stringitemdemo.java

人民邮电出版社的《J2ME手机开发入门》全部源代码

/*
 * StringItemDemo.java
 *
 * Created on 2005年4月18日, 下午2:20
 */

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

/**
 *
 * @author  Liu Bin
 * @version
 */
public class StringItemDemo extends MIDlet implements ItemCommandListener {
    private Display display;
    private Form form;
    
    private Command cmdSelect;
    //退出命令按钮
    private Command cmdExit;
    
    //用于输入结果
    private TextField tf;
    //显示用户输入结果
    private StringItem siPlain;
    
    public StringItemDemo() {
        try {
            nbInit();
        } catch(Exception e) {
            e.printStackTrace();
        }
        
    }
    
    private void nbInit() throws Exception {
        form = new Form("StringItem演示");
        
        StringItem siFont = new StringItem("字体演示：",
                "不同字体的效果", Item.PLAIN);
        Font font = Font.getFont(Font.FACE_PROPORTIONAL,
                Font.STYLE_BOLD + Font.STYLE_ITALIC,
                Font.SIZE_LARGE);
        siFont.setFont(font);
        siFont.setLayout(Item.LAYOUT_EXPAND);
        form.append(siFont);
        
        StringItem siHyperlink = new StringItem("单击查看：",
                "http://www.yahoo.com.cn", Item.HYPERLINK);
        siHyperlink.setLayout(Item.LAYOUT_EXPAND);
        form.append(siHyperlink);
        
        tf = new TextField("输入任何内容", "", 50, TextField.ANY);
        form.append(tf);
        
        StringItem siButton = new StringItem(null, "提交", Item.BUTTON);
        cmdSelect = new Command("选择", Command.ITEM, 1);
        siButton.setDefaultCommand(cmdSelect);
        siButton.setItemCommandListener(this);
        siButton.setLayout(Item.LAYOUT_CENTER + Item.LAYOUT_NEWLINE_AFTER);
        form.append(siButton);
        
        siPlain = new StringItem("输入结果：", "", Item.PLAIN);
        siPlain.setLayout(Item.LAYOUT_EXPAND);
        form.append(siPlain);
    }
    
    public void startApp() {
        display = Display.getDisplay(this);
        display.setCurrent(form);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
        notifyDestroyed();
    }
    
    /**
     * 处理命令按钮事件
     */
    public void commandAction(Command cmd, Item i) {
        if (cmd == cmdSelect) {
            siPlain.setText(tf.getString());
        }
        
        if (cmd == cmdExit) {
            destroyApp(false);
        }
    }
}