What information is displayed to the user when each Callback method in Activity is executed?

By default, no information is directly displayed to the user when each Activity lifecycle callback method is executed (for example, onCreate, onStart, onResume, onPause, onStop, onDestroy). These methods manage the state of the Activity and interaction with the system but do not output UI messages.

If a developer wants to show information to the user when these methods are called, they should explicitly implement this, for example, through Toast, Snackbar, or updating the UI.

Example of displaying a Toast in onResume:

@Override
protected void onResume() {
    super.onResume();
    Toast.makeText(this, "Activity resumed", Toast.LENGTH_SHORT).show();
}