: <what this app teaches>` comment at the top.
- Supporting files (screens, tabs, services, models, widgets, utils) sit alongside
the example and are imported by `lib/example.dart`.
To understand an example app, read `lib/example.dart`. That file holds the concept;
`lib/main.dart` holds only the wrapping boilerplate.
## Basic rules
1. Match coding style (braces, spacing, etc.). Use the `Reformat Code` feature of Android Studio (`CMD` + `Option` + `L` on Mac, `CTRL` + `ALT` + `L` on Linux and Windows).
@@ -11,3 +28,7 @@ I welcome and encourage all pull requests. It usually takes 24-48 hours to respo
1. Check for existing [issues](https://github.com/nisrulz/flutter-examples/issues) before filing a new one.
1. Follow the same standard as all other projects in this repo.
> The package name must conform to the format: `github.nisrulz.<app_name>`
When you add a new example app, keep the wrapper in `lib/main.dart` and the focused
example code in `lib/example.dart`. Run `make docs`, `make analyze`, and `make doctor`
before opening a pull request.

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documentation/GETTING_STARTED.md
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@@ -30,6 +30,14 @@ cd simple_material_app
flutter run
```
## Where to look for the example code
Every example app is split into two files:
- `lib/main.dart`: the app wrapper. It only sets up the `MaterialApp` (title, theme, routes).
- `lib/example.dart`: the focused example code. This file teaches the concept the
app demonstrates. Open it to see how the feature works.
## Useful links
- [Flutter Widgets Catalog](https://flutter.dev/widgets/)