26.3 Event Listeners and Callback Methods

In the example activity outlined later in this chapter the steps involved in registering an event listener and implementing the callback method will be covered in detail. Before doing so, however, it is worth taking some time to outline the event listeners that are available in the Android framework and the callback methods associated with each one.

•onClickListener – Used to detect click style events whereby the user touches and then releases an area of the device display occupied by a view. Corresponds to the onClick() callback method which is passed a reference to the view that received the event as an argument.

•onLongClickListener – Used to detect when the user maintains the touch over a view for an extended period. Corresponds to the onLongClick() callback method which is passed as an argument the view that received the event.

•onTouchListener – Used to detect any form of contact with...