Implementing the MIDlet FileItem class

To implement the FileItem class:

1. Create the FileItem.java class file.

2. Import the required packages and classes.

   import javax.microedition.lcdui.CustomItem;
   import javax.microedition.lcdui.Font;
   import javax.microedition.lcdui.Graphics;
   
   import com.nokia.mid.ui.FileSelectDetail;
   

3. Set FileItem class to extend CustomItem.

   public class FileItem extends CustomItem {

4. 4. Create the required variables and constants.

   private static final int ITEM_WIDTH = 240;
   private static final int MARGIN = 5;
   private static final int TEXT_COLOR_NOT_SELECTED = 0x595959;
   private static final int TEXT_COLOR_SELECTED = 0xfdfefe;
   private static final int HILIGHT_COLOR = 0x29a7cc;
   private static final int BACKGROUND_COLOR = 0xf4f4f4;
   
   private FileSelectDetail fileDetails = null;
   private Listener listener = null;
   private int fontHeight = 0;
   private int height = 0;
   private boolean isSelected = false;

5. Create the constructor and corresponding listener.

   public FileItem(FileSelectDetail fileDetails, Listener listener)
   throws IllegalArgumentException
   {
       super(null);
   
       if (fileDetails == null) {
           throw new IllegalArgumentException(
               "The given FileSelectDetail object cannot be null!");
       }
   
       this.fileDetails = fileDetails;
       this.listener = listener;
   
       setLabel(fileDetails.displayName);
   
       fontHeight = Font.getDefaultFont().getHeight();
       height = fontHeight * 3 + MARGIN * 2; // Name, MIME type, size
       System.out.println("FileItem::FileItem(): height == " + height);
   }

6. Create the getFileDetails method to retrieve fileDetails.

   public FileSelectDetail getFileDetails() {
       return fileDetails;
   }

7. Create the setIsSelected method to select/deselect the item.

   public void setIsSelected(boolean isSelected) {
       if (this.isSelected != isSelected) {
           this.isSelected = isSelected;
           repaint();
       }
   }

8. Implement the methods from CustomItem interface.

   protected int getMinContentHeight() {
       return height;
   }
   
   protected int getMinContentWidth() {
       return ITEM_WIDTH;
   }
   
   protected int getPrefContentHeight(int arg0) {
       return height;
   }
   
   protected int getPrefContentWidth(int arg0) {
       return ITEM_WIDTH;
   }
   
   protected void pointerPressed(int x, int y) {
       if (listener != null) {
           listener.onPressed(this);
       }
   }
   
   protected void pointerReleased(int x, int y) {
       if (listener != null) {
           listener.onReleased(this);
       }
   }
   
   protected void paint(Graphics graphics, int width, int height) {
       if (isSelected) {
           graphics.setColor(HILIGHT_COLOR);
       }
       else {
           graphics.setColor(BACKGROUND_COLOR);
       }
   
       graphics.fillRect(0, 0, ITEM_WIDTH, height);
   
       if (isSelected) {
           graphics.setColor(TEXT_COLOR_SELECTED);
       }
       else {
           graphics.setColor(TEXT_COLOR_NOT_SELECTED);
       }
   
       final int anchor = Graphics.TOP | Graphics.LEFT;
       graphics.drawString("Name: " + fileDetails.displayName, MARGIN, MARGIN, anchor);
       graphics.drawString("MIME Type: " + fileDetails.mimeType, MARGIN, MARGIN + fontHeight, anchor);
       graphics.drawString("Size: " + fileDetails.size, MARGIN, MARGIN + fontHeight * 2, anchor);
   }

9. Create the Listener interface to get notified when an item receives touch input.

   public interface Listener {
       void onPressed(FileItem fileItem);
       void onReleased(FileItem fileItem);
   }