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De ne variables to reference the Username text box, the Password text box, and the error message label 3 Develop the code to search through a UserControl skin le and set up references to the Username and Password text boxes, as well as the Error Message label The code also needs to add a handler to the skin s Login button to execute the login business logic when a user clicks on the Login button 4 Create UserControl skins for the two different login styles The references to the Username and Password text boxes are used by the business logic to acquire the username and password that the user entered into the control These credentials are then authenticated against the user list If authentication fails, the label reference should be used to output a message to the user regarding the issue.

The configuration uses a FileAppender along with XMLLayout to format the logging information. Executing the program with this configuration file will write the formatted logging information to the xmlLayout.xml file. The content of the file looks similar to the following: <log4j:event logger="com.apress.logging.log4j" timestamp="1035061552691" level="INFO" thread="main"> <log4j:message><![CDATA[The sqrt value: 4.69041575982343]]></log4j:message> <log4j:NDC><![CDATA[22.0]]></log4j:NDC> <log4j:locationInfo class="com.apress.logging.log4j.LayoutDemo" method="computeSquareRoot" file="LayoutDemo.java" line="35"/> </log4j:event> <log4j:event logger="com.apress.logging.log4j" timestamp="1035061552711" level="INFO" thread="main"> <log4j:message><![CDATA[The sqrt value: 6.6332495807108]]></log4j:message> <log4j:NDC><![CDATA[44.0]]></log4j:NDC> <log4j:locationInfo class="com.apress.logging.log4j.LayoutDemo" method="computeSquareRoot" file="LayoutDemo.java" line="35"/> </log4j:event> As is evident, the XML output is a series of <log4j:event> elements containing child elements to present the logging information. The following code snippet shows how to include this information in a well-formed XML file. < xml version="1.0" > <!DOCTYPE log4j:eventSet SYSTEM "log4j.dtd" [<!ENTITY logEntity SYSTEM "xmlLayout.xml">]> <log4j:eventSet version="1.2" xmlns:log4j="http://jakarta.apache.org/log4j/"> &logEntity; </log4j:eventSet> At first sight, this might seem confusing. But the rationale behind it is that it makes the Layout object rendering the logging message into XML format and the Appender object using this Layout independent of each other. To further illustrate, let s say that you are writing a custom appender. You want the appender to include your company information header with every logging output. You also want the logging information to be published in XML format. In such scenarios, you will override the doAppend() method in your custom appender to write the logging information into an XML file. Also, you can include a standard header containing your company information and can still use the existing XMLLayout object to format the logging information in its own style. You can then include a reference to the file that the XMLLayout object produced as an external ENTITY within your XML file containing your company information. Clearly, you have achieved the flexibility of including the XML logging information from the XMLLayout object as an ELEMENT of another XML content.

} return false; } /** * Key Released */ @Override public boolean onKeyUp(int keyCode, KeyEvent event) { // Ignore MENU if (keyCode == KeyEvent.KEYCODE_MENU) return false; try { int sym = ScanCodes.keySymToScancode(keyCode); Natives.keyRelease(sym); } catch (UnsatisfiedLinkError e) { System.err.println(e.toString()); } return false; } /** * Touch event */ @Override public boolean onTouchEvent(MotionEvent event) { try { if (event.getAction() == MotionEvent.ACTION_DOWN) { // Fire on tap R-CTL Natives.keyPress(ScanCodes.sc_Control); } else if (event.getAction() == MotionEvent.ACTION_UP) { Natives.keyRelease(ScanCodes.sc_Control); } else if (event.getAction() == MotionEvent.ACTION_MOVE) { // Motion event } return true; } catch (UnsatisfiedLinkError e) { // Should not happen! Log.e(TAG, e.toString()); return false; } }

As for the login skins, both must contain a text box control for the username, a text box control for the password, a label to display error messages, and a button to submit the login information You can include additional markup in the UserControl skin as long as the skin contains the four previously mentioned elements Each skin must also adhere to the expected ID values for those controls For example, the skinned control may expect the Username text box to be named txtUserName, so the UserControl skins are expected to identify the Username text box accordingly..