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Unlocking Android: A Developer’s Guide by Robi Sen, Charlie Collins, Frank Ableson

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Chapter 3. User interfaces

With our introductory tour of the main components of the Android platform and development environment complete, it is time to look more closely at the fundamental Android concepts surrounding activities, views, and resources. Activities are essential because, as you learned in chapter 1, they make up the screens of your application and play a key role in the all-important Android application lifecycle. Rather than allowing any one application to wrest control of the device away from the user and from other applications, Android introduces a well-defined lifecycle to manage processes ...

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