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he good news is that your brand-new shopping cart looks good and is fully functional. The bad news is that it doesn t allow the visitor to actually place an order, making it totally useless in the context of a production system. You ll deal with that problem in this chapter, in two separate stages. In the first part of the chapter, you ll implement the client-side part of the order-placing mechanism. More precisely, you ll add a Proceed to Checkout button onto the shopping cart control, which will allow the visitor to order the products in the shopping cart. In the second part of the chapter, you ll implement a simple orders administration page where the site administrator can view and handle pending orders. The code for each part of the site is presented in the usual way, starting with the database tier, continuing with the business tier, and finishing with the user interface.

The most powerful technique is to use a larger screen to get rid of activity transitions outright. For example, if you have a ListActivity where clicking an item brings up that item s details in a separate activity, consider supporting a large-screen layout where the details are on the same activity as the ListView (e.g., ListView on the left, details on the right, in a landscape layout). This eliminates the user having to constantly press the Back button to leave one set of details before viewing another. You will see this technique applied in the sample code presented in the following section.

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The entire order-placing system is related to the Proceed to Checkout button mentioned earlier. Figure 10-1 shows how this button will look after you update the ShoppingCart.aspx control in this chapter. Looking at the figure, the button looks boring for something that is the center of this chapter s universe. Still, a lot of logic is hidden behind it, so let s consider what you want to happen when the customer clicks that button. Remember that at this stage, it doesn t matter who places the order, but it s important to store information in the database about the products that were ordered. Basically, two things need to happen when the customer clicks the Proceed to Checkout button: First, the order must be stored somewhere in the database. You ll save the shopping cart s products to an order named BalloonShop Order nnn and then clear the shopping cart. Secondly, the customer must be redirected to a PayPal payment page where the customer pays the necessary amount for the order.

You start off by including the LiquidCrystal library and creating an lcd object: #include <LiquidCrystal.h> LiquidCrystal lcd(2, 3, 4, 5, 6, 7); // create an lcd object and assign the pins

name=(EditText)findViewById(R.id.name); result=(TextView)findViewById(R.id.result); Button btn=(Button)findViewById(R.id.format); btn.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { applyFormat(); } }); } private void applyFormat() { String format=getString(R.string.funky_format); String simpleResult=String.format(format, TextUtils.htmlEncode(name.getText().toString())); result.setText(Html.fromHtml(simpleResult)); } }

Note In this development stage, you still don t do the credit card transactions yourself, but use a thirdparty payment processor instead. You no longer need the PayPal shopping cart because you implemented your own in the previous chapter. Instead, as you ll see, you ll use the Single Item Purchases option of PayPal, which redirects the visitor directly to a payment page.

This time you are using Pins 2 and 3 for the RS and Enable on the LCD and Pins 4 to 7 for the data lines. Next, the pins for the touch screens are defined and the X and Y variables initialized: // Power connections #define Left 8 // #define Bottom 9 // #define Right 10 // #define Top 11 // Left (X1) to digital pin 8 Bottom (Y2) to digital pin 9 Right (X2) to digital pin 10 Top (Y1) to digital pin 11

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