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Android Activities

The android activities represent a single screen with a user interface(UI) of an application and it will act as an entry point for users to interact with an app. If you have used C, C++ or Java programming languages then you must have seen that programs in C, C++ start from main() function. Similarly in the android system program starts with the onCreate() method.
The activity life cycle of the android is as shown below:
Activity life cycle
The following callbacks are specified by the Activity class. It’s not necessary to implement all the callback methods but it is important that you should understand each one.
  • onCreate(): This is the first callback method and it is called when the activity is first created.
  • onStart(): The onStart() callback method is called when an activity entered into the start state by completing onCreate() method.
  • onResume(): The onResume() method is called when the user starts interacting with the application.
  • onPause(): The onPause() method does not receive user input and cannot execute any code and called when the current activity is being paused and the previous activity is being resumed.
  • onStop(): The onStop() method is called when the activity is no longer visible.
  • onDestroy(): The onDestroy() method is called before the activity is destroyed by the system.
  • onRestart(): The onRestart() method is called when the activity restarts after stopping it.

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