Android 9 Development Cookbook - Third Edition

Listening for click and long-press events

Almost every application needs to recognize and respond to basic events such as clicks and long-presses. It's so basic, in most recipes we use the XML onClick attribute, but more advanced listeners require to be set up through code.

Android provides an Event Listener interface for receiving a single notification when certain actions occur, as shown in the following list:

• onClick(): It's called when a View is pressed
• onLongClick(): It's called when the View is long-pressed
• onFocusChange(): It's called when the user navigates to or from the View
• onKey(): It's called when a hardware key is pressed or released
• onTouch(): It's called when a touch event occurs

This recipe will demonstrate responding to ...