progressobserverui.java

一个简单的移动银行实例程序

package com.chapter16.bankbillClent;

import javax.microedition.lcdui.*;



public class ProgressObserverUI extends Form implements ProgressObserver, 
        CommandListener {  
    private static final int GAUGE_MAX = 8;
    private static final int GAUGE_LEVELS = 4;
    int current = 0;
    Gauge gauge;
    Command stopCommand;
    boolean stoppable;
    boolean stopped;

    public ProgressObserverUI() {
        super("");

        gauge = new Gauge("", false, GAUGE_MAX, 0);
        stopCommand = new Command("ֹͣ", 
                                  Command.STOP, 10);

        append(gauge);
        setCommandListener(this);
    }

    public void init(String note, boolean stoppable) {
        gauge.setValue(0);
        setNote(note);
        setStoppable(stoppable);

        stopped = false;
    } 

    public void setNote(String note) {
        setTitle(note);
    } 

    public boolean isStoppable() {
        return stoppable;
    } 

    public void setStoppable(boolean stoppable) {
        this.stoppable = stoppable;

        if (stoppable) {
            addCommand(stopCommand);
        } else {
            removeCommand(stopCommand);
        } 
    } 

 
    public boolean isStopped() {
        return stopped;
    } 

    public void updateProgress() {
        current = (current + 1) % GAUGE_LEVELS;

        gauge.setValue(current * GAUGE_MAX / GAUGE_LEVELS);
    } 

    public void commandAction(Command c, Displayable d) {
        if (c == stopCommand) {
            stopped = true;
        } 
    } 

}