mainclass.java

Mobile Services

import javax.microedition.midlet.MIDlet; 
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
/*	This class is the first class to be invoked.This class internally calls three different MIDlets
	depending on the item selected 
*/
public class MainClass extends MIDlet implements CommandListener
{
	/*	This list object will contains the Services */
 	private List menu = null;
 	/*	Display object declared */
 	private Display displaymenu = null;
 	/*	MovieList object declared. The movielist class is a MIDlet which will make the user book movie
	tickets */
 	MoviesList bookmovie = null;
 	/*	News object declared. The News class is a MIDlet which will make the user read news  */
  	News readnews = null;
  	/*	Weather object declared. This class is also a MIDlet which will give the user weather 
	details based on the city selected */
  	Weather seeweather = null;
  	/* Command object declared  */
  	Command exit;
  	/* MainClass constructor declared */
  	public MainClass()
 	{
  		/* This will get the display object */
 		displaymenu = Display.getDisplay(this);
  		/* Exit command initialized */
  		exit = new Command("EXIT",Command.EXIT,1);
  	}
  	/* The startApp method declared */
  	public void startApp()
  	{
  		/* Initializing List */
  		menu = new List("Menu",List.IMPLICIT);
  		/* This will add three items in the list which are the services provided */
  		menu.append("Weather",null);
  		menu.append("Movies",null);
  		menu.append("News",null);
  		/* This will register the list for events handling */
  		menu.setCommandListener(this);
  		/* The list will be displayed to the user */
  		displaymenu.setCurrent(menu);
  		/* Exit command added to the list */
  		menu.addCommand(exit);
  	}
  	/* The pauseApp() method declared */
  	public void pauseApp()
  	{
  		System.out.println("pause app called");
  	}
  	/* The destroyApp() method declared */
  	public void destroyApp(boolean b)
  	{
  		menu = null;
  		displaymenu = null;
  		bookmovie = null;
  		readnews = null;
  		seeweather = null;
  	}
  	/* This method handles user events */
  	public void commandAction(Command c, Displayable d)
  	{
		/* This if condition is true if any item in the list is selected */
  		if(c == List.SELECT_COMMAND)
  		{
  			/* This String will contain the string representation of the item selected */
  			String menuselect = menu.getString(menu.getSelectedIndex());
  			/* The if condition is executed if the user selects "Weather". The weather MIDlet is 
  				initialized and its startApp() method is called
  			*/
			if(menuselect.equals("Weather"))
			{
				/* Weather MIDlet initialized two arguments passed to the constructor Display object
				and the object of MainClass */
				seeweather = new Weather(displaymenu,this);
				/* startApp() method called */
				seeweather.startApp();
			}
			/* This if condition is executed if the user selects "Movies". The MovieList MIDlet is 
			initialized and its startApp() method is called
			*/
			if(menuselect.equals("Movies"))
			{
				/* MovieList MIDlet initialized two arguments passed to the constructor Display object
				and the object of MainClass */
				bookmovie = new MoviesList(displaymenu,this);
				/* startApp() method called */
				bookmovie.startApp();
			}
			/* This if condition is executed if the user selects "News". The MovieList MIDlet is 
			initialized and its startApp() method is called
			*/
			if(menuselect.equals("News"))
			{
			/* News MIDlet initialized two arguments passed to the constructor Display object
			and the object of MainClass */
			readnews = new News(displaymenu,this);
			/* startApp() method called */
			readnews.startApp();
			}
		}
		/* This if condition is true if the user press the button indicating "EXIT" */
	  	if(c == exit)
  		{
			/* destroyApp() method called */
  			destroyApp(true);
  			notifyDestroyed();
  		}
  	}
  	/* This method is to get the Display object back */
  	public void getDisplayObject(Display dis)
  	{
  		displaymenu = dis;
  		displaymenu.setCurrent(menu);
  	}
}