util.java

J2ME编的手机助手 文件下载解压缩以后,是一个NetBeans的工程文件,如果有NB的朋友,可以直接打开编辑 源文件在src目录下面,可执行文件在dist目录下 功能如下 1

/*
 * Util.java
 *
 * Created on 2007年3月11日, 下午3:50
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package net.bccn.account.util;

import java.util.TimeZone;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Item;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;
import net.bccn.account.Main;
import net.bccn.account.ui.About;
import net.bccn.account.ui.AddAccount;
import net.bccn.account.ui.AddNote;
import net.bccn.account.ui.Help;
import net.bccn.account.ui.INFO;
import net.bccn.account.ui.MainForm;
import net.bccn.account.ui.SetForm;
import net.bccn.account.ui.ViewAccount;
import net.bccn.account.ui.ViewAccountForm;
import net.bccn.account.ui.ViewNote;
import net.bccn.account.ui.ViewNoteForm;

/**
 *
 * @author hadeslee
 */
public class Util {
    private static Display dis;
    public static final int ADD_ACCOUNT=1;
    public static final int MAIN_FORM=2;
    public static final int VIEW_ACCOUNT_FORM=4;
    public static final int SET_FORM=5;
    public static final int HELP=6;
    public static final int ABOUT=7;
    public static final int VIEW_ACCOUNT=8;
    public static final int ADD_NOTE=9;
    public static final int VIEW_NOTE=10;
    public static final int VIEW_NOTE_FORM=11;
    public static int current=MAIN_FORM;//代表当前窗口
    private static String RECORD_NAME="hadeslee";//表示记录仓库的名字
    private static RecordStore rs;//一个一直开着的记录仓库
    public static Main main;//主MIDlet
    public static final int OFF_SET;
    static{
        TimeZone tz=TimeZone.getDefault();
        OFF_SET=tz.getRawOffset();
    }
    /** Creates a new instance of Util */
    private Util() {
    }
    public static void openRecordStore(){
        if(rs!=null){
            Util.showINFO(AlertType.WARNING,"已经打开过记录仓库!!");
            return;
        }
        try{
            rs=RecordStore.openRecordStore(RECORD_NAME,true);
        } catch(Exception exe){
            Util.showINFO(AlertType.ERROR,"初始化程序出错,请重新安装程序或与作者联系!!\n以" +
                    "下是错误信息:\n"+exe.getMessage());
        }
    }
    //保存记录
    public static boolean saveRecord(Record rec){
        try{
            byte[] data=rec.toBytes();
            int i=rs.addRecord(data,0,data.length);
            rec.setID(i);
        } catch(Exception exe){
            Util.showINFO(AlertType.ERROR,"数据保存时出现异常!以下是错误信息:\n"+exe.getMessage());
            return false;
        }
        return true;
    }
    //更新记录
    public static boolean updateRecord(Record rec){
        try {
            byte[] data=rec.toBytes();
            rs.setRecord(rec.getID(),data,0,data.length);
        } catch (Exception e) {
            return false;
        }
        return true;
    }
    //删除记录
    public static boolean deleteRecord(Record rec){
        try {
            rs.deleteRecord(rec.getID());
        } catch (Exception e) {
            return false;
        }
        return true;
    }
    //根据提供的样本得到符合要求的记录
    public static Record[] getAllRecords(Record sample){
        try{
            RecordEnumeration re=rs.enumerateRecords(sample,sample,false);
            Record[] recs=new Record[re.numRecords()];
            int index=0;
            while(re.hasNextElement()){
                Record ac=sample.getEmptyRecord();
                ac.setID(re.nextRecordId());
                ac.fromBytes(rs.getRecord(ac.getID()));
                recs[index]=ac;
                index++;
            }
            re.destroy();//调用destroy,释放其资源
            return recs;
        } catch(Exception exe){
            exe.printStackTrace();
            return null;
        }
    }
    public static void setDisplay(Display diss){
        dis=diss;
    }
    public static void showINFO(AlertType at,String s){
        dis.setCurrent(INFO.getInstance(at,s));
    }
    public static void showINFO(AlertType at,String s,Displayable next){
        dis.setCurrent(INFO.getInstance(at,s),next);
    }
    
    public static void moveTo(Displayable diss){
        dis.setCurrent(diss);
    }
    public static void moveTo(Item item){
        dis.setCurrentItem(item);
    }
    public static void changeTo(int who){
        current=who;
        switch(who){
            case ADD_ACCOUNT:
                dis.setCurrent(AddAccount.getInstance());
                break;
            case MAIN_FORM:
                dis.setCurrent(MainForm.getInstance());
                break;
            case VIEW_ACCOUNT_FORM:
                dis.setCurrent(ViewAccountForm.getInstance());
                break;
            case SET_FORM:
                dis.setCurrent(SetForm.getInstance());
                break;
            case VIEW_ACCOUNT:
                if(ViewAccount.getInstance()!=null)
                    dis.setCurrent(ViewAccount.getInstance());
                break;
            case HELP:
                dis.setCurrent(Help.getInstance());
                break;
            case ABOUT:
                dis.setCurrent(About.getIntstance());
                break;
            case ADD_NOTE:
                dis.setCurrent(AddNote.getInstance());
                break;
            case VIEW_NOTE_FORM:
                dis.setCurrent(ViewNoteForm.getInstance());
                break;
            case VIEW_NOTE:
                dis.setCurrent(ViewNote.getInstance());
                break;
        }
    }
}