itemstatelistenerdemo.java

来自「J2ME手机游戏开发技术详解随书光盘」· Java 代码 · 共 44 行

import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
public class ItemStateListenerDemo extends MIDlet implements CommandListener {
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private Form mainForm;
    private TextField mTextField;
    private StringItem mStringItem;
    public ItemStateListenerDemo() {
        mainForm = new Form("TextField演示");
        mTextField = new TextField("文本", "", 50, TextField.ANY);
        mStringItem = new StringItem("输入的内容为:","");
        mainForm.append(mTextField);
        mainForm.append(mStringItem);
        ItemStateListener listener = new ItemStateListener(){
        public void itemStateChanged(Item item){
        if(item == mTextField){
        int len = mTextField.size();
        char[] charArray = new char[len];
        mTextField.getChars(charArray);
        mStringItem.setText(new String(charArray));
        
        }
        }
        };
        mainForm.setItemStateListener(listener);    
        mainForm.addCommand(exitCommand);
        mainForm.setCommandListener(this);
    }
    protected void startApp() {

            Display.getDisplay(this).setCurrent(mainForm);
    }
    public void commandAction(Command c, Displayable s) {
	if (c == exitCommand) {
	    destroyApp(false);
	    notifyDestroyed();
	}	
    }
    protected void destroyApp(boolean unconditional) {
    }
    protected void pauseApp() {
    }
}