gaugedemo.java

来自「j2me学习 简单例子」· Java 代码 · 共 94 行

package example.demoseniorui.gauge;

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

/**
 * <p>J2ME Gauge Demo</p>
 * 
 * @author 刘光辉
 * @version 2009.02.01
 */
public class GaugeDemo extends MIDlet implements CommandListener{

	private static final Command CMD_EXIT = new Command("EXIT",Command.EXIT,1);
	private Display display;
	private Form mainForm;
	private NonInteractiveGaugeRunnable nonInteractive;
    private IncrementalIndefiniteGaugeRunnable indefinite;
	
	/**
	 * <p>GaugeDemo的构造函数</p>
	 */
	public GaugeDemo() {
		display = Display.getDisplay(this);
		mainForm = new Form("GaugeDemo");
		
		mainForm.append(new Gauge("Interactive",true,10,0));
		
		nonInteractive = new NonInteractiveGaugeRunnable("Non Interactive", 10, 0);
		new Thread(nonInteractive).start();
		mainForm.append(nonInteractive);
		
		mainForm.append(new Gauge("Indefinite - Running", false, Gauge.INDEFINITE,
                Gauge.CONTINUOUS_RUNNING));
		
        indefinite = new IncrementalIndefiniteGaugeRunnable("Indefinite - Incremental");
        new Thread(indefinite).start();
        mainForm.append(indefinite);
        
        mainForm.addCommand(CMD_EXIT);
        mainForm.setCommandListener(this);
	}

	/**
	 * <p>启动程序,使MIDlet处于active状态</p>
	 * <p></p>
	 * @see javax.microedition.midlet.MIDlet#startApp()
	 */
	protected void startApp() throws MIDletStateChangeException {
        display.setCurrent(mainForm);
	}

	/**
	 * <p>暂停程序,使MIDlet处于pause状态</p>
	 * @see javax.microedition.midlet.MIDlet#pauseApp()
	 */
	protected void pauseApp() {

	}

	/**
	 * <p>销毁程序,使MIDlet处于destroyed状态</p>
	 * 
	 * @param boolean unconditional 
	 * <ul>true 释放资源保存数据进入destroyed状态,false 抛出异常保持当前状态</ul>
	 * @see javax.microedition.midlet.MIDlet#destroyApp(boolean)
	 */
	protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
        nonInteractive.setDone();
        indefinite.setDone();
	}

	/**
	 * <p>命令处理函数,实现CommandListener接口</p>
	 * @param Command c 命令对象
	 * @param Displayable d 被放置到显示屏显示的对象
	 */
	public void commandAction(Command c, Displayable d) {
        try {
			destroyApp(false);
		} catch (MIDletStateChangeException e) {
			e.printStackTrace();
		}
        notifyDestroyed();
	}

}