elementnumberscreen.java

手机游戏设计一书的源代码

package  webservice.midlet;


import  javax.microedition.lcdui.*;
import  javax.microedition.io.*;
import  java.io.*;


public class ElementNumberScreen extends Form
        implements CommandListener {
    StringItem stringItem1 = new StringItem("", "");
    TextField elementField = new TextField("", "", 11, TextField.NUMERIC);

    /** 构造器 */
    public ElementNumberScreen () {
        super("Displayable Title");
        try {
            jbInit();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

/**组件初始化*/

    private void jbInit () throws Exception {
        elementField.setLabel("请输入元素周期表中的元素号:");
        //设置事件听众
        setCommandListener(this);
        //添加命令对象
        addCommand(new Command("Submit", Command.SCREEN, 1));
        addCommand(new Command("Exit", Command.EXIT, 2));
        this.append(stringItem1);
        this.append(elementField);
        Display.getDisplay(ChemistryMIDlet.chemistryMIDlet).setCurrent(this);
    }

    /**处理命令事件 */
    public void commandAction (Command command, Displayable displayable) {

        if (command.getCommandType() == Command.EXIT) {
            // 退出MIDlet
            ChemistryMIDlet.quitApp();
        }
        else if (command.getCommandType() == Command.SCREEN) {
            String elementNumber = elementField.getString();
            Display.getDisplay(ChemistryMIDlet.chemistryMIDlet).setCurrent(
                    new ElementInfoScreen(elementNumber));
        }
    }
}