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Many programmers will place a further restriction on their program s data one that stops it from being changed while the program is running. These read-only data values are referred to as constants. The initial value of a constant must be set on the same line of code where you create the constant. Once your code is saved in either an .exe or .dll file, the value will always be the same each time the code is loaded into memory. It is a common programming convention to name your constants using all uppercase letters, making them easy to spot: VB .NET Const PI as Double = 3.14 C# const double PI = 3.14;

When a user picks up an Android device (or any smartphone for that matter), their first impression is often defined by their experience interacting with the phone s home screen. On the home screen, a user interacts with applications, initiates a phone call, searches the device, launches a browser, and more. By the time the user begins to browse for an application among the sea of icons in the launcher window, a certain percentage of users will be lost and will conclude that the device just isn t user friendly. This can be likened to burying important web content deep within a website you need to be wary of hiding the value of your applications. One solution to this challenge for Android is to employ an AppWidget.

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An AppWidget is code that runs on the home screen of an Android device. The visual size of an AppWidget instance can vary and is designated by the programmer at design time. The home screen is broken up into 16 usable spaces, each of which is approximately 74 pixels square. An AppWidget can span a rectangular area ranging from 1x1 spaces to 4 x 4 spaces, provided there s room on the current home screen page. (A typical phone has around five to nine home screen pages.) An AppWidget is typically deployed as a read-only interface providing a view into application data. The UI is implemented in a manner similar to a layout for a traditional Android Activity. Unlike the Activity, the AppWidget is much more constrained in that the only user action permitted is a click. An AppWidget can t present a scrollable list, an EditText, or any other user input mechanism beyond something that can react to a click. When anything beyond a click is required as user interaction, it s prudent to load an Activity for the heavy lifting an AppWidget just isn t designed for significant user interactions. In this case, the AppWidget acts as a storefront for the underlying Activity. It accepts a click and then hands control off to the back office, implemented typically by an Activity. Despite this apparent shortcoming, not all AppWidgets require anything beyond a basic user interface. For example, consider the Power Control Widget Figure 17.1 Power Control shown in figure 17.1. The Power Control Widget is an Widget on the home screen

If the programmer wants to allow changes to a value, they can create a variable instead. A variable allows both reading and writing of the data. Unlike constants, variables store data that can be set with an initial value and then be changed while the program is running: VB .NET Dim x as Int32 = 5 'x starts off with the value of 5 x = 10 'x now hold the value of 10 C# Int32 x = 5; //x starts off with the value of 5 x = 10; //x now hold the value of 10 Again, this is different from constants, which store data that can be set with an initial value but cannot be changed while the program is running:

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