textfielddemo.java

j2me手机应用开发环境下的UI程序

/*
 *
 * Copyright © 2007 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */
package textfield;

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


/**
 * The text field demo displays all of the text field types on the screen
 * allowing the user to edit them at will.
 *
 * @version 2.0
 */
public class TextFieldDemo extends MIDlet implements CommandListener {
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private boolean firstTime;
    private Form mainForm;

    public TextFieldDemo() {
        firstTime = true;
        mainForm = new Form("Text Field");
    }

    protected void startApp() {
        if (firstTime) {
            mainForm.append("This demo contains text fields each one " +
                "with a different constraint");

            mainForm.append(new TextField("Any Character", "", 15, TextField.ANY));
            mainForm.append(new TextField("E-Mail", "", 15, TextField.EMAILADDR));
            mainForm.append(new TextField("Number", "", 15, TextField.NUMERIC));
            mainForm.append(new TextField("Decimal", "", 15, TextField.DECIMAL));
            mainForm.append(new TextField("Phone", "", 15, TextField.PHONENUMBER));
            mainForm.append(new TextField("Password", "", 15, TextField.PASSWORD));
            mainForm.append(new TextField("URL", "", 15, TextField.URL));

            mainForm.addCommand(exitCommand);
            mainForm.setCommandListener(this);
            firstTime = false;
        }

        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() {
    }
}