Blackberry - How to make a clock count down and display on screen - blackberry

Question

I am making a quiz application with question and answer.
I want to make an clock count down ( Minute + Second ) and display it on screen.
But I can not how to do that.
Can anyone help me please ?

Answer 1

this is one solution to print time mm:ss format (Minutes:seconds)
public class StartUp extends UiApplication{
public static void main(String[] args) {
StartUp start=new StartUp();
start.enterEventDispatcher();
}
public StartUp() {
pushScreen(new Timerscreen());
}
}
class Timerscreen extends MainScreen
{
LabelField time;
long mille=0;
Timer timer=null;TimerTask task=null;
public Timerscreen() {
mille=1000*60*1;
time=new LabelField();
add(time);
timer=new Timer();
task=new TimerTask() {
public void run() {
synchronized (UiApplication.getEventLock()) {
if(mille!=0){
SimpleDateFormat date=new SimpleDateFormat("mm:ss") ;
System.out.println("================="+date.formatLocal(mille)+"====================="+Thread.activeCount());
time.setText(date.formatLocal(mille));
mille=mille-1000;
}else{
time.setText("00:00");
mille=1000*60*1;
timer.cancel();
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.inform("Time expaired");
}
});
}
}
}
};
timer.schedule(task,0, 1000);
}
}

Answer 2

Same like above but some change:
First set:
int secs=120; // how many seconds you want;
public void callTheTimer()
{
label=new LabelField("\t");
add(label);
timer=new Timer();
timerTask=new TimerTask()
{
public void run()
{
synchronized (UiApplication.getEventLock())
{
if(secs!=0)
{
label.setText(""+(secs--)+" secs");
}
else
{
timer.cancel();
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
label.setText("");
Dialog.alert("Times Up");
secs=120;
}
});
}
}
}
};
timer.schedule(timerTask, 0, 1000);
}
This is enough;