blackberry: AbsoluteFieldManager dont show custom fields - user-interface

Question

I'm trying to make a menu with an absolute layout that contains custom items extending Field. This items show well in the HorizontalFieldManager for example, but with the AbsoluteFieldManager it just shows a blank screen.
This is my code so far:
/********************
* CustomField.java *
********************/
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Keypad;
public class CustomField extends Field {
Bitmap img;
String s1, s2;
Font font;
int textColorUnfocused, textColorFocused, bgColorUnfocused, bgColorFocused;
public CustomField(long style) {
super(style);
}
public CustomField(Bitmap img, String s1, String s2) {// , long style) {
// super(style);
this.img = img;
this.s1 = s1;
this.s2 = s2;
this.font = Font.getDefault();
textColorUnfocused = 0x000000;
textColorFocused = 0xffffff;
bgColorUnfocused = 0xffffff;
bgColorFocused = 0x3956F7;
}
protected void layout(int maxWidth, int maxHeight) {
Font font = getFont();
int width = img.getWidth() + 10;
int height = img.getHeight() + (font.getHeight() * 3);
setExtent(Math.min(width, maxWidth), Math.min(height, maxHeight));
}
protected void onFocus(int direction) {
super.onFocus(direction);
invalidate();
}
protected void onUnfocus() {
super.onUnfocus();
invalidate();
}
public boolean isFocusable() {
return true;
}
protected void paint(Graphics g) {
// Draw background
g.setColor(isFocus() ? bgColorFocused : bgColorUnfocused);
g.fillRect(0, 0, getWidth(), getHeight());
// draw image
g.drawBitmap(5, 5, img.getWidth(), img.getHeight(), img, 0, 0);
g.setColor(isFocus() ? textColorFocused : textColorUnfocused);
// draw text
g.drawText(s1, ((img.getWidth() + 10) / 2) - (font.getAdvance(s1) / 2),
img.getHeight() + font.getHeight());
g.drawText(s2, ((img.getWidth() + 10) / 2) - (font.getAdvance(s2) / 2),
img.getHeight() + (2 * font.getHeight()));
}
protected boolean keyChar(char character, int status, int time) {
if (character == Keypad.KEY_ENTER) {
fieldChangeNotify(0);
return true;
}
return super.keyChar(character, status, time);
}
public int getY() {
return img.getHeight() + (font.getHeight() * 3);
}
public int getX() {
return img.getWidth();
}
}
/**************
* MyApp.java *
**************/
import net.rim.device.api.ui.UiApplication;
public class MyApp extends UiApplication{
public static void main(String args[]){
MyApp theApp = new MyApp();
theApp.enterEventDispatcher();
}
public MyApp()
{
// Push a screen onto the UI stack for rendering.
pushScreen(new MyScreen());
}
}
/*****************
* MyScreen.java *
*****************/
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.container.AbsoluteFieldManager;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.MainScreen;
public class MyScreen extends MainScreen {
public MyScreen() {
AbsoluteFieldManager manager = new AbsoluteFieldManager();
Bitmap img = Bitmap.getBitmapResource("1.png");
CustomField cf1 = new CustomField(img, "an", "Item");
CustomField cf2 = new CustomField(img, "another", "Item");
manager.add(cf1, 10, 10);
manager.add(cf2, 150, 150);
//HorizontalFieldManager hfm = new HorizontalFieldManager(
// Manager.HORIZONTAL_SCROLL);
//hfm.add(cf1); hfm.add(cf2);
//add(hfm);
add(manager);
}
}
And the image (1.png) http://www7.pic-upload.de/14.05.11/rhr4jcfuy9f8.png
How can I get the absolute manager to show my custom field?

Answer 1

My guess is that maybe AbsoluteFieldManager is passing 0, 0 to the layout method of your custom field. So your logic in there is calling setExtent(0, 0).