Creating a javax.microedition.lcdui.Image on J2Se Application - image

Question

I have designed a component for J2Me, and here is the paint method:
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
class Component {
...
public void paint(Graphics g) {
if (background != null)
g.drawImage(image, bounds.getLocation().x, bounds.getLocation().y, 0);
}
...
}
I want to paint this component on a J2Se application, I tried to paint the component onto a J2Me Image and extracted the int[] into an InputStream, and create a new image on the J2Se platform, with this object:
public class ComponentStreamer {
private Component component;
private Image j2Me_Image;
public void setComponent(Component component) {
this.component = component;
}
public InputStream getInputStream() throws IOException {
if(component==null)
return null;
//THIS LINE THROWS THE EXCEPTION
j2Me_Image=Image.createImage(component.getSize().width, component.getSize().height);
component.paint(j2Me_Image.getGraphics());
return getImageInputStream(j2Me_Image);
}
}
I've tried the Object, but the commented line throws an exception:
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: javax.microedition.lcdui.ImmutableImage.decodeImage([BII)V
at javax.microedition.lcdui.ImmutableImage.decodeImage(Native Method)
at javax.microedition.lcdui.ImmutableImage.getImageFromStream(Image.java:999)
at javax.microedition.lcdui.ImmutableImage.<init>(Image.java:955)
at javax.microedition.lcdui.Image.createImage(Image.java:554)
How can over come this error?
Thanks,
Adam.

Answer 1

Well,
That was a very long process of diving into the sources of the J2Me MIDP and CLDC, and the use of a package called Microemulator, here is some code to get anyone else started:
this starts an emulator, which then enables some of the J2Me features.
private void setUpEmulator() {
try {
// overrideJ2MeImagePackageLock();
Headless app = new Headless();
DeviceEntry defaultDevice = new DeviceEntry("Default device", null, DeviceImpl.DEFAULT_LOCATION, true, false);
Field field = app.getClass().getDeclaredField("emulator");
field.setAccessible(true);
Common emulator = (Common) field.get(app);
emulator.initParams(new ArrayList<String>(), defaultDevice, J2SEDevice.class);
} catch (Exception e) {
e.printStackTrace();
System.out.println("Un-handled Exception");
}
}
Next we have few other nice objects to work with:
public class J2MeImageLayer extends ScalableLayer {
private static final long serialVersionUID = -4606125807092612043L;
public J2MeImageLayer() {
componentViewer.super();
}
#Override
public void repaint() {
J2SEMutableImage mutableImage = new J2SEMutableImage(page.getSize().width, page.getSize().height);
page.paint(mutableImage.getGraphics());
Graphics g = getImage().getGraphics();
g.drawImage(mutableImage.getImage(), 0, 0, DCP_Simulator.this);
}
public void addComponent(Component component) {
page.add(component);
}
public void setComponent(final Component component) {
page.removeAllElements();
final Container componentParent;
if ((componentParent = component.getParent()) != null)
component.setRemovedAction(new interfaces.Action() {
#Override
public void action() {
componentParent.add(component);
}
});
page.add(component);
}
}
and this is the highlight on how to do that.
Adam.