preferences.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 java.io.*;
import javax.microedition.rms.*;

public class Preferences {

    public short ScreenTop;
    public boolean ScreenDown;
    public boolean Hour24;
    public int DayColour, NightColour;

    private Location mLocation;
    private Location mDestination;

    public Preferences() {
        load();
    }

    public Location getLocation() {
        return mLocation;
    }
    
    public void setLocation(Location location) {
        mLocation = location;
    }
 
    public Location getDestination() {
        return mDestination;
    }
    
    public void setDestination(Location location) {
        mDestination = location;
    }
    
    public void save() {
        RecordStore recordStore;
        DataOutputStream outputStream;
        try {
            recordStore = RecordStore.openRecordStore("preferences", true);
        } catch (RecordStoreException rsc) {
            return;
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        outputStream = new DataOutputStream(baos);
        try {
            outputStream.writeBoolean(ScreenDown);
            outputStream.writeShort(ScreenTop);
            outputStream.writeBoolean(Hour24);
            outputStream.writeInt(DayColour);
            outputStream.writeInt(NightColour);
            outputStream.writeBoolean(mLocation != null);
            if (mLocation != null)
                mLocation.save(outputStream);
            outputStream.writeBoolean(mDestination != null);
            if (mDestination != null)
                mDestination.save(outputStream);
            byte[] bytes = baos.toByteArray();
            if (recordStore.getNumRecords() == 0)
                recordStore.addRecord(bytes, 0, bytes.length);
            else
                recordStore.setRecord(1, bytes, 0, bytes.length);
        } catch (Exception exception) {
        } finally {
            try {outputStream.close();} catch (Exception ex) {}
            try {recordStore.closeRecordStore();} catch (Exception ex) {}
        }
    }
    
    private void load() {
        RecordStore recordStore = null;
        DataInputStream inputStream = null;
        try {
	    recordStore = RecordStore.openRecordStore("preferences", false);
            byte[] bytes = recordStore.getRecord(1);
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
            inputStream = new DataInputStream(bais);
            ScreenDown = inputStream.readBoolean();
            ScreenTop = inputStream.readShort();
            Hour24 = inputStream.readBoolean();
            DayColour = inputStream.readInt();
            NightColour = inputStream.readInt();
            if (inputStream.readBoolean())
                mLocation = new Location(inputStream);
            else
                mLocation = null;
            if (inputStream.readBoolean())
                mDestination = new Location(inputStream);
            else
                mDestination = null;
        } catch (Exception ex) {
            ScreenDown = false;
            ScreenTop = 0;
            Hour24 = false;
            DayColour = 0x0080ff;
            NightColour = 0x808080;
            mLocation = null;
            mDestination = null;
        } finally {
            try {inputStream.close();} catch (Exception ex) {}
            try {recordStore.closeRecordStore();} catch (Exception ex) {}
        }
    }
}