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As mentioned in the previous exercise, the images for the products in the database are stored as binary data. Since the data for the images is in a binary format, you cannot simply set a path to the images in a directory on the file system. You need to have the binary data processed and ultimately displayed as an image on the web page. I touched upon this concept in the previous exercise when you added the ASHX file, better known as an HTTP handler or generic handler. ASHX files implement the IHttpHandler interface and have one main benefit over using a standard web form or ASPX page. Basically, ASHX files have the ability to access the HttpContext while at the same time do not have to inherit from the Page class; thus, they don t require the additional overhead of displaying the images for the product category. More specifically, all the related HTTP information is readily available regarding the request that is received in the page. ASHX files have two methods, as you saw when you added the ASHX code to the project. These methods are ProcessRequest and IsReusable. Lastly, another great benefit to using these files to display your images is that you will not be required to register the file extension in Internet Information Services (IIS) or in your project s Web.config file. You can simply add them to your project, and everything is good to go. The following exercise will show you the specifics.

The Cancel button is set to be to the left of the OK button (android:layout_toLeft = "@id/ok") and have its top aligned with the OK button (android:layout_alignTop = "@id/ok") Of course, that 15px of padding is a bit of a hack A better solution, for Android 16 and beyond, is to anchor the EditText to the top of the screen and have the TextView say it is aligned with the EditText widget s baseline, as shown in the following example (In Android 15 and earlier, this was not possible, because of the single-pass rule interpretation mentioned earlier).

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This exercise shows how to implement the product images in the HTTP handler and ASHX page you added to the web project in the previous exercise. Follow these steps: 1. Proceed to the generic handler, the ImageViewer.ashx file, that you added in the previous exercise. You need to modify the template code that was added. As mentioned, you need to keep the two methods; however, you will delete the code from within the ProcessRequest method, and you can keep the IsReusable method as is:

Rather than building your activity s options menu during onCreate(), the way you wire up the rest of your UI, you instead need to implement onCreateOptionsMenu(). This callback receives an instance of Menu.

<%@ WebHandler Language="C#" Class="ImageViewer" %> using System; using System.Web; public class ImageViewer : IHttpHandler { public void ProcessRequest ( HttpContext context ) { } public bool IsReusable { get { return false; } } } 2. For this exercise, you will focus on the ProcessRequest method to eventually display the individual image. The first step in this method is to retrieve the query string for the image ID from the HttpContext being passed into the method, as shown in the following code: <%@ WebHandler Language="C#" Class="ImageViewer" %> using System; using System.Web; using LittleItalyVineyard.Common; public class ImageViewer : IHttpHandler { public void ProcessRequest ( HttpContext context ) { Product product = new Product(); product.ImageID = int.Parse ( context.Request.QueryString[ "ImageID" ] ); } public bool IsReusable { get { return false; } } } 3. You now have an instantiated Product class that will set the ImageID property in the code that will hold the ID for the image you need to query from the database. The next step is to implement functionality to retrieve the binary data from the database according to the image ID. You accomplish this by implementing the necessary code in the architecture to eventually retrieve the binary data of the image. Therefore, let s first add the namespace for the business logic layer to the code:

< xml version="1.0" encoding="utf-8" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="5px"> <TextView android:id="@+id/label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="URL:" android:layout_alignBaseline="@+id/entry" android:layout_alignParentLeft="true"/> <EditText android:id="@id/entry" android:layout_width="fill_parent" android:layout_height="wrap_content"

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