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Represents a single focused thing the user can do.
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In Android, you can override methods from the Activity to capture lifecycle methods for the activity itself, or register ActivityLifecycleCallbacks on the Application.
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In Flutter, you have neither concept, but you can instead listen to lifecycle events by hooking into the WidgetsBinding observer and listening to the didChangeAppLifecycleState() change event.
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An example of how to observe the lifecycle status of the containing activity:.
Lifecycle events
The observable lifecycle events are:.