Chapter 4. Intents and services
The canonical Android application comprises Activity and View objects on the front end and Intent and Service objects on the back end. As we discussed in chapter 3, activities are roughly comparable to UI screens, and views are UI components. When a user interacts with a screen, that screen usually represents a task, such as display a list of choices and allow selection, gather information through form input, or display graphics and data. Once each screen is finished with its individual job, it usually hands off to another component to perform the next task. ...
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