stringitemmidlet.java

j2me的程序

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
// A first MIDlet with simple text and a few commands.
public class StringItemMIDlet extends MIDlet implements CommandListener{

  private Command exitCommand;
  private Command setLabelCommand;
  private Command setTextCommand;
  private Command getLabelTextCommand;

  private StringItem stringItem1;
  private StringItem stringItem2;

  private Display display;

  public StringItemMIDlet() {
    display = Display.getDisplay(this);

    exitCommand = new Command("离开", Command.EXIT, 1);
    setLabelCommand = new Command("设置标签",Command.SCREEN,1);
    setTextCommand = new Command("设置内容",Command.SCREEN,1);
    getLabelTextCommand = new Command("取得",Command.SCREEN,1);

    stringItem1 = new StringItem("标签1","内容1");
    stringItem2 = new StringItem(null,"内容2");
  }

  public void startApp() {
    Form aForm = new Form("StringItem示范");

    aForm.append(stringItem1);
    aForm.append(stringItem2);
    aForm.addCommand(exitCommand);
    aForm.addCommand(setLabelCommand);
    aForm.addCommand(setTextCommand);
    aForm.addCommand(getLabelTextCommand);
    aForm.setCommandListener(this);
    display.setCurrent(aForm);
  }

  public void pauseApp() { }

  public void destroyApp(boolean unconditional) { }

  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(false);
      notifyDestroyed();
    }
    if(c==setLabelCommand)
      stringItem1.setLabel("new label");
    if(c==setTextCommand)
      stringItem2.setText("new text");
    if(c==getLabelTextCommand){
	  Alert alert = new Alert("信息",stringItem1.getLabel() + ":" +
	                stringItem1.getText(),null,AlertType.INFO);
	  alert.setTimeout(5000);
	  display.setCurrent(alert);

    }
  }

}