Free Source Code

This example shows how to create a Gauge tracker in MIDP.

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class GaugeTracker extends MIDlet
            implements ItemStateListener, CommandListener {

        private Gauge mGauge;
        private StringItem mStringItem;

        public GaugeTracker() {
            int initialValue = 3;
            mGauge = new Gauge("GaugeTitle", true, 5, initialValue);
            mStringItem = new StringItem(null, "[value]");
            itemStateChanged(mGauge);
        }

        public void itemStateChanged(Item item) {
            if (item == mGauge) {
                mStringItem.setText("Value = " + mGauge.getValue());
            }
        }

        public void commandAction(Command c, Displayable s) {
            if (c.getCommandType() == Command.EXIT) {
                notifyDestroyed();
            }
        }

        public void startApp() {
            Form form = new Form("GaugeTracker");
            form.addCommand(new Command("Exit", Command.EXIT, 0));
            form.setCommandListener(this);
            // Now add the selected items.
            form.append(mGauge);
            form.append(mStringItem);
            form.setItemStateListener(this);
            Display.getDisplay(this).setCurrent(form);
        }

        public void pauseApp() {
        }

        public void destroyApp(boolean unconditional) {
        }
    }

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