Blackberry JAVA DEVELOPMENT ENVIRONMENT - - DEVELOPMENT GUIDE Manual page 36

Development Guide
• net.rim.device.api.ui.Manager
• net.rim.device.api.ui.Screen
2. Create a class that extends the Manager class, the Screen class, the Field class, or one of the Field subclasses.
public class newButtonField extends ButtonField {
3. In your implementation of the touchEvent(TouchEvent message) method, invoke
TouchEvent.getEvent().
4. Check if the value that TouchGesture.getSwipeDirection() returns is equal to
TouchGesture.SWIPE_NORTH.
protected boolean touchEvent(TouchEvent message) {
switch(message.getEvent()) {
case TouchEvent.GESTURE:
TouchGesture gesture = message.getGesture();
switch(gesture.getEvent()) {
case TouchGesture.SWIPE:
if(gesture.getSwipeDirection() == TouchGesture.SWIPE_NORTH) {
Dialog.alert("Upward swipe occurred");
return true;
}
}
return false;
}
}
Respond to a user sliding a finger down quickly on the screen
1. Import the following classes:
• net.rim.device.api.ui.TouchEvent
• net.rim.device.api.ui.TouchGesture
• net.rim.device.api.ui.Field
• net.rim.device.api.ui.Manager
• net.rim.device.api.ui.Screen
2. Create a class that extends the Manager class, the Screen class, the Field class, or one of the Field subclasses.
public class newButtonField extends ButtonField {
3. In your implementation of the touchEvent(TouchEvent message) method, invoke
TouchEvent.getEvent().
4. Check if the value that TouchGesture.getSwipeDirection() returns is equal to
TouchGesture.SWIPE_SOUTH.
protected boolean touchEvent(TouchEvent message) {
switch(message.getEvent()) {
case TouchEvent.GESTURE:
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Touch screen events