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Building a content provider is probably the most complicated and tedious task in all of Android development. There are many requirements of a content provider, in terms of methods to implement and public data members to supply. And, until you try using your content provider, you have no great way of telling if you did it correctly (versus, say, building an activity and getting validation errors from the resource compiler). That being said, building a content provider is of huge importance if your application wishes to make data available to other applications. If your application is keeping its data solely to itself, you may be able to avoid creating a content provider, and just access the data directly from your activities. But if you want your data to possibly be used by others for example, you are building a feed reader and you want other programs to be able to access the feeds you are downloading and caching then a content provider is right for you. This chapter shows some sample bits of code from the ContentProvider/ConstantsPlus application. This is the same basic application as was first shown back in 22, but rewritten to pull the database logic into a content provider, which is then used by the activity.

First, make sure your Arduino is powered off by unplugging it from the USB cable. Now, take the required parts and connect them as shown in Figure 5-3. Again, check the circuit thoroughly before powering it up. The L293D gets VERY hot when in use. Therefore, a heatsink is essential. Glue the heatsink to the top of the chip using a strong epoxy glue. The larger the heatsink, the better. Be warned that the temperature can get hot enough to melt the plastic on a breadboard or any wires touching it. Do not touch the heatsink as you may burn yourself. Do not leave the circuit powered up and unattended in case it overheats. It may be prudent to use stripboard instead of a breadboard for this project to save damaging your breadboard due to heat.

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protected void placeOrderButton_Click(object sender, EventArgs e) { // Store the total amount because the cart // is emptied when creating the order decimal amount = ShoppingCartAccess.GetTotalAmount(); // Create the order and store the order ID string orderId = ShoppingCartAccess.CreateOrder(); // Create the PayPal redirect location string redirect = ""; redirect += "https://www.paypal.com/xclick/business=youremail@server.com"; redirect += "&item_name=BalloonShopOrder " + orderId; redirect += "&item_number=" + orderId; redirect += "&amount=" + String.Format("{0:c} ", amount); redirect += "&return=http://www.YourWebSite.com"; redirect += "&cancel_return=http://www.YourWebSite.com"; // Redirect to the payment page Response.Redirect(redirect); } } 3. Add the following class definition to BalloonShop.css: .InfoText { font-family: Verdana, Helvetica, sans-serif; font-size: 12px; } 4. Modify web.config as follows: <!-- Only existing customers can access Checkout.aspx --> <location path="Checkout.aspx"> <system.web> <authorization> <allow roles="Customers" /> <deny users="*" /> </authorization> </system.web> </location> 5. Modify ShoppingCart.aspx.cs as follows: // redirect to the checkout page protected void checkoutButton_Click(object sender, EventArgs e) { string redirect = "Checkout.aspx"; // Redirect to the checkout page Response.Redirect("Checkout.aspx"); }

Figure 5-3. The circuit for Project 16 (see insert for color version)

6. Log in, edit your customer details, and place an order via the shopping cart page. If your details are correct, you should be able to click Proceed to Checkout; otherwise, you ll have to add valid customer details before proceeding.

As discussed in the previous chapter, the content Uri is the linchpin behind accessing data inside a content provider. When using a content provider, all you really need to know is the provider s base Uri. From there, you can run queries as needed, or construct a Uri to a specific instance if you know the instance identifier. However, when building a content provider, you need to know a bit more about the innards of the content Uri.

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