Flutter

Build performant cross-platform apps with Flutter widgets, state management, and platform integration.

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Last updated: April 29, 2026

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Topic	File
setState, state loss, keys	`state.md`
build method, context, GlobalKey	`widgets.md`
FutureBuilder, dispose, mounted	`async.md`
Context after pop, deep linking	`navigation.md`
const, rebuilds, performance	`performance.md`
Platform channels, null safety	`platform.md`

```
setState
```
after dispose — check
```
mounted
```
before calling, crashes otherwise
Key missing on list items — reordering breaks state, always use keys
FutureBuilder rebuilds on parent rebuild — triggers future again, cache the Future
BuildContext after async gap — context may be invalid, check
```
mounted
```
first
```
const
```
constructor — prevents rebuilds, use for static widgets
```
StatefulWidget
```
recreated — key change or parent rebuild creates new state
GlobalKey expensive — don't use just to access state, pass callbacks instead
```
dispose
```
incomplete — cancel timers, subscriptions, controllers
Navigator.pop with result — returns Future, don't ignore errors
ScrollController not disposed — memory leak
Image caching — use
```
cached_network_image
```
, default doesn't persist
PlatformException not caught — platform channel calls can throw