options.java

这是一个手机上的J2ME程序

// J2ME Compass
// Copyright (C) 2007 Dana Peters
// http://www.qcontinuum.org/compass

package org.qcontinuum.compass;

import javax.microedition.lcdui.*;

public class Options extends Form implements CommandListener {

    private Displayable mParent;
    private Preferences mPreferences;
    private Command mOkCommand, mCancelCommand;
    private ChoiceGroup mFacesChoiceGroup, mTopChoiceGroup, mTimeChoiceGroup;
    private ChoiceGroup mDayColourChoiceGroup, mNightColourChoiceGroup;

    private final int colors[] = { 0x00ffff, 0x0080ff, 0x00ff00, 0x808080, 0xffffff };
    private final String names[] = { "Teal", "Blue", "Green", "Gray", "White" };

    public Options(Displayable parent) {
        super("Orientation Options");
        mParent = parent;
        mPreferences = Compass.getPreferences();
        append(mFacesChoiceGroup = new ChoiceGroup("Screen Faces", List.EXCLUSIVE));
        mFacesChoiceGroup.append("Sky", null);
        mFacesChoiceGroup.append("Ground", null);
        mFacesChoiceGroup.setSelectedIndex(mPreferences.ScreenDown ? 1 : 0, true);
        append(mTopChoiceGroup = new ChoiceGroup("Screen Top Points", List.EXCLUSIVE));
        mTopChoiceGroup.append("North", null);
        mTopChoiceGroup.append("Sun or Moon", null);
        mTopChoiceGroup.append("Destination", null);
        mTopChoiceGroup.setSelectedIndex(mPreferences.ScreenTop, true);
        append(mTimeChoiceGroup = new ChoiceGroup("Time Format", List.EXCLUSIVE));
        mTimeChoiceGroup.append("12 Hour", null);
        mTimeChoiceGroup.append("24 Hour", null);
        mTimeChoiceGroup.setSelectedIndex(mPreferences.Hour24 ? 1 : 0, true);
        append(mDayColourChoiceGroup = new ChoiceGroup("Day Color", List.EXCLUSIVE));
        initColourChoices(mDayColourChoiceGroup, mPreferences.DayColour);
        append(mNightColourChoiceGroup = new ChoiceGroup("Night Color", List.EXCLUSIVE));
        initColourChoices(mNightColourChoiceGroup, mPreferences.NightColour);
        addCommand(mCancelCommand = new Command("Cancel", Command.CANCEL, 1));
        addCommand(mOkCommand = new Command("OK", Command.OK, 1));
        setCommandListener(this) ;
    }

    private void initColourChoices(ChoiceGroup colourChoiceGroup, int selectedColour) {
        int selectedIndex = -1;
        for (int i = 0; i < colors.length; i++) {
            Image mutableImage = Image.createImage(11,11);
            Graphics myGraphics = mutableImage.getGraphics();
            myGraphics.fillRect(0, 0, 10, 10);
            myGraphics.setColor(colors[i]);
            myGraphics.fillRect(1, 1, 8, 8);
            Image immutableImage = Image.createImage(mutableImage);
            colourChoiceGroup.append(names[i], immutableImage);
            if (colors[i] == selectedColour)
                selectedIndex = i;
        }
        if (selectedIndex >= 0)
            colourChoiceGroup.setSelectedIndex(selectedIndex, true);
    }

    public void commandAction(Command c, Displayable d)  {
        if (c == mOkCommand) {
            mPreferences.ScreenDown = mFacesChoiceGroup.getSelectedIndex() == 1;
            mPreferences.ScreenTop = (short)mTopChoiceGroup.getSelectedIndex();
            mPreferences.Hour24 = mTimeChoiceGroup.getSelectedIndex() == 1;
            mPreferences.DayColour = colors[mDayColourChoiceGroup.getSelectedIndex()];
            mPreferences.NightColour = colors[mNightColourChoiceGroup.getSelectedIndex()];
            mPreferences.save();
            Compass.display(mParent);
        } else if (c == mCancelCommand) {
            Compass.display(mParent);
        }
    }
}