seniorFlutter
Explain the intricacies of App Lifecycle (Resumed, Inactive, Paused, Detached).
Updated Apr 28, 2026
Short answer
The AppLifecycleState dictates the visibility and execution context of the app.
Deep explanation
To listen, mixin WidgetsBindingObserver to a State object and override didChangeAppLifecycleState.
- Resumed: Visible and responding to input.
- Inactive: Visible but not receiving input (e.g., a phone call overlay).
- Paused: Backgrounded, not visible. OS may suspend it.
- Detached: Engine is running but no view is attached.
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