You really don't want to paint on the background bitmap to show changing data.
One of the most obvious solutions is to have Fields for that - both LabelField and RichTextField are good for displaying text, BitmapField is good for displaying bitmaps (use setBitmap to change the image), GaugeField is great for percent indication, etc. Add the fields to your VerticalFieldManager, use margins and style bits such as FIELD_HCENTER to space and position them the way you like and enjoy. When a new value to be displayed comes, change the corresponding field and invalidate it. This is the right way of doing such stuff.
Of course - since you seem to be fixated on using Graphics directly - the quick and dirty approach is just to paint on the screen directly, using the Graphics object passed into paint(). Something like this:
fBackground = Bitmap.getBitmapResource("background.png")
// fGraphics = new Graphics (fBackground );
fvm1 = new VerticalFieldManager()
{
public void paint(Graphics graphics)
{
// fGraphics.drawText(fText, 0, 0);
graphics.drawBitmap(0, 0, fBackground.getWidth(), fBackground.getHeight(), fBackground, 0, 0);
graphics.drawText(fText, 0, 0); // plus any other draws...
super.paint(graphics);
}
}
Of course, you also need to override that VerticalFieldManager's sublayout() to set its dimensions properly.
However, doing it this way is really strange. Either you need something much simpler than a VerticalFieldManager to paint in it (extend Field, override its layout() to setExtent() properly and its paint() to do whatever painting you need - do not call super.paint(), it's abstract) or you need to add Fields to it as usual and let super.paint() do its job.
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@jcarty
