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The activity lifecycle  |  App architecture  |  Android Developers

https://developer.android.com/guide/components/activities/activity-lifecycle.html

“An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map. Each activity is given a window in which to draw its user interface…” (the page’s own description)

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