O'Reilly logo

Android™ How to Program, Second Edition by Abbey Deitel, Harvey Deitel, Paul Deitel

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

I.3. Text Fields and an Introduction to Event Handling with Nested Classes

Normally, a user interacts with an app’s GUI to indicate the tasks that the app should perform. For example, when you write an e-mail in an e-mail app, clicking the Send button tells the app to send the e-mail to the specified e-mail addresses. GUIs are event driven. When the user interacts with a GUI component, the interaction—known as an event—drives the program to perform a task. Some common user interactions that cause an app to perform a task include clicking a button, typing in a text field, selecting an item from a menu, closing a window and moving the mouse. The code that performs a task in response to an event is called an event handler, and the overall process ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required