package com.j2medev.chapter3;

import javax.microedition.io.ConnectionNotFoundException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class NativeMIDlet extends MIDlet implements CommandListener {
    
    private Display display = null;
    private List main = new List("menu",List.IMPLICIT);
    private Command exitCommand = new Command("Exit",Command.EXIT,1);
    public static final String WAP_BROWSER = "wap browser";
    public static final String TELEPHONE = "call telephone";
    
    public void startApp() {
        //初始化main菜單
        if(display == null){
            display = Display.getDisplay(this);
            main.append(WAP_BROWSER,null);
            main.append(TELEPHONE,null);
            main.addCommand(exitCommand);
            main.setCommandListener(this);
        }
        display.setCurrent(main);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == List.SELECT_COMMAND){
            String label = main.getString(main.getSelectedIndex());
            String URL = "";
            if(label.equals(WAP_BROWSER)){
                URL = "http://www.j2medev.com";
            }else if(label.equals(TELEPHONE)){
                URL = "tel:13810018823";
            }
            try{
                //如果請求必須在MIDlet退出后才能響應，則退出
                boolean flag = platformRequest(URL);
                if(flag){
                    exit();
                }
            }catch(ConnectionNotFoundException ex){
                ex.printStackTrace();
                //將錯誤信息顯示到手機屏幕對調試很有幫助
                Alert a = new Alert("error",ex.getMessage(),null,AlertType.ERROR);
                a.setTimeout(2000);
                showAlert(a);
            }
        }else if(cmd == exitCommand){
            exit();
        }
    }
    //顯示錯誤，警告等提示信息
    private void showAlert(Alert alert){
        display.setCurrent(alert,main);
    }
    
    private void exit(){
        destroyApp(true);
        notifyDestroyed();
    }
}