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As with an activity, the main entry point to a content provider is onCreate(). Here you can do whatever initialization you want. In particular, here is where you should lazy-initialize your data store. For example, if you plan on storing your data in such-and-so directory on an SD card, with an XML file serving as a table of contents, you should check if that directory and XML file are there and, if not, create them so the rest of your content provider knows they are out there and available for use. Similarly, if you have rewritten your content provider sufficiently to cause the data store to shift structure, you should check to see what structure you have now and adjust it if what you have is out-of-date. You don t write your own installer program and so have no great way of determining if, when onCreate() is called, this is the first time ever for the content provider, the first time for a new release of a content provider that was upgraded in place, or just a normal startup.

You can pop up a menu to add a new constant, which brings up a dialog to fill in the name and value of the constant, as shown in Figure 22 2.

In this chapter, you examined the major risk factors of entering into e-commerce. Along with noting the risks, I offered solutions and workarounds so you can be as prepared as possible and incorporate all the appropriate security. If you are a die-hard programmer or member of a development team that builds e-commerce systems, you re in luck the next chapter will focus on the architecture and on building the system.

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The struct added, PayPalInformation, contains only one common object or class. More specifically, it is that of the Orders class. This essentially means you will be able to populate an Orders class that is part of the PayPalInformation struct. 4. Now that you have the PayPalInformation struct completed, you need to utilize it by adding it to the ProcessDirectPayment method as a parameter. The method will now resemble the following: public void ProcessDirectPayment( PayPalInformation paypalinformation ) { } 5. Moving along, you can now begin to populate the credit card details needed to be eventually used in the ProcessDirectPayment method. Add the following code: // Set CreditCard info. DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard = new CreditCardDetailsType(); DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard. CreditCardNumber = paypalinformation.Order.CreditCard.Number; DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard. CreditCardType = ( CreditCardTypeType ) StringToEnum

The constant is then added to the list. A long-tap on an existing constant will bring up a context menu with a Delete option, which, after confirmation, will delete the constant.

If your content provider uses SQLite for storage, you can detect if your tables exist by querying on the sqlite_master table. This is useful for lazy-creating a table your content provider will need. For example, here is the onCreate() method for Provider, from the ContentProvider/ Constants sample application available in the Source Code section of http://apress.com: @Override public boolean onCreate() { db=(new DatabaseHelper(getContext())).getWritableDatabase(); return (db == null) false : true; } While that doesn t seem all that special, the magic is in the private DatabaseHelper object, described in the chapter on database access.

( typeof( CreditCardTypeType ) , paypalinformation.Order.CreditCard.CardType ); DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard.CVV2 = paypalinformation.Order.CreditCard.SecurityCode; DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard.ExpMonth = paypalinformation.Order.CreditCard.ExpMonth; DoDirectPmtReqType.DoDirectPaymentRequestDetails.CreditCard.ExpYear = paypalinformation.Order.CreditCard.ExpYear;

SQLite, as the name suggests, uses a dialect of SQL for queries (SELECT), data manipulation (INSERT, et. al.), and data definition (CREATE TABLE, et. al.). SQLite has a few places where it deviates from the SQL-92 standard, as is common for most SQL databases. The good news is that SQLite is so space-efficient that the Android runtime can include all of SQLite, not some arbitrary subset to trim it down to size. A big difference between SQLite and other SQL databases is the data typing. While you can specify the data types for columns in a CREATE TABLE statement, and SQLite will use those as a hint, that is as far as it goes. You can put whatever data you want in whatever column you want. Put a string in an INTEGER column Sure, no problem! Vice versa That works, too! SQLite refers to this as manifest typing, as described in the documentation:

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