gaugedemo3.java

J2ME MIDP 2.0 无线设备编程的一些源码

//gaugeDemo3.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import itemex.*;

public class gaugeDemo3 extends MIDlet implements CommandListener 
{
    private Command exitCommand, aCommand1, aCommand2;
    private Form form;
    private GaugeAlert alert;
    public gaugeDemo3()
    {
        exitCommand =new Command("Exit",Command.EXIT,1);
        aCommand1 =new Command("Alert Forever",Command.SCREEN,2);
        aCommand2 =new Command("Alert timeout",Command.SCREEN,2);
        form = new Form("gauge form 3");
        form.append("GaugeAlert Demo");
        form.addCommand(exitCommand);
        form.addCommand(aCommand1);
        form.addCommand(aCommand2);
        //设置命令监听对象
        form.setCommandListener(this);
    }
    
    protected void startApp(  ) throws MIDletStateChangeException
    {
        Display.getDisplay(this).setCurrent(form);
    }

    protected void pauseApp(  )
    {
    }

    protected void destroyApp( boolean p1 )
    {
    }

    public void commandAction(Command c,Displayable d)
    {
        if (c ==exitCommand)
        {
            destroyApp(false);
            notifyDestroyed();
        }
        else if (c ==aCommand1)
        {//显示不会自动消失的警告窗口
            alert = new GaugeAlert("GaugeAlert", "Alert without timeout", null,null,Alert.FOREVER);
            Display.getDisplay(this).setCurrent(alert, form);
        }
        else if (c ==aCommand2)
        {//显示10秒钟自动消失的警告窗口
            alert = new GaugeAlert("GaugeAlert","Alert timeout=10s", null,null, 10000);
            Display.getDisplay(this).setCurrent(alert, form);
        }
        else if(c ==Alert.DISMISS_COMMAND)
        {//处理警告窗口退出的命令
            //必须手工设置当前需要显示的对象
            Display.getDisplay(this).setCurrent(form);
            alert = null;
        }
    }
}