How do you locate a bug WITHOUT the emulator and the console?

Question

Hi.
I'm new here and my English is not perfect but I'll try my best to explain my problem.
I'm trying to port J2ME games to various mobile phone devices. I've no problem fixing bugs on Nokia, Sony Ericsson, or any models that offer an emulator and a console window.
*** The problem is: In some case, The same build runs fine on Nokia/Sony emulator, but crash/freeze on LG phones.
(this is just an example, it's not only LG phones that have this problem though)
I believe it is possible to locate the bug by:
- use the 'try/catch' block and print the error message using something like
g.drawString(e.toString(),0,0,0);
where 'g' and 'e' is a Graphics and Exception objects.
But I wonder if there's a way to print 'everything that should be printed on the console', on the phones's display. So we don't need to manually put try/catch block.
ok, to sum up the question.
Question:
1. Is there a way to print 'everything that will normally appear on the console', on the phones's screen?
2. If no, then I'll need to try/catch the problem.
But how can you use try/catch and "drawString" everywhere in the code?, while the actual drawing will be done only in the "paint()" method?
I'm thinking of using 'getGraphics().drawString' when using try/catch outside the paint() method. but what's the point if the actual drawing will be done only in paint() method anyway...
Sorry if it's a stupid question. I just started learning Java programming 3 months ago, let alone J2ME. >_<
Thank you. =)
/bow

Answer 1

Hi Kakyoin,
What I found was helpfull is creating a method in the MIDlet where you can display messages. For instance:
    public void createFormScreen(Alert alert) {
        // Set up the initial screen for the MIDlet
        Form formScreen = new Form("Your MIDlet name");
        firstScreen.append("Welcome to your MIDlet");
        myChoice = new ChoiceGroup(null, ChoiceGroup.EXCLUSIVE);
        myChoice.append("Your first choice", null);
        myChoice.append("Your second choice", null);
        formScreen .append(myChoice);
        formScreen .addCommand(OKCOMMAND);
        formScreen .addCommand(EXITCOMMAND);
        formScreen .setCommandListener(this);
        theListener = this;
        if (alert == null) {
             theDisplay.setCurrent(formScreen Screen);
        } else {
            theDisplay.setCurrent(alert, formScreen);
    }So, from your constructor call the createFormScreen method, and your initial screen will be displayed.
When an allert situation occurs in an object, call createFormScreen in a method like:
     protected void displayMessage(String title, String msg) {
          // Display the error message
          Alert error = new Alert(title, msg, null,
                    AlertType.ERROR);
          error.setTimeout(Alert.FOREVER);
          myMIDlet.createStartScreen(error);
     }Now the error message will be displayed on the screen indefenitaly. Off course your object where the error occurred should have a reference to the MIDlet object. I hope this helps you.
Maik