By Steve Heller

Introduces a suite of powerhouse algorithms which could supercharge almost any C++ application, from streamlining random entry to variable-length files, to dashing huge database varieties. CD-ROM integrated. Paper. DLC: C++ (Computer application language).

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Fm Page 24 Thursday, April 9, 2009 5:35 PM 24 CHAPTER 5 ■ USING XML-BASED LAYOUTS The Rest of the Story In the original Now demo, the button’s face would show the current time, which would reflect when the button was last pushed (or when the activity was first shown, if the button had not yet been pushed). Most of that logic still works, even in this revised demo (NowRedux). main)). xml in our project’s res/layout directory). The other difference is that we need to get our hands on our Button instance, for which we use the findViewById() call.

ActivityCreator), gives you the application. Figure 6-1. The LabelDemo sample application Button, Button, Who’s Got the Button? We’ve already seen the use of the Button widget in Chapters 4 and 5. As it turns out, Button is a subclass of TextView, so everything discussed in the preceding section in terms of formatting the face of the button still holds. Fleeting Images Android has two widgets to help you embed images in your activities: ImageView and ImageButton. As the names suggest, they are image-based analogues to TextView and Button, respectively.

These are called intent receivers and are described in Chapter 23. You may have one or more provider elements indicating content providers—components that supply data to your activities and, with your permission, other activities in other applications on the device. These wrap up databases or other data stores into a single API that any application can use. Later you’ll see how to create content providers and how to use content providers that you or others create. Finally, you may have one or more service elements describing services—long-running pieces of code that can operate independent of any activity.

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