Proper handling of orientation changes centers around saving this state and also avoiding memory leaks. To work around this, Android gives you the opportunity to save your app’s state before destroying your Activities and Fragments, and the opportunity to restore your state when recreating them. When it destroys your Activities and Fragments it will end up creating new instances of them which will wipe out all of your member variables. Android does this so that your application can reload resources based on the new configuration. When you rotate your device and the screen changes orientation, Android usually destroys your application’s existing Activities and Fragments and recreates them.
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