navigatemidlet.java

j2me的程序

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class NavigateMIDlet extends MIDlet implements CommandListener {

    int stepX;
    int stepY;

    private Command leftCommand;
    private Command rightCommand;
    private Display display;
    Displayable nd;

    Image image = null;

    public NavigateMIDlet() {
        try {
     //       image= Image.createImage("/multiJavaPlatform.png");
            image= Image.createImage("/MO_mort_illustration.png");
        }
        catch(Exception e) {
        }

	   Display display = Display.getDisplay(this);

       nd = new NavigateCanvas(image);
       stepX = ((NavigateCanvas)nd).getWidth()/4;
       stepY = ((NavigateCanvas)nd).getHeight()/4;
       leftCommand = new Command ("<左", Command.SCREEN, 1);
       rightCommand = new Command ("右>", Command.SCREEN, 1);

       nd.addCommand(rightCommand);
       nd.addCommand(leftCommand);
       nd.setCommandListener(this);
       display.setCurrent(nd);
    }

    public void startApp(){
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }
    public void commandAction(Command c, Displayable d) {
	    if(d==nd && c==leftCommand) {
            ((NavigateCanvas)nd).steppingXY(stepX,0);
            ((NavigateCanvas)nd).repaint();
        }
        else if(d==nd && c==rightCommand) {
            ((NavigateCanvas)nd).steppingXY(-stepX,0);
            ((NavigateCanvas)nd).repaint();
        }
    }
}