Implicit List
/*--------------------------------------------------
* ImplicitList.java
*
* Example from the book: Core J2ME Technology
* Copyright John W. Muchow http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ImplicitList extends MIDlet implements CommandListener
{
private Display display; // Reference to Display object
private List lsDocument; // Main list
private Command cmExit; // Command to exit
private Command cmAdd; // Command to add an element
public ImplicitList()
{
display = Display.getDisplay(this);
// Create the Commands
cmExit = new Command("Exit", Command.EXIT, 1);
cmAdd = new Command("Add", Command.SCREEN, 1);
try
{
// Create array of image objects
Image images[] = {Image.createImage("/ff.png"),
Image.createImage("/rr.png"),
Image.createImage("/new.png")};
// Create array of corresponding string objects
String options[] = {" Next", " Previous", " New"};
// Create list using arrays, add commands, listen for events
lsDocument = new List("Document Option:",
List.IMPLICIT, options, images);
lsDocument.addCommand(cmExit);
lsDocument.addCommand(cmAdd);
lsDocument.setCommandListener(this);
}
catch (java.io.IOException e)
{
System.err.println("Unable to locate or read .png file");
}
}
public void startApp()
{
display.setCurrent(lsDocument);
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional)
{
}
public void commandAction(Command c, Displayable s)
{
// If an implicit list generated the event
if (c == List.SELECT_COMMAND)
{
switch (lsDocument.getSelectedIndex())
{
case 0:
System.out.println("Next");
break;
case 1:
System.out.println("Previous");
break;
case 2:
System.out.println("New");
break;
default:
System.out.println("New Element");
}
}
else if (c == cmAdd)
{
try
{
System.out.println("lsDocument.size():" + lsDocument.size());
// Add a new element. Using size() as the insertion point,
// the element will appended to the list.
lsDocument.insert(lsDocument.size(), " Delete ",
Image.createImage("/delete.png"));
}
catch (java.io.IOException e)
{
System.err.println("Unable to locate or read .png file");
}
}
else if (c == cmExit)
{
destroyApp(false);
notifyDestroyed();
}
}
}
Related examples in the same category
