37.5 Handling Fragment Events

As previously discussed, a fragment is very much like a sub-activity with its own layout, class and lifecycle. The view components (such as buttons and text views) within a fragment are able to generate events just like those in a regular activity. This raises the question as to which class receives an event from a view in a fragment; the fragment itself, or the activity in which the fragment is embedded. The answer to this question depends on how the event handler is declared.

In the chapter entitled “An Overview and Example of Android Event Handling”, two approaches to event handling were discussed. The first method involved configuring an event listener and callback method within the code of the activity. For example:

binding.button.setOnClickListener { // Code to be performed on button click }

In the case of intercepting click events, the second approach involved setting the android:onClick property within the XML layout file...