commandlistenertest1.java

手机UI例程1.0

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

public class CommandListenerTest1 extends MIDlet implements CommandListener{
    private Display display;
    private Command changeCommand= new Command("Change",Command.OK,1);
    private Form s1,s2;
 
    public CommandListenerTest1() {
        display=Display.getDisplay(this);
        s1 = new Form("Screen1");
        s1.addCommand(changeCommand);
        s1.setCommandListener(this);
        
        s2 = new Form("Screen2");
        s2.addCommand(changeCommand);
        s2.setCommandListener(this);               
    }
    
    public void startApp() throws MIDletStateChangeException {
        display.setCurrent(s1);
    }

    /**
     * Pause the MIDlet
     */
    public void pauseApp() {
    }

    /**
     * Called by the framework before the application is unloaded
     */
    public void destroyApp(boolean unconditional) {
        s1=null;
        s2=null;
	display=null;
    }
    
    public void commandAction(Command c,Displayable d) {
        if(d==s1 && c==changeCommand) {
            display.setCurrent(s2);
            System.out.println("changed to screen 2");
        }
        else if(d==s2 && c==changeCommand) {
            display.setCurrent(s1);
            System.out.println("Changed to screen 1");
        }
    }
}