expenses.java

mobile java code

/*
 Expenses
 A sample J2ME MIDP application that illustrates the use
 of List and Command UI components
 Copyright 2002 CNet Networks
 */
package ExpensesApp;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Vector;

public class Expenses extends MIDlet implements CommandListener {
    private Display display;
    private Vector expenseItems;
    private List lsMain;
    private Command cmAdd, cmEdit, cmExit, cmMenu;
    private int itemCount = 0;

    public Expenses() {
        display = Display.getDisplay(this);
        //get some play data
        expenseItems = ExpenseInfo.LoadExpenses();
        itemCount = expenseItems.size();
        //Setup the UI
        lsMain = new List("Expenses", List.IMPLICIT) ;
        cmAdd = new Command("New", Command.SCREEN, 3);
        cmEdit = new Command("Edit", Command.ITEM, 2);
        cmExit = new Command("Exit", Command.EXIT, 1);

        lsMain.addCommand(cmAdd);
        lsMain.addCommand(cmEdit);
        lsMain.addCommand(cmExit);

        lsMain.setCommandListener(this);
        //add all the Expense items to lsMain
        rebuildList();
    }

    public void startApp() throws MIDletStateChangeException {
        //Show the main UI form
        display.setCurrent(lsMain);
    }

    public void commandAction(Command cm, Displayable d) {
        if (cm == List.SELECT_COMMAND || cm == cmEdit) {
            //User selected an item in lsMain or
            //invoked the "Edit" command from the menu
            //Edit an item, we'll implement this later
        } else if (cm == cmAdd) {
            //User invoked the "Add" command from the menu
            //Add a new item, we'll implement this later
        } else if (cm == cmExit) {
            //User invoked the "Exit" command
            destroyApp(false);
            notifyDestroyed();
        }
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean b) {
    }

    private void rebuildList(){
        //add all the expense items to lsMain
        for(int i=0; i<expenseItems.size(); i++){
            if (expenseItems.elementAt(i) != null){
                ExpenseInfo exp = (ExpenseInfo) expenseItems.elementAt(i);
                lsMain.append(exp.getDescription(),null);
            }
        }
    }
}