choosepiecescreen.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 98 行

// Copyright 2002 Nokia Corporation.
//
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package example.tictactoe;

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


public class ChoosePieceScreen
    extends List
    implements CommandListener
{
    private static final String CIRCLE_TEXT = "Circle";
    private static final String CROSS_TEXT = "Cross";

    private final TicTacToeMIDlet midlet;
    private final Command quitCommand;

    public ChoosePieceScreen(TicTacToeMIDlet midlet)
    {
        super("Choose your piece", List.IMPLICIT);

        this.midlet = midlet;

        append(CIRCLE_TEXT, loadImage("/circle.png"));
        append(CROSS_TEXT,  loadImage("/cross.png"));

        quitCommand = new Command("Quit", Command.EXIT, 2);
        addCommand(quitCommand);
        setCommandListener(this);
    }


    public void commandAction(Command c, Displayable d)
    {
        boolean isPlayerCircle =
            getString(getSelectedIndex()).equals(CIRCLE_TEXT);

        if (c == List.SELECT_COMMAND)
        {
            midlet.choosePieceScreenDone(isPlayerCircle);
        }
        else // quitCommand
        {
            midlet.quit();
        }
    }


    private Image loadImage(String imageFile)
    {
        Image image = null;
        try
        {
            image = Image.createImage(imageFile);
        }
        catch (Exception e)
        {
            // Use a 'null' image in the choice list (i.e. text only choices).
        }
        return image;
    }
}