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In Nutrient Android SDK, form events are accessible through the FormManager interface, which is implemented by the PdfFragment. There, you can find the following listeners for subscription:

ListenerDescription
OnFormElementClickedListenerListener for form element click events.
OnFormElementDeselectedListenerListener for form element deselection.
OnFormElementEditingModeChangeListenerListener for form element editing mode enter/exit.
OnFormElementSelectedListenerListener for form element selection.
OnFormElementUpdatedListenerListener for form element updated events.
OnFormElementViewUpdatedListenerListener for form element view updates — validation, contents of the view changed, etc.

For examples on how to use these events, see our forms events and notifications guide. For general information on how Nutrient Android SDK implements forms, see our introduction to forms guide.