Adding animation to a button in BlackBerry - animation

Question

I want to use animation on a Button that I created in my BlackBerry App. The animation works fine the first time when I click the button. On first click, the button starts animation (blinking). On second click the blinking stops. However, when I click the button again (third time), the blinking should start again. However, I get an error:
App Error 104 Uncaught: IllegalStateException
The code for creating the Button and adding animation is as follows:
final Bitmap image000 = Bitmap.getBitmapResource("panic.png");
final Bitmap image001 = Bitmap.getBitmapResource("panicon.png");
final Timer animationTimer = new Timer();
final BitmapField animationField = new BitmapField(image000,BitmapField.FOCUSABLE){
protected boolean navigationClick(int status, int time)
{
if(flag){
animationTask.cancel();
flag=false;
}else{
animationTimer.scheduleAtFixedRate(animationTask, 0, 100);
flag=true;
}
return true;
}
};
animationTask = new TimerTask() {
public void run() {
if(counter == 0){
animationField.setBitmap(image000);
}
if(counter == 1){
animationField.setBitmap(image001);
counter = -1;
}
counter++;
}
};
add(animationField);
EDIT: I debugged my code and the error occurs in the loop that starts the thread. Cancelling the thread seems fine. I am lost what is the issue. Please guide.

Answer 1

try this -
TimerTask animationTask;
BitmapField animationField;
final Bitmap image000 = Bitmap.getBitmapResource("panic.png");
final Bitmap image001 = Bitmap.getBitmapResource("panicon.png");
final Timer animationTimer = new Timer();
animationField = new BitmapField(image000,BitmapField.FOCUSABLE){
protected boolean navigationClick(int status, int time)
{
if(flag){
animationTask.cancel();
flag=false;
}else{
animationTask = new TimerTask() {
public void run() {
if(counter == 0){
animationField.setBitmap(image000);
}
if(counter == 1){
animationField.setBitmap(image001);
counter = -1;
}
counter++;
}
};
animationTask.run();
animationTimer.scheduleAtFixedRate(animationTask, 0, 100);
flag=true;
}
return true;
}
};
animationTask = new TimerTask() {
public void run() {
if(counter == 0){
animationField.setBitmap(image000);
}
if(counter == 1){
animationField.setBitmap(image001);
counter = -1;
}
counter++;
}
};
add(animationField);