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As is evident from the diagram in figure 3.4, which isn t an exhaustive representation, the View is the base class for many classes. ViewGroup is a special subclass of View related to layout, as are other elements such as the commonly used TextView. All UI classes are derived from the View class, including the layout classes (which extend ViewGroup). Of course, everything that extends View has access to the base class methods. These methods allow you to perform important UI-related operations, such as setting the background, the minimum height and width, padding, layout parameters, and eventrelated attributes. Table 3.2 lists some of the methods available in the root View class. Beyond the base class, each View subclass typically adds a host of refined methods to further manipulate its respective state, such as what s shown for TextView in table 3.3. The View base class and the methods specific to the TextView combine to give you extensive control over how an application can manipulate an instance of the TextView. For example, you can set layout, padding, focus, events, gravity, height, width, colors, and so on. These methods can be invoked in code, or set at design time when defining a UI layout in XML, as we ll introduce in section 3.3. Each View element you use has its own path through the API, which means that a particular set of methods is available; for details on all the methods, see the Android Javadocs at http://code.google.com/android/reference/android/view/View.html.

that the bean is in inconsistent state and will destroy the instance. Because unnecessarily destroying bean instances is costly, you should never deliberately use system exceptions. Although the simplified code is very tempting, we recommend that you use application exceptions for CMT rollback carefully. Using the setRollbackOnly method, however verbose, removes the guesswork from automated transaction management, especially for junior developers who might have a hard time understanding the intricacies of exception handling in EJB. However, don t interpret this to mean you should avoid using custom application exceptions in general. In fact, we encourage the use of this powerful and intuitive errror-handling mechanism widely used in the Java realm. As you can clearly see, CMT relieves you from all but the most unavoidable details of EJB transaction management. However, for certain circumstances, CMT may not give you the level of control you need. BMT gives you this additional control while still providing a powerful, high-level API, as you ll see next.

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When defining your own custom attribute type, you can define a constructor that takes parameters that a developer applying an instance of your attribute type must specify. In addition, you can define nonstatic, public fields and properties in your type that identify settings a developer applying an instance of your attribute type can optionally specify. When defining an attribute type s instance constructor, fields, and properties, you must restrict yourself to a small subset of data types. Specifically, the legal set of data types is limited to any of the following: Boolean, Char, Byte, SByte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, String, Type, Ob ject, or an enumerated type. In addition, you can use a single dimension, zero based array of any of these types. When applying an attribute, you must pass a compile time constant expression that matches the type defined by the attribute class. Wherever the attribute class defines a Type parameter, Type field, or Type property, you must use C# s typeof operator as shown in the following code. Wherever the attribute class defines an Object parameter, Object field, or Object property, you can pass an Int32, a String, or any other constant expression. If the constant expression represents a 278

labeledwebview 46 multipleTouchEnabled 97 properties 59 properties that affect resizing 75 UIViewController 69, 351, 368 and flipside controller 127 and UINavigationController 119 descendent of NSObject 71 dismissModalViewControllerAnimated: method 137 lifecycle events 77 presentModalViewController:animated: method 137 properties 75 UIWebView 272, 276 280, 369 adding DetailView to 134 detectsPhoneNumbers 277 error codes 279 goBack 277 goForward 277 loadHTMLString:baseURL: 277 loading, methods 276 277 loadRequest: 277 methods 277 reload 277 reloading 135 scalesPageToFit 277 UIWebViewDelegate, methods 278 UIWebViewDelegate, protocol 49 UIWindow 44, 88, 369 updatedTransactions 352 updateLocationFor:toLocation: 204 URL and NSURL 274 working with 274 276 URLWithString 274 URLWithString:relativeToURL: 274 user experience, enhancements in iPhone OS 4.0 364 user input 11, 140 141 user interaction, in a game 314 315 user preference 141 creating 142 147 creating settings 149 150 default value of nil 151 dictionary of values 149 editing settings 148 149 maintaining 141 151 saving 145 147 settings 150 151 using system settings 147 151 UTF8String 165 Utility Application 50 51 Utility Application template 127 flipside controller 142

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