customitemdemo.java

Java ME手机应用开发大全一书的配套光盘上的源码

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

public class CustomItemDemo extends MIDlet
    implements CommandListener 
{
  private TextField text;
  private SimpleItem customitem;
  private Command exit;
  public void startApp() {
	text= new TextField("姓名", "", 30, TextField.ANY);
    Form form = new Form("SimpleItemMIDlet");
	customitem=new SimpleItem("自定义控件");
    form.append(customitem);
	form.append(text);
    exit = new Command("退出", Command.EXIT, 0);
    form.addCommand(exit);
    form.setCommandListener(this);

    Display.getDisplay(this).setCurrent(form);
  }

  public void pauseApp() {}

  public void destroyApp(boolean unconditional) {}
  
  public void commandAction(Command c, Displayable s) {
    if (c==exit)
	  {
        destroyApp(false);
        notifyDestroyed();
	  }
  }


 class SimpleItem extends CustomItem {
  public SimpleItem(String title) { super(title); } 
  // 实现CustomItem的抽象方法  
  public int getMinContentWidth() { return 100; }
  public int getMinContentHeight() { return 60; }
  
  public int getPrefContentWidth(int width) {
    return getMinContentWidth();
  }
  
  public int getPrefContentHeight(int height) {
    return getMinContentHeight();
  }
  
  public void paint(Graphics g, int w, int h) {
    g.drawRect(0, 0, w - 1, h - 1);
    g.setColor(0x000000ff);
	g.drawString(text.getString(),0,0,0);
    
 
  }
  public void commandAction(Command c, Item i)
	{ 
		    repaint();
	}

  } 
}