In the event that you have worked with C, C++ or Java programming language you more likely than not seen that your program begins from main() work. Fundamentally the same as way, Android framework starts its program inside an Activity beginning with an approach onCreate() callback method. There is a sequence of callback methods that fire up an action and an arrangement of callback strategies. That destroy an action as demonstrated in the beneath Activity lifecycle diagram.
| Callback | Description |
|---|---|
| onCreate() | When the activity is first created this is the first call back |
| onStart() | This callback is called when the activity becomes visible to the user |
| onPause() | This paused activity does not receive user input and cannot execute any code and it will pause the application activities until change the status |
| onResume() | This is called when the user starts interacting with the application |
| onStop() | This callback is called when the activity no longer needs to be visible |
| onDestroy() | This callback is called before the activity is destroyed by the system |
| onRestart() | This callback is used when the activity restarts after stopping it |
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