1. Android App Basics – Activity Lifecycle
As resources are limited on a mobile phone, the operating system must be able to destroy an activity, which is not active (meaning: in the foreground of the screen), at any time.
Therefore, every Activity has a lifecycle which is handled by the Android operating system.
To avoid losing data or the state of an activity, you must override lifecycle methods to save your data when your activity is paused (not in the foreground anymore but still visible) or stopped (not
visible anymore).
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