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Regardless of what type of software application you decide to build, it is inevitable that at some point it will run into unexpected errors or exceptions during normal processing. During the development, however, you should make every attempt to keep this occurrence to a minimum. With that being said, you need to be prepared to gracefully handle any errors and exceptions and track the errors by logging them in some way. This discussion is, of course, referring to exception handling within a software application. Within the case study, you ll implement exception handling by using the Global.asax file and the Application_Error event. Along with this, you will specify a default error page within the Web.config file that will be displayed anytime an exception occurs during the user experience. This will accomplish the tasks of gracefully handling an exception and showing the user that an error occurred; in addition, a more pleasant web page than the default ASP .NET exception page will be displayed. The following exercise in this chapter demonstrates the tasks necessary to implement the overall exception handling.

You Make the Call!

In this exercise, you will add the Global.asax file and default error web page and handle any exceptions as gracefully as possible. Follow these steps: 1. Proceed to the web project, and add the Global.asax file by right-clicking the project, choosing to add a new item, and then choosing the Global Application Class item. Then click the Add button; you ll see the following code within the file: <%@ Application Language="C#" %> <script runat="server"> void Application_Start(object sender, EventArgs e) { // Code that runs on application startup } void Application_End(object sender, EventArgs e) { // Code that runs on application shutdown } void Application_Error(object sender, EventArgs e)

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You can also initiate a call from your application, such as from a phone number you obtained through your own web service. To do this, simply craft an ACTION_DIAL Intent with a Uri of the form tel:NNNNN (where NNNNN is the phone number to dial) and use that Intent with startActivity(). This will not actually dial the phone; rather, it activates the dialer activity, from which the user can press a button to place the call. For example, let s look at the Phone/Dialer sample application. Here s the crude (but effective) layout:

This technique supplying an alternate layout to use for rows handles simple cases very nicely. However, it isn t sufficient when you have more-complicated scenarios for your rows, such as the following: Not every row uses the same layout (e.g., some have one line of text, others have two). You need to configure the widgets in the rows (e.g., different icons for different cases). In those cases, the better option is to create your own subclass of your desired Adapter, override getView(), and construct your rows yourself. The getView() method is responsible for returning a View, representing the row for the supplied position in the adapter data. For example, let s rework the preceding code to use getView() so we can have different icons for different rows in this case, one icon for short words and one for long words (from the FancyLists/Dynamic sample project at http://apress.com/): public class DynamicDemo extends ListActivity { TextView selection; String[] items={"lorem", "ipsum", "dolor", "sit", "amet", "consectetuer", "adipiscing", "elit", "morbi", "vel", "ligula", "vitae", "arcu", "aliquet", "mollis", "etiam", "vel", "erat", "placerat", "ante", "porttitor", "sodales", "pellentesque", "augue", "purus"};

{ // Code that runs when an unhandled error occurs } void Session_Start(object sender, EventArgs e) { // Code that runs when a new session is started } void Session_End(object sender, EventArgs e) { // Code that runs when a session ends. // Note: The Session_End event is raised only // when the sessionstate mode // is set to InProc in the Web.config file. // If session mode is set to StateServer // or SQLServer, the event is not raised. } </script> Notice that the Global.asax page does not have an associated code file or .cs file. Each of the methods included has associated comments about its individual functionality. 2. You ll focus on the Application_Error event for your exception-handling purposes. The first line of code to implement is to capture the last exception that occurred on the server side. You will accomplish this by adding the following code: void Application_Error(object sender, EventArgs e) { // Code that runs when an unhandled error occurs Exception ex = Server.GetLastError(); }

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