commandactionhandle1.java

用Eclipse开发J2me书籍的程序源码。

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.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class CommandActionHandle1 extends MIDlet implements CommandListener {
	Display display;
	Form frmMain = new Form("命令按钮事件处理演示");
	
	static final String EXIT_STR = "退出";
	static final String SCREEN1_STR = "SCREEN1";
	static final String SCREEN2_STR = "SCREEN2";
	static final String SCREEN3_STR = "SCREEN3";
	
	public CommandActionHandle1() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void startApp() throws MIDletStateChangeException {
		display = Display.getDisplay(this);
		frmMain.addCommand(new Command(SCREEN3_STR, Command.SCREEN, 3));
		frmMain.addCommand(new Command(SCREEN2_STR, Command.SCREEN, 2));
		frmMain.addCommand(new Command(SCREEN1_STR, Command.SCREEN, 1));
		
		frmMain.addCommand(new Command(EXIT_STR, Command.EXIT, 1));
		frmMain.setCommandListener(this);
		
		display.setCurrent(frmMain);
    }

    protected void pauseApp() {
        // TODO Auto-generated method stub

    }

    protected void destroyApp(boolean arg0) 
        throws MIDletStateChangeException {
        // TODO Auto-generated method stub

    }

    //处理命令按钮事件
    public void commandAction(Command c, Displayable d) {
        //另外一种处理方式
        String s = c.getLabel();
        if (s.equals(EXIT_STR)) {
            notifyDestroyed();
        } else {
            frmMain.append(s+ "按钮被按下\n");
        }
    }

}