Implementing the MIDlet Main class

The Main class is the MIDlet main class. When the MIDlet is launched, the Main class is loaded first.

To implement the Main class:

1. Create the Main.java class file.

   package com.nokia.example.fileselectexample;

2. Import the required classes and packages.

   import javax.microedition.lcdui.Alert;
   import javax.microedition.lcdui.Display;
   import javax.microedition.midlet.MIDlet;
   

3. Create the Main class to extend the MIDlet.

   public class Main extends MIDlet {

4. Create the required variables and the constructor. Check availability of the File Select API using System.getProperty method.

   private MainView mainView;
   private final boolean isAPIAvailable;
   public Main() {
       isAPIAvailable = System.getProperty("microedition.io.file.FileConnection.version") != null;
   }

5. Define the mandatory lifecycle methods for starting, pausing, and destroying the MIDlet.

   public void startApp() {
       if (isAPIAvailable) {
           mainView = new MainView("File Select Example", this);
           Display.getDisplay(this).setCurrent(mainView);
       }
       else {
           String text = getAppProperty("MIDlet-Name") + "\n"
                         + getAppProperty("MIDlet-Vendor")
                         + "\nFile Connection API is not available!";
           Alert alert = new Alert(text);
           Display.getDisplay(this).setCurrent(alert);
       }
   }
   public void pauseApp() {
   }
   public void destroyApp(boolean unconditional) {
   }

6. Create the method to exit the application.

   public void quit() {
       destroyApp(true);
       notifyDestroyed();
   }