commandpriority.java

用Eclipse开发J2me书籍的程序源码。

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class CommandPriority extends MIDlet {

    Display display;
    Form frmMain = new Form("命令按钮优先级演示");
    
    //命令按钮
    Command cmdScreen1 = new Command("SCREEN1", Command.SCREEN, 1);
    Command cmdScreen2 = new Command("SCREEN2", Command.SCREEN, 2);
    Command cmdScreen3 = new Command("SCREEN3", Command.SCREEN, 3);
    
    Command cmdItem1 = new Command("ITEM1", Command.ITEM, 1);
    Command cmdItem2 = new Command("ITEM2", Command.ITEM, 1);
    Command cmdItem3 = new Command("ITEM3", Command.ITEM, 1);
    
    Command cmdExit2 = new Command("EXIT2", Command.EXIT, 1);
    Command cmdExit1 = new Command("EXIT1", Command.EXIT, 2);
    
    public CommandPriority() {
        super();
        // TODO Auto-generated constructor stub
    }

    //同等级别的命令按钮，Priority决定重要程度，越小的重要程度越大，出现位置越靠前
    protected void startApp() throws MIDletStateChangeException {
        display = Display.getDisplay(this);
        frmMain.addCommand(cmdScreen3);
        frmMain.addCommand(cmdScreen2);
        frmMain.addCommand(cmdScreen1);
        
        frmMain.addCommand(cmdItem3);
        frmMain.addCommand(cmdItem2);
        frmMain.addCommand(cmdItem1);
        
        frmMain.addCommand(cmdExit1);
        frmMain.addCommand(cmdExit2);
        
        display.setCurrent(frmMain);

    }

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

    }

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

    }
}