How to make a J2ME application run in Background?

Question

I have a written a J2ME application which uses Bluetooth and search a file within the peer mobile and download it. I would like to make my application run in background , whenev

Answer 1

A device's ability to run an application in the background depends on its ability to multitask. Therefore, more expensive, PDA-type devices are more likely to support background execution than lower-cost devices. For in background :-

private Display display = Display.getDisplay(this);
private Displayable previousDisplayable;

public void toBack() {
previousDisplayable = display.getCurrent();
display.setCurrent(null);
}

And to come in Fore ground :-

public void toFront() {
display.setCurrent(previousDisplayable);
}

But be aware that it not supports every device.(Works on Nokia s60, SonyEricsson, but not on Nokia s40, Samsung and some others).