Activity Lifecycle

The Activity class provides a number of callbacks that allow the activity to know that a state has changed, that the system is creating, stopping, or resuming an activity, or destroying the process in which the activity resides.

LifeCycle’s methods sequence

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onCreate() -> onStart() -> onResume() -> onPause() -> onStop() -> onDestroy()

Activity Lifecycle Diagram

Lifecycle callbacks when one activity comes on top of another

Task

Starting activity2 from the activity1’s onCreate() method as follows

@Override
protected void onCreate(Bundle savedInstanceState) {
   Intent intent = new Intent(this, Activity2.class);
   startActivity(intent);
}

Note: onCreate() of activity1 is already called as activity2 is being called from there.

What happens when press back button on Activity 2: See all the callbacks of activity 1 and activity 2 in below diagram