Application Lifecycle
AppLifecycleState, WidgetsBindingObserver, background/foreground, app termination
1Which mixin should be used to observe Flutter app lifecycle state changes?
Which mixin should be used to observe Flutter app lifecycle state changes?
Answer
WidgetsBindingObserver is Flutter's official mixin for observing app lifecycle state changes. It needs to be added to the State class and the observer registered with WidgetsBinding.instance.addObserver in initState, then removed in dispose.
2Which WidgetsBindingObserver method is called when the app lifecycle state changes?
Which WidgetsBindingObserver method is called when the app lifecycle state changes?
Answer
The didChangeAppLifecycleState method is called whenever the app lifecycle state changes. It receives an AppLifecycleState parameter indicating the new state of the application (resumed, inactive, paused, detached, hidden).
3Which AppLifecycleState indicates the app is visible and responding to user input?
Which AppLifecycleState indicates the app is visible and responding to user input?
Answer
The resumed state indicates the app is visible, in the foreground, and responding to user input. This is the normal operating state where the user is actively interacting with the application.
When does AppLifecycleState.inactive occur on iOS?
Which AppLifecycleState indicates the app is no longer visible to the user?
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