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Because we want to reference this button from our Java code, we need to give it an identifier via the android:id attribute. We will cover this concept in greater detail in the next section. The remaining attributes are properties of this Button instance: android:text: Indicates the initial text to be displayed on the button face (in this case, an empty string). android:layout_width and android:layout_height: Tell Android to have the button's width and height fill the parent in this case, the entire screen. These attributes will be covered in greater detail in 6. Since this single widget is the only content in our activity, we need just this single element. Complex UIs will require a whole tree of elements, representing the widgets and containers that control their positioning. All the remaining chapters of this book will use the XML layout form whenever practical, so there are dozens of other examples of more complex layouts for you to peruse.

Figure 12-1. Page design to add a new Manufacturer 10. Add a Load event to the page and add the following code to the Page_Load event handler: protected void Page_Load(object sender, EventArgs e) { lblError.Visible = false;

#include <stdio.h> static const char id[] = "$Id: function.c 3 2003-11-16 02:57:30Z rooneg $"; void function (void) { printf ("hello world\n"); } $ svn pget svn:keywords main.c function.c

Many widgets and containers need to appear only in the XML layout file and do not need to be referenced in your Java code. For example, a static label (TextView) frequently needs to be in the layout file just to indicate where it should appear. These sorts of elements in the XML file do not need to have the android:id attribute to give them a name. Anything you do want to use in your Java source, though, needs an android:id. The convention is to use @+id/... as the id value, where the ... represents your locally unique name for the widget in question. In the XML layout example in the preceding section, @+id/button is the identifier for the Button widget. Android provides a few special android:id values, of the form @android:id/.... You will see some of these in various examples throughout this book.

if (Page.IsPostBack == false) { LoadManufacturer(); } } 11. Add the LoadManufacturer() method: private void LoadManufacturer() { // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString); try { // create the SELECT command string strQuery = "SELECT ManufacturerName, ManufacturerCountry, ManufacturerEmail, ManufacturerWebsite FROM Manufacturer WHERE ManufacturerID = @ManufacturerID"; SqlCommand myCommand = new SqlCommand(strQuery, myConnection); myCommand.Parameters.AddWithValue("@ManufacturerID", Request.QueryString["ManufacturerID"]); // open the connection myConnection.Open(); // execute the query SqlDataReader myReader = myCommand.ExecuteReader(); // if we have results then we need to parse them if (myReader.Read() == true) { txtName.Text = myReader.GetString( myReader.GetOrdinal("ManufacturerName")); txtCountry.Text = myReader.GetString( myReader.GetOrdinal("ManufacturerCountry")); txtEmail.Text = myReader.GetString( myReader.GetOrdinal("ManufacturerEmail")); txtWebsite.Text = myReader.GetString( myReader.GetOrdinal("ManufacturerWebsite")); // save values into viewstate ViewState["ManufacturerName"] = txtName.Text; ViewState["ManufacturerCountry"] = txtCountry.Text; ViewState["ManufacturerEmail"] = txtEmail.Text; ViewState["ManufacturerWebsite"] = txtWebsite.Text; }

$ ident program $Id: main.c 3 2003-11-16 02:57:30Z rooneg $ $Id: function.c 3 2003-11-16 02:57:30Z rooneg $ $ As you can see, with a little effort you can take the information Subversion makes available in its various keywords and place it in your final distribution, whether it consists of source code or binary executables, so that your users can extract all the information you ll need to know when diagnosing a problem.

// close the reader myReader.Close(); } catch (Exception ex) { lblError.Text = ex.Message; lblError.Visible = true; } finally { // always close the connection myConnection.Close(); } } 12. Add a Click event to the Update button and add the following code to the btnUpdate_Click event handler: protected void btnUpdate_Click(object sender, EventArgs e) { if (Page.IsValid == true) { SaveManufacturer(); } } 13. Add the SaveManufacturer() method: private void SaveManufacturer() { // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString); try { // create the UPDATE command string strQuery = "UPDATE Manufacturer SET ManufacturerName = @ManufacturerName, ManufacturerCountry = @ManufacturerCountry, ManufacturerEmail = @ManufacturerEmail, ManufacturerWebsite = @ManufacturerWebsite WHERE ManufacturerID = @ManufacturerID AND ManufacturerName = @originalManufacturerName AND ManufacturerCountry = @originalManufacturerCountry AND ManufacturerEmail = @originalManufacturerEmail AND ManufacturerWebsite = @originalManufacturerWebsite"; SqlCommand myCommand = new SqlCommand(strQuery, myConnection);

Given that you have painstakingly set up the widgets and containers in an XML layout file named main.xml stored in res/layout, all you need is one statement in your activity s onCreate() callback to use that layout: