choicegroupdemo.java

微型JAVA人编写的J2ME教材! 中带的原代码!简单易懂

//ChoiceGroupDemo.java
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
public class ChoiceGroupDemo
    extends MIDlet implements CommandListener {

    private final static Command CMD_EXIT = new Command("Exit", Command.EXIT, 
                                                        1);        
    private Display display;

    protected void startApp() {
        display = Display.getDisplay(this);

        Form mainForm = new Form("Choice Group");
        mainForm.append("These are the available choice group types");

        Image[] imageArray = null;
        try {
            Image duke = Image.createImage("/Icon.png");
            imageArray = new Image[] { duke, duke, duke, duke };
        } catch (java.io.IOException err) {
        }

        String[] stringArray = {
            "Option A", "Option B", "Option C", "Option D"
        };

        ChoiceGroup[] groups = {
            new ChoiceGroup("Exclusive", ChoiceGroup.EXCLUSIVE, stringArray, 
                            imageArray), 
            new ChoiceGroup("Multiple", ChoiceGroup.MULTIPLE, stringArray, 
                            imageArray), 
            new ChoiceGroup("Pop-Up", ChoiceGroup.POPUP, stringArray, 
                            imageArray)
        };

        for (int iter = 0; iter < groups.length; iter++) {
            mainForm.append(groups[iter]);
        }
        mainForm.addCommand(CMD_EXIT);
        mainForm.setCommandListener(this);
        display.setCurrent(mainForm);
    }

    public void commandAction(Command c, Displayable d) {
        if (c == CMD_EXIT) {
            destroyApp(false);
            notifyDestroyed();
        }
    }

    protected void destroyApp(boolean unconditional) {
    }

    protected void pauseApp() {
    }
}