customitem_midlet.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class CustomItem_MIDlet
    extends MIDlet
    implements CommandListener, ItemCommandListener {
  private Command exitCommand, editCommand, okCommand;
  private Form form;
  TableItem table1;
  TextField tfEdit;
  public CustomItem_MIDlet() {
    exitCommand = new Command("退出", Command.EXIT, 1);
    form = new Form("CustomeItemDemo");
    form.addCommand(exitCommand);
    form.setCommandListener(this);

    table1 = new TableItem("4*3 table", 4, 3, 40, 20);
    form.append("----Head----");
    form.get(0).setLayout(Item.LAYOUT_NEWLINE_AFTER | Item.LAYOUT_2);
    form.append(table1);
    form.append("----Tail----");
    form.get(2).setLayout(Item.LAYOUT_NEWLINE_BEFORE | Item.LAYOUT_2);
    //设置单元格文字
    table1.setText("J2EE", 0, 0);
    table1.setText("J2SE", 0, 1);
    table1.setText("J2ME", 0, 2);

    //为TableItem 对象添加命令，并设置默认命令
    editCommand = new Command("Edit", Command.SCREEN, 1);
    table1.addCommand(editCommand);
    table1.setItemCommandListener(this);
    table1.setDefaultCommand(editCommand);
    //为TextField 对象添加命令，并设置默认命令
    okCommand = new Command("OK", Command.SCREEN, 1);
    tfEdit = new TextField("TextEdit", "", 10, TextField.ANY);
    form.append(tfEdit);
    tfEdit.addCommand(okCommand);
    tfEdit.setItemCommandListener(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();
    }
  }

  public void commandAction(Command c, Item i) {
    if (c == editCommand) {
      System.out.println("editCommand from TableItem");
      tfEdit.setString(table1.getText(table1.getCurrentX(), table1.getCurrentY()));
      Display.getDisplay(this).setCurrentItem(tfEdit);
    }
    if (c == okCommand) {
      System.out.println("okCommand from TextField");
      table1.setText(tfEdit.getString(), table1.getCurrentX(),
                     table1.getCurrentY());
      Display.getDisplay(this).setCurrentItem(table1);
    }
  }

}