State Management in Android is a complex concept and to know the reason you have to first understand the architectural design of Android and to learn why it’s the key requirement to manage state. The Marcelo Benites article Managing State in Android defines the best description of the state:

The state is an object that is connected/subscribed to one or more widgets, contains data, and eager to update the widgets from that data. If there’s any change happens in data, it notifies all widgets to whom it’s connected. The values of the state are changed at runtime.

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