December 2013
Beginner
416 pages
12h 45m
English
book
Learning Android™ Application Programming: A Hands-On Guide to Building Android Applications
by James Talbot, Justin McLean, Jorge Hernandez
Content preview from Learning Android™ Application Programming: A Hands-On Guide to Building Android Applications
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Understanding the Activity Lifecycle
As you have seen, an activity is simply a screen or user interface in an Android application—either a full screen or a floating window that a user interacts with. An Android app is made up of different activities that interact with the user as well as one another. For example, a simple calculator would use one single activity. If you enhanced the calculator app to switch between a simple version and a scientific version, you would then use two activities.
Every Android application runs inside its own process. Processes are started and stopped to run an application and also can be killed to conserve memory and resources. Activities, in turn, are run inside the main UI thread of the application’s process.
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