When an Activity first starts, the onCreate() method is called.The onCreate() method has a single parameter, a Bundle, which is null if this is a newly started Activity. If this
Activity was killed for memory reasons and is now restarted, the Bundle contains the previous state information for this Activity so that it can reinitiate. It is appropriate to perform any setup, such as layout and data binding, in the onCreate() method. This includes calls to the setContentView() method.
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