Titlebook: Beginning Android; Mark L. Murphy Book 2009 Mark Murphy 2009 Android.Container.Go.Internet.Java.Web Services.WebKit.database.programming.s

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,“I Knew That Factory Wasn’t Going to Last”,n Chapter 6, you saw how fields could have constraints placed upon them to limit possible input, such as numeric-only or phone-number-only. These sorts of constraints help users “get it right” when entering information, particularly on a mobile device with cramped keyboards.

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A Semiotic Perspective on the Sciences,he widgets and containers covered to date are not only found in many GUI toolkits (in one form or fashion), but also are widely used in building GUI applications, whether Web-based, desktop, or mobile. The widgets and containers in this chapter are a little less widely used, though you will likely find many to be quite useful.

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Topics in Contemporary Semioticsike applications for the desktop and some mobile operating systems, such as Palm OS and Windows Mobile, Android supports activities with application menus. Some Android phones will have a dedicated menu key for popping up the menu; others will offer alternate means for triggering the menu to appear.

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Employing Basic Widgetsvery GUI toolkit has some basic widgets: fields, labels, buttons, etc. Android’s toolkit is no different in scope, and the basic widgets will provide a good introduction as to how widgets work in Android activities.

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