Android APP
What is Life Cycle of an Activity tutorials
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Each Activity has its own Lifecycle methods.
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As a user navigates through, out of, and back to your app, theActivity instances
in your app transition between different states in their lifecycle.
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When an action opens a new activity from your current activity, a new set
of life cycles methods will be called on the current activity as it moves
towards the background.
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The life cycle methods enable the programmer to define how the activity
will behave when the user leaves and reenters the activity.
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For example while messaging if a person gets a phone call, the messaging
activity should save its state and instance so that when the user is finished with
his call, he can find the state intact.