OnCreate(): It is called when activity is created. Using this, the views are created and data is collected from bundles.
OnStart(): It is called if the activity is becoming visible to the user. It may be succeeded by onResume() if the activity comes to the foreground, or onStop() if it becomes hidden.
OnResume(): It is called when the activity will start an interaction with the user.
OnPause(): This is called when the activity is moving to the background but hasn’t been killed yet.
OnStop(): This is called when an activity is no longer visible to the user.
OnDestroy(): This is called when the activity is finished or destroyed.
OnRestart(): This is called after the activity has been stopped, prior to it being started again.
