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int MeasureNoise () { int n; //estimate ambient noise by averaging 10 readings n = 0; repeat(10) { n += Sensor(MIC); Wait(20); } n /= 10; return n; } // this function waits for one of three events: // - someone clicks the orange button // - the timer elapses // - a loud sound pulse occurs // and returns a number to describe which event // occurred first short WaitEvent(short noise, unsigned long timer) { short event = 0; while ( event==0 ) { if (ButtonPressed(BTNCENTER,true)==1) { event = E_EXIT; while(ButtonPressed(BTNCENTER,true)==1); TextOut(5,LCD_LINE6,"Button"); } else if (CurrentTick() > timer + E_TIMEOUT) { event = E_ELAPSE; TextOut(5,LCD_LINE6,"Elapse");

Another trick to save space in the JAR file is to modify the color of an image if the same image is used with more than one coloration. In the Dungeon example, all of the menu items are written in black. However, as the user moves up and down the menu to select a choice, there has to be some way to indicate which item is currently highlighted. One way to do this is to change the color of the focused item in the Dungeon example it will be bright blue. It wouldn t be terribly efficient to store black versions of all of the labels in the JAR and also blue versions of the exact same images. So in the Dungeon example, for each label image, you create a second image, swapping out the black color and exchanging it with blue. In the code for the menu, you ll see that it s convenient to have each menu item be a Sprite so that in a single method call (setCell()) you can switch from the unfocused (black) image to the focused (blue) image. And since a Sprite requires all of its cells to be read from a single image object, it s necessary to create a new image object that has both colored versions together, as seen in Listing 10-4. Listing 10-4. ColorChanger.java package net.frog_parrot.util; import javax.microedition.lcdui.*;

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Figure 11-2. Newly added Security Application Block The AuthorizationFactory class is one of the two main abstraction points for the Security Application Block. After it has been configured, the factory class can be queried for a provider, which can be used to determine if a user can access a specific operation.

CHAPTER 8 JOHNNXT IS ALIVE!

The AzMan provider and authorization rule provider are supplied with the Security Application Block. The following sections describe how to configure them through the Configuration Console and then use them in the demo application.

/** * This class modifies the colors and transparency * of an image. * * @author Carol Hamer */ public class ColorChanger { //--------------------------------------------------------// Constants /** * A color constant. */ public static int TRANSPARENT_WHITE = 0x00ffffff; /** * A color constant. */ public static int OPAQUE = 0xff000000; //--------------------------------------------------------// utilities /** * This method changes the transparency of the Image. * * @param image the source Image to modify * @param color the color value that the new transparency * is read from in ARGB. The RGB part is ignored. */ public static Image modifyTransparency(Image image, int color) { int transparency = color & OPAQUE; int width = image.getWidth(); int height = image.getHeight(); int[] imageData = new int[width * height]; image.getRGB(imageData, 0, width, 0, 0, width, height); for(int i = 0; i < imageData.length; i++) { // only modify pixels that aren't already // fully transparent: if((imageData[i] & OPAQUE) != 0) { imageData[i] = transparency + (imageData[i] & TRANSPARENT_WHITE); } } return(Image.createRGBImage(imageData, width, height, true)); }

With the Security Application Block added to the demo application, you can now set up the application to use the AzMan provider as an authorization source. Follow these steps to configure the AzMan provider: 1. Right-click the Authorization node of the Security Application Block and select New AzMan Provider. 2. Set the Store Location property to the location of the AzMan XML file. 3. Change the Application property to the name of the application that you created in the AzMan console. Figure 11-3 shows the configuration in the Configuration Console.

} else if (Sensor(MIC)>noise+50) { event = E_TRIGGER; TextOut(5,LCD_LINE6,"*"); until(Sensor(MIC)<noise+40); Wait(10); } } ClearLine(6); return event; } // this subroutine shows the actual state of the arms FSM sub ShowArmsState(short state, short line) { ClearLine(line); switch(state) { case A_FOLDED: TextOut(5,(8-line)*8,"Folded"); break; case A_UP: TextOut(5,(8-line)*8,"Up"); break; case A_CLOSED: TextOut(5,(8-line)*8,"Hands closed"); break; case A_OPEN: TextOut(5,(8-line)*8,"Hands open"); break; case A_ROTATE: TextOut(5,(8-line)*8,"Wrist rotate"); break; } } // this subroutine manages the arms FSM, to command the arms with // sound pulses sub J5_Manipulation() { unsigned long soundFSMtimer; short count = A_FOLDED; short state = FSM_IDLE; short event; bool exit; short noise; ClearScreen(); TextOut(0,LCD_LINE1,"Arms control"); // measure background noise noise = MeasureNoise(); Remote(A_FOLDED,ACK_DONE); // the sound counting FSM is implemented as follows until(exit) { if (state == FSM_IDLE) {

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