J2ME学习（2）-------界面及打包
J2ME提供的工具CREATE PACKAGE进行打包。在deployed目录下生成一个jad和一个jar文件，一般的手机需要jar文件即可。有时需要两个。
获得当前MIDLET的显示：
display = Display.getDisplay(this);
显示可视化对象：
display.setCurrent(form);
添加命令
private Command del = new Command("删除", Command.SCREEN, 1);
private Command back = new Command("返回", Command.BACK, 1);
form.addCommand(back);
form.addCommand(del);
form.addCommand(edt);
事件：
private class CmdListener implements CommandListener
{
public void commandAction(Command c, Displayable d)
{
}
}
或： extends MIDlet implements CommandListener
form.setCommandListener(new CmdListener());
form.setCommandListener(this);
if(c == del)
System.out.println("删除");
else if(c == edt)
System.out.println("编辑");
else if(c == back)
notifyDestroyed();
c.getLabel.equal()
List list = new List("sdfsdfsdf", List.MULTIPLE);
display.setCurrent(list);
list.append("a", null);
list.append("b", null);
Image image = Image.createImage("/shoujitu.gif");
list.append("b", image);
if(c == List.SELECT_COMMAND)//特指IMPLICIT类型的List command
list.setTicker(new Ticker("sdklfsdfkljsdklfjsldf"));
alert
Date date = new Date();
DateField dateField = new DateField("sdklfjsdklf", DateField.DATE);
dateField.setDate(date);
form.append(dateField);
ChoiceGroup group = new ChoiceGroup("性别", ChoiceGroup.POPUP);
group.append("男", null);
form.append(group);
Gauge gauge = new Gauge("进度条", true, 320, 0);
form.append(gauge);
ImageItem imageItem = new ImageItem("sdklfjsdklf", Image.createImage("/shoujitu.gif"), ImageItem.LAYOUT_CENTER,
"lksdjklsdf");
form.append(imageItem);
TextField field = new TextField("TextField", "5", 8, TextField.NUMERIC);
form.append(field);
StringItem item = new StringItem("abc", "dddd", StringItem.BUTTON);
item.addCommand(new Command("sdkfljsdlf", Command.BACK, 0));
form.append(item);
ItemCommandListener
private Command command = new Command("删除", Command.ITEM, 2);
field.addCommand(command);
field1.addCommand(command);
field.setItemCommandListener(this);
field1.setItemCommandListener(this);
public void commandAction(Command c, Item i)
{
TextField field12 = (TextField)i;
int pos = field12.getCaretPosition();
field12.delete(pos - 1, 1);
}
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