groupcardmanager.java

J2ME程序设计实例教程的源码

import javax.microedition.lcdui.*;
import javax.microedition.pim.*;
import java.util.*;

/**
 * 组内的名片列表。
 */
public class GroupCardManager extends MicroComponent implements CommandListener {
    //
    private Cardcase cardcase;
    private String category;
    private CardcaseMIDlet midlet;
    private MicroComponent backScreen;
    
    private Vector cardsList;   //组内名片
    private List cardListView;  //名片列表视图
    
    private Command cmdBack = new Command("返回", Command.BACK, 1);
    private Command cmdDelete = new Command("删除", Command.SCREEN, 3);
    private Command cmdSelect = new Command("详细", Command.SCREEN, 2);
    
    public GroupCardManager(Cardcase cardcase, String category, CardcaseMIDlet midlet, MicroComponent backScreen) {
        this.cardcase = cardcase;
        this.category = category;
        this.midlet = midlet;
        this.backScreen = backScreen;
        
        cardListView = new List("\"" + category + "\"名片列表", Choice.IMPLICIT);
        cardListView.addCommand(cmdBack);
        cardListView.setCommandListener(this);
    }
    
    public void show() {
        updatView();
        Display.getDisplay(midlet).setCurrent(cardListView);
    }
    
    private void updatView() {
        cardsList = null;
        try {
            cardsList = cardcase.getCards(category);
        }
        catch(PIMException pime) {
            midlet.showError("查看名片组\""+category + "\"错误！原因\n" + pime);
        }
        
        cardListView.deleteAll();
        int n = cardsList.size();
        for(int i=0; i<n; i++) {
            Contact card = (Contact)cardsList.elementAt(i);
            String cardLabel = cardcase.getCardLabel(card);
            System.out.println("cardLabel ========" + cardLabel);
            cardListView.append(cardLabel, null);
        }
        
        if(cardListView.size() > 0) {
            cardListView.addCommand(cmdDelete);
            cardListView.addCommand(cmdSelect);
        }
        else {
            cardListView.removeCommand(cmdDelete);
            cardListView.removeCommand(cmdSelect);
        }
    }
    
    public void commandAction(Command cmd, Displayable d) {
        if(cmd == cmdBack) {
            backScreen.show();
        }
        else if(cmd == cmdSelect || cmd == List.SELECT_COMMAND) {
            int index = cardListView.getSelectedIndex();
            Contact card = (Contact)cardsList.elementAt(index);
            CardShowForm csForm = new CardShowForm(cardcase, card, midlet, this);
            csForm.show();
        }
        else if(cmd == cmdDelete) {
            try {
                int index = cardListView.getSelectedIndex();
                Contact card = (Contact)cardsList.elementAt(index);
                cardcase.deleteCardFromCategory(card, category);
                updatView();
            }
            catch(PIMException pime) {
                midlet.showError("删除名片组错误！" + pime);
            }
        }
    }
}