how to check timer is running on blackberry - blackberry

Question

I've add timer to display images in my app.
is there any way to check the timer is running or not.?
after checking , the timer should be cancel using timer.cancel() method.
Pls hlp me.

Answer 1

Blackberry's Timer is very cheesy - it's just like a Runnable with Thread.sleep() inside. Very commonly for Blackberry, it contains lot of crap you don't actually need and doesn't contain things you do need.
I would dump the Timer and make a class specially for my needs:
abstract public class MyTimer extends Thread {
private final Object waitobj = new Object();
private volatile boolean running;
private volatile boolean canceled;
private final long due;
public MyTimer setDelay(long delay) {
long cur = System.currentTimeMillis();
due = cur + delay;
return this;
}
public MyTimer setAlarmTime(long dueTimeMillis) {
due = dueTimeMillis;
return this;
}
synchronized void setIsRunning(boolean running) {
this.running = running;
}
synchronized public boolean isRunning() {
return running;
}
synchronized public void cancel() {
synchronized (waitobj) {
canceled = true;
waitobj.notify();
}
}
public void run() {
setIsRunning(true);
long cur = System.currentTimeMillis();
long sleep = due - cur;
while (sleep > 0) {
synchronized (waitobj) {
waitobj.wait(sleep);
}
if (isCanceled()) return;
cur = System.currentTimeMillis();
sleep = due - cur;
}
alarm();
setIsRunning(false);
}
private boolean isCanceled() {
return canceled;
}
abstract void alarm();
}
Then I would invoke it like this:
timer = new MyTimer() {
void alarm() {
// do cool things
}
};
timer.setDelay(10000).start();
If I need to cancel it I would do it like this:
if (timer.isRunning()) {
timer.cancel();
}
or simply
timer.cancel();
PS: Note volatile and synchronized things in MyTimer class.

Answer 2

You can manage this yourself by recording the timers unique integer and use it later to cancel. I find a useful place to set/cancel this is in the onVisibilityChanged(boolean) override. I'm assuming here your timed images are for animation.
// start
if (renderLoop==-1) renderLoop = UiApplication.getUiApplication().invokeLater( this, 50, true );
// stop
if (renderLoop!=-1)
{
UiApplication.getUiApplication().cancelInvokeLater( renderLoop );
renderLoop = -1;
}
//assumes your screen implements Runnable
public void run() {
// do something cool
}

Answer 3

Assuming that you're programming in Java with Swing, you have a method called isRunning() within the Timer Class.
http://download.oracle.com/javase/7/docs/api/javax/swing/Timer.html#isRunning%28%29
Regards