Which GUI elements do I need to use in this example?

Hi,
I'm new to J2ME development, and i'm looking to make a simple MIDlet which retrieves a list of items via Bluetooth. The Bluetooth part of this is irrelevant for the time being, I would like to make a skeletal GUI for this system first. I know the things I require in the GUI, but i'm not sure what these are called under J2ME and how I link them together. These are the 5 stages I need in my GUI:
1. A screen is shown which just contains a PNG file, which acts as a splash screen. After a set amount of time, say 2 seconds, or when a key is pressed, this disappears and shows...
2. A "Searching..." alert. I can create simple alerts sign text and the info icon, but is it possible to add a Guage to this? It would be nice to have something moving to let the user know that the phone is searching. It is searching for the Bluetooth server to get the list of items from - but for now, this could just be timed for 2 seconds to similuate the searching process. When the server is found (or for this skeletal system, once the 2 seconds are up)...
3. A screen showing a list of items that have been retrieved. This will be an implicit list, and I think I can manage this part myself. When one of the items is selected, the MIDlet shows...
4. Another implicit list allowing them to select an option for that item, e.g. Yes, No, Maybe. When selected...
5. Another alert, "Selection recorded", and they are returned to stage 3.
I am confused by which items need to be in a Canvas, Screen, Form etc. I have the "Learning Wireless Java" book, which has helped a bit, but it doesn't give me much information on how to move from one "screen" to another. Would all of the above be in the same class, and I just switch between which screen is active?
I'm just looking for your ideas on how to best implement the above, as i'm stuck! All help is very much appreciated :)
Cheers,
Nick

There is no 1 way to implement anything. But to keep your program small, do not create too many classes.
For navigation, I generally like to keep a string that tracks which screen I'm in, and react accordingly. But that's personal preference.
Here's a slightly different way:
http://developers.sun.com/techtopics/mobility/midp/ttips/listdetail/index.html
1. A screen is shown which just contains a PNG file,
which acts as a splash screen. After a set amount of
time, say 2 seconds, or when a key is pressed, this
disappears and shows...Splash screens - I don't know if any other class allows you to display a screen for a specific amount of time other than an Alert. I usually use alerts... but link below is good reference for splash screens depending on what you're trying to achieve.
http://java.sun.com/developer/J2METechTips/2001/tt0820.html
2. A "Searching..." alert. I can create simple
alerts sign text and the info icon, but is it
possible to add a Guage to this? It would be nice to
have something moving to let the user know that the
phone is searching. It is searching for the
Bluetooth server to get the list of items from - but
for now, this could just be timed for 2 seconds to
similuate the searching process. When the server is
found (or for this skeletal system, once the 2
seconds are up)...You can add Gauges to Alerts. Use Alert.SetIndicator (gauge) for this.
I am confused by which items need to be in a Canvas,
Screen, Form etc. I have the "Learning Wireless
Java" book, which has helped a bit, but it doesn't
give me much information on how to move from one
"screen" to another. Would all of the above be in
the same class, and I just switch between which
screen is active?Canvas: low-level objects that allow the app to provide graphics and handle input
Screen: high level objs (ie. alert, textbox, list, form)
You can append any Item, Image or String to a form.
Examples of classes that inherit from javax.microedition.lcdui.Item would be StringItem, ChoiceGroup, Gauge, CustomItem, ImageItem.... etc.
Good luck!

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hasZeroValue = (HashMap<String, ArrayList<String>>) dataValues[1];
} else if(cropId.equalsIgnoreCase("MZ") && traitName.equalsIgnoreCase("Shelling")) {
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 traitAvg=getMaizeYeild(traitName, traitAvg, population, avg, hybrid, area);
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 traitAvg=tomatoYVMVCalculation(traitName, traitAvg,dataPoint, dataTraits, hybrid, repl, traitValues, dataPvalues);
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} else if(cropId.equalsIgnoreCase("OK") && traitName.equalsIgnoreCase("ELCV_60")) {Can anybody think of a way to make a generic approach to this?

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scale to decide growth of a seed of a particular crop.
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crops and take down n no of observation for each trait and upload in csv format.Once they enter
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