Touch Event Blackberry Triggered Multiple Times

问题

I'm working with the Blackberry Touch Event and I need to process the TouchEvent.MOVE, TouchEvent.UP and TouchEvent.DOWN to move a carousel of images and the TouchEvent.CLICK to generate some specific action.

My problem is that the touchEvent() method is being called several times. How can I prevent this? Because the behaviour is getting all messed up.

For example: when I just want to capture the TouchEvent.CLICK event, the UP-DOWN-MOVE-CLICK are being triggered one after the next.

My code does the following:

protected boolean touchEvent(TouchEvent message) {

    if (message.getEvent() == TouchEvent.CLICK) {

        //CHANGE THE CONTENT OF A FIELD

        return true;
    } else if ((message.getEvent() == TouchEvent.MOVE)
            || (message.getEvent() == TouchEvent.UP)
            || (message.getEvent() == TouchEvent.DOWN)) {

        //DELETE THE FIELD
                            //MOVE A CAROUSEL OF IMAGES
    } else {
        return false;
    }
}

public void moverTouch(int dx) {
    //ADD THE FIELD PREVIOUSLY DELETED
}

As you can see, when the CLICK event is captured, I need to change the content of a field, but when the MOVE or UP or DOWN event is captured, I need to delete that Field from his manager, do some working with a carousel of images, and then re-add the field previously deleted.

The carousel moving part works fine, but when I try to capture JUST the CLICK event, and the others are being triggered as well, but the moverTouch() function doesn't get triggered because there is no actual movement on the carousel of images, I end up with a deleted field that I need to update its content.

回答1:

At a glance:

I think you need to differentiate touch gestures (I believe you are "listening" for something like a swipe gesture to scroll the gallery image) from "normal" touch events (specifically you need to process TouchEvent.CLICK to apply "some specific action" to the clicked image).

To decide whether the TouchEvent represents a gesture there is a TouchEvent.GESTURE constant. Then it is possible to know what exactly TouchGesture it represents by calling TouchEvent.getGesture().

Some sample code for touch gestures can be viewed here.

来源：https://stackoverflow.com/questions/16818850/touch-event-blackberry-triggered-multiple-times

标签

blackberry

touch-event