In what cases does the complete creation of a new Activity occur in Android?

The complete creation of a new Activity in Android occurs in the following cases:

1. When the Activity is launched for the first time — when the user opens the screen for the first time.
2. If the Activity was destroyed by the system (for example, due to lack of memory) and the user returns to it.
3. When the finish() method is explicitly called for the Activity and it is subsequently restarted.
4. If flags are set in the manifest or when launching the Activity that force the creation of a new instance (for example, FLAG_ACTIVITY_NEW_TASK).

In these cases, the onCreate() lifecycle method is called, and a new Activity object is created.