Creating Volume Bar Using Gauge Class
This example is all about creating a volume bar using Gauge class. We are
creating the
object of Gauge class that contains the following parameters label, interactive, maxValue
and initialValue and it has been set with the form. We can also set
the new volume label, if the interactive status is true. But if the status
is set as false then we can not change the value of bar label. The following
code is used to create the gauge and to display the current status:
gauge = new Gauge("Volume", true, 5, 2);
sitem = new StringItem(null, "[value]");
itemStateChanged(gauge);
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The Application is as follows:
Source Code of VolumeExample.java
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class VolumeExample extends MIDlet implements ItemStateListener, CommandListener{
private Form form;
private Display display;
private Command exit;
private Gauge gauge;
private StringItem sitem;
public VolumeExample(){
gauge = new Gauge("Volume", true, 5, 2);
sitem = new StringItem(null, "[value]");
itemStateChanged(gauge);
}
public void startApp(){
Form form = new Form("GaugeExample");
exit = new Command("Exit", Command.EXIT, 0);
display = Display.getDisplay(this);
form.append(gauge);
form.append(sitem);
form.addCommand(exit);
form.setCommandListener(this);
form.setItemStateListener(this);
display.setCurrent(form);
}
public void itemStateChanged(Item item){
if (item == gauge){
sitem.setText("Volume Label = " + gauge.getValue());
}
}
public void pauseApp(){}
public void destroyApp(boolean unconditional){
notifyDestroyed();
}
public void commandAction(Command c, Displayable s){
String label = c.getLabel();
if (label.equals("EXIT")){
destroyApp(false);
}
}
}
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