?? attributesmidlet.java
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package ora.ch5;import javax.microedition.lcdui.Canvas;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Form;import javax.microedition.lcdui.Graphics;import javax.microedition.lcdui.StringItem;import javax.microedition.midlet.MIDlet;public class AttributesMIDlet extends MIDlet implements CommandListener { // The MIDlet's Display object private Display display; // Flag indicating first call of startApp protected boolean started; // Exit command private Command exitCommand; protected void startApp() { if (!started) { display = Display.getDisplay(this); Canvas canvas = new DummyCanvas(); // Build a Form displaying the Display // and Canvas attributes. Form form = new Form("Attributes"); exitCommand = new Command("Exit", Command.EXIT, 0); form.addCommand(exitCommand); boolean isColor = display.isColor(); form.append(new StringItem(isColor ? "Colors: " : "Grays: ", String.valueOf(display.numColors()))); form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth()))); form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight()))); form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents()))); form.append(new StringItem("Motion? ", String.valueOf(canvas.hasPointerMotionEvents()))); form.append(new StringItem("Repeat? ", String.valueOf(canvas.hasRepeatEvents()))); form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered()))); form.setCommandListener(this); display.setCurrent(form); started = true; } } protected void pauseApp() { } protected void destroyApp(boolean unconditional) { } public void commandAction(Command c, Displayable d) { if (c == exitCommand) { // Exit. No need to call destroyApp // because it is empty. notifyDestroyed(); } } // A Canvas that has no painting logic static class DummyCanvas extends Canvas { protected void paint(Graphics g) { // Do nothing } }}
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