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application employs private SharedPreferences to accomplish this. Why Despite the fact that we re largely ignoring security for this sample application, using private SharedPreferences means that other applications can t casually access this potentially important data. For example, we presently use only an identifier (let s call it an email address for simplicity) and a server URL in this application. But we might also include a password or a PIN in a production-ready application, so keeping this data private is a good practice. The Prefs class can be described as a helper or wrapper class. This class wraps the SharedPreferences code and exposes simple getter and setter methods, specific to this application. This implementation knows something about what we re trying to accomplish, so it adds value with some default values as well. Let s look at the following listing to see how our Prefs class is implemented.

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package com.msi.manning.UnlockingAndroid; // multiple imports omitted for brevity, see full source code public class Prefs { SharedPreferences object private SharedPreferences _prefs = null; private Editor _editor = null; Implement private String _useremailaddress = "Unknown"; Handler private String _serverurl = "http://android12.msi-wireless.com/getjoblist.php"; Default public Prefs(Context context) { values _prefs = context.getSharedPreferences( "PREFS_PRIVATE", Initialize Context.MODE_PRIVATE); SharedPreferences _editor = _prefs.edit(); } public String getValue(String key,String defaultvalue){ if (_prefs == null) return "Unknown"; Generic return _prefs.getString(key,defaultvalue); set/get } methods public void setValue(String key,String value) { if (_editor == null) return; _editor.putString(key,value); Extract } email value public String getEmail(){ if (_prefs == null) return "Unknown"; _useremailaddress = _prefs.getString("emailaddress","Unknown"); return _useremailaddress; } public void setEmail(String newemail) { Set email if (_editor == null) return; value _editor.putString("emailaddress",newemail); } ... (abbreviated for brevity) public void save() { Save if (_editor == null) return; preferences _editor.commit(); } }

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Although ASP was created to use VBS commands by default, you can use other languages if you wish. Of course, any .dll for these languages has to be installed and you would have to include code that tells ASP what language you are using. You can do this by adding a Language attribute to a script tag, as shown in Listing 9-2. The first line of this sample indicates that this script block will use JavaScript instead of VBScript. Listing 9-2. Using the Script Tag <SCRIPT LANGUAGE="javascript" RUNAT="Server"> //Make some variables var objconn, objrs, strquery, strconnection; //Create an ADO Connection object objconn = server.createobject("adodb.connection"); //Connect to the DB strconnection = "dsn=pubs;database=pubs;uid=sa;pwd=password;" objconn.open (strconnection); //Get some data from the DB strquery = "select title, price from titles order by title"; objrs = objconn.execute(strquery); </SCRIPT> You may have noticed that this code creates an object using the adodb.connection class. This class is located in an additional library file called ADO.dll. This particular .dll is installed as part of many Microsoft products and is likely installed on any PC you use. Here, we created a variable called objconn and set a reference to a connection object made by the ASP method server.createobject(). This method allows you to create objects from classes not normally mapped by the ASP.dll. In this case, it is utilizing ADO s Connection class, but it can also be used with classes found in other .dlls. The ability for the ASP.dll to work with another .dll is governed by the specifications of the Component Object Model (COM). You will learn more about COM objects and how .NET can interoperate with them in 10.

To persist the application s settings data, you employ a SharedPreferences object B. To manipulate data within the SharedPreferences object, here named _prefs, you use an instance of the Editor class C. This snippet employs some default settings values D, which are appropriate for your application. The Prefs() constructor E does the necessary housekeeping so you can establish your private SharedPreferences object, including using a passed-in Context instance. The Context class is necessary because the SharedPreferences mechanism relies on a Context for segregating data. This snippet shows a pair of set and get methods that are generic in nature F. The getEmail G and setEmail methods H are responsible for manipulating the email setting value. The save() method I invokes a commit() on the Editor, which persists the data to the SharedPreferences store. Now that you have a feel for how this important preference data is stored, let s return to examine the code of FieldService.java.

Most web applications today have connections to a database on some, if not all, of their pages. When using this option, the database stores the dynamic content of the web pages, the web server will process the data, and the web client will present the data to the user. These types of web applications use three distinct pieces of software divided into three distinct layers, or tiers. The first layer is for presenting the results to the user, the second is for processing the instructions, and the third is for holding the data (see Figure 9-6).

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