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Understanding Android Lifecycle
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Lifecycle.md

  • onCreate -> Builds UI. Activity is created.

  • onStart -> Activity is visible.

  • onResume -> Becomes active foreground app.

In reverse:

  • onPause -> Activity has lost focus(for example, if it's partially obscured: a dialog pops up or whatever).

  • onStop -> No longer visible(completely obscured, moved to the background).

  • onDestroy -> Activity is destroyed, indicating the end of activity lifecycle.

And, plus, if we hit home and relaunch the app(not destroying it; without being recreated) we get extra state, onRestart.

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