Source Code : Interactive Gauge

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Interactive Gauge

/*--------------------------------------------------
* InteractiveGauge.java
*
* Example from the book:     Core J2ME Technology
* Copyright John W. Muchow   http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class InteractiveGauge extends MIDlet implements CommandListener
{
  private Display display;   // Reference to display object 
  private Form fmMain;       // The main form
  private Command cmExit;    // Exit the form
  private Gauge gaVolume;    // Volume adjustment

  public InteractiveGauge()
  {
    display = Display.getDisplay(this);

    // Create the gauge and exit command
    gaVolume = new Gauge("Sound Level", true, 30, 4);
    cmExit = new Command("Exit", Command.EXIT, 1);
        
    // Create form, add commands, listen for events
    fmMain = new Form("");
    fmMain.addCommand(cmExit);
    fmMain.append(gaVolume);
    fmMain.setCommandListener(this);
  }

  // Called by application manager to start the MIDlet.
  public void startApp()
  {
    display.setCurrent(fmMain);
  }

  public void pauseApp()
  { }
  
  public void destroyApp(boolean unconditional)
  { }

  public void commandAction(Command c, Displayable s)
  {
    if (c == cmExit)
    {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}


           
       

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