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Undoubtedly, after you launch your e-commerce application, you will find that some errors are occurring. You might luck out and find these errors in the testing phase, but that is certainly not the norm. The main reason for this is that you can test only to a certain degree to find any complications in your application. Therefore, it is important to watch for any of these complications after the application is launched so you can diagnose them quickly, make the corrections, and redeploy the updated source code. In the case study, you added some basic logging of any exceptions that occur within the application. However, you will need to check this log frequently so you can determine whether errors have been encountered. An excellent addition is to create an e-mailing feature for the exceptions so that you do not have to check the log manually all the time.

The fields are updated on each onResume():

Of course, content providers would be astonishingly weak if you couldn t add or remove data from them, only update what is there. Fortunately, content providers offer these abilities as well. To insert data into a content provider, you have two options available on the ContentProvider interface (available through getContentProvider() to your activity): Use insert() with a collection Uri and a ContentValues structure describing the initial set of data to put in the row Use bulkInsert() with a collection Uri and an array of ContentValues structures to populate several rows at once

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As your application lives longer and expands, the goal is to gain more and more traffic for the e-commerce site. Knowing this, you will probably find some bottlenecks in certain areas that you ll want to address. Or you might come to the conclusion that you need to scale the hosting platform to accommodate the increased volumes of traffic. Although this is a great problem to have because it will potentially mean more sales for the company, it will require some additional work. As a result, you will need to make some optimizations to your application. Optimizations can take many forms, such as additional caching of data, stress testing of the overall application, or even the introduction of a new feature, such as SQL cache invalidation. You can cache data within the code in the form of retaining information on the server. As the product catalog grows, this is a prime candidate for implementing SQL Server caching. SQL caching invalidation is a new feature within the .NET Framework 2.0 and SQL Server 2005 where you can have the local machine or client cache information keep displaying the cached data until a value in a specified table occurs. This is a great technique for the product catalog so that if there are no alterations made to the overall catalog, the cached information will be displayed when requested by a customer. The following exercise shows how to set up the SQL caching invalidation functionality.

public void onResume() { super.onResume(); SharedPreferences prefs=PreferenceManager .getDefaultSharedPreferences(this); checkbox.setText(new Boolean(prefs .getBoolean("checkbox", false)) .toString()); ringtone.setText(prefs.getString("ringtone", "<unset>")); }

Accepting payments when selling your products online will undoubtedly need to be in an electronic form In other words, you will need to accept credit cards and possibly even electronic checks This has become the standard practice of paying for merchandise when buying online Your customers will expect to use this payment method However, people may have a certain fear of accepting credit card payments, and most important, you will need to assure your customers that your system is taking all the necessary prevention methods to protect their data when ordering from your company online To protect your customers credit card information, you need to transmit all sensitive data over a secure connection You can implement this secure connection with a security certificate, more commonly referred to as a Secure Sockets Layer (SSL) certificate.

This means that the fields will be updated when the activity is opened and after the preferences activity is left (e.g., via the back button), as shown in Figure 21 3.

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