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A problem that arises when using a third-party payment processor is that the customer can change her mind and cancel the order while at the checkout page. This can result in orders that are saved to the database (the order is saved before the page is redirected to the payment page), but for which payment wasn t completed. This makes it obvious that a paymentconfirmation system is necessary, along with a database structure able to store status information about each order. The confirmation system that you ll implement is simple. Every payment processor, including PayPal, can be instructed to send a confirmation message after a payment has been processed. The site administrator can manually check, in the administration page, which orders have been paid for. The orders for which the payment has been confirmed are known as verified orders. You ll see later in this chapter how to manage them in the orders management part of the site.

The string resource manipulation can be found in applyFormat(), which is called when the button is clicked. First, we get our format via getString() (something we could have done at onCreate() time for efficiency). Next, we format the value in the field using this format, getting a String back, since the string resource is in entity-encoded HTML. Note the use of TextUtils.htmlEncode() to entity-encode the entered name, in case someone decides to use an ampersand or something. Finally, we convert the simple HTML into a styled text object via Html.fromHtml() and update our label. When the activity is first launched, we have an empty label, as shown in Figure 20 1.

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// Analog connections #define topInput 0 // Top (Y1) to analog pin 0 #define rightInput 1 // Right (X2) to analog pin 1 int coordX = 0, coordY = 0; In the setup routine, you begin the LCD object and set it to 16 columns, 2 rows, then clear the display so you re ready to begin: lcd.begin(16, 2); // Set the display to 16 columns and 2 rows lcd.clear(); In the main loop, you have an if statement as you did in Project 33, but this time you need to check that the coordinates touched are within a rectangle that defines the boundary of each button. If the coordinate is within the relevant button boundary, the appropriate number is displayed on the LCD. If the C button is pressed, the display is cleared; if the E button is pressed, the scrollLCD function is called. if (touch()) { if ((coordX>110 if ((coordX>110 if ((coordX>110 if ((coordX>330 if ((coordX>330 if ((coordX>330 if ((coordX>490 if ((coordX>490 if ((coordX>490 if ((coordX>760 if ((coordX>760 if ((coordX>760 delay(250); }

Note PayPal and its competitors offer automated systems that notify your web site when a payment has been completed or canceled. However, in this book, we don t aim at visiting the intimate details of any of these payment systems you ll need to do your homework and study the documentation of the company you choose. The PayPal Instant Payment Notification manual can be downloaded at https://www.paypal. com/en_US/pdf/PP_WebsitePaymentsStandard_IntegrationGuide.pdf.

Android supports images in the PNG, JPEG, and GIF formats. GIF is officially discouraged, however. PNG is the overall preferred format. Images can be used anywhere you require a Drawable, such as the image and background of an ImageView. Using images is simply a matter of putting your image files in res/drawable/ and then referencing them as a resource. Within layout files, images are referenced as @drawable/... where the ellipsis is the base name of the file (e.g., for res/drawable/foo.png, the resource name is @drawable/foo). In Java, where you need an image resource ID, use R.drawable. plus the base name (e.g., R.drawable.foo). To demonstrate, let s update the previous example to use an icon for the button instead of the string resource. This can be found as Resources/Images. First, we slightly adjust the layout file, using an ImageButton and referencing a Drawable named @drawable/icon:

Now that you have an idea of what the Proceed to Checkout button will do, the next major concerns are what product order information to store in the database and how to store it. As you saw in the previous chapters, deciding how to store information gives you have a better idea of how the whole system works.

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Two kinds of order information need to be stored in the database when a customer places an order: The general information about the order, including the date the order was created, the status of the order, and a few other details. The products that belong to that order and their quantities. You ll need to add two tables in the database to store this information.

< xml version="1.0" encoding="utf-8" > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:id="@+id/format"

coordX<300) coordX<300) coordX<300) coordX<470) coordX<470) coordX<470) coordX<710) coordX<710) coordX<710) coordX<940) coordX<940) coordX<940)

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