[android-developers] Re: Odd Gallery onFling() behavior...

Woops... one thing I just noticed. The if statement in my onDown()
method is no longer there. I used to be using onTouch() instead which
is why it was there.

On Feb 23, 1:07 am, MagouyaWare <magouyaw...@gmail.com> wrote:
> I have searched this forum and StackOverflow and wasn't able to come
> up with anything for the problem I am facing.
>
> I have subclassed Gallery because I wanted to be able to implement a
> vertical fling of items in the gallery (as a way to remove them).
> Obviously I still want the horizontal fling to work
>
> The problem I am running into is that onFling does not always get
> called for some reason when my fling is vertical.  Just doing a
> straight vertical fling does not enter the onFling method.  However,
> if I move slightly to the left or right and then fling vertically I
> get into the onFling method and everything works as expected.
>
> I am using the following code in my Gallery subclass to achieve this:
>
> @Override
> public boolean onFling(MotionEvent e1, MotionEvent e2, float
> velocityX, float velocityY)
> {
>         if (m_curTouchPos == NO_CURRENT_TOUCH_POS || m_callback == null)
>                 return super.onFling(e1, e2, velocityX, velocityY);
>
>         float e1x = e1.getX();
>         float e1y = e1.getY();
>         float e2x = e2.getX();
>         float e2y = e2.getY();
>
>         float offPath = Math.abs(e1x - e2x);
>         float distance = Math.abs(e1y - e2y);
>
>         if (offPath < s_swipeMaxOffPath &&
>                 //Math.abs(velocityY) >= s_swipeMinVelocity &&
>                 distance >= s_swipeMinDistance)
>         {
>                 if (e1y > e2y)
>                 {
>                         m_callback.onSwipeUp(m_curTouchPos);
>                 }
>                 else if (e2y > e1y)
>                 {
>                         //TODO: IMPLEMENT THIS
>                         //m_callback.onSwipeDown(m_curTouchPos);
>                 }
>         }
>
>         m_curTouchPos = NO_CURRENT_TOUCH_POS;
>         return super.onFling(e1, e2, velocityX, velocityY);
>
> }
>
> @Override
> public boolean onDown(MotionEvent eve)
> {
>         if (eve.getAction() == MotionEvent.ACTION_DOWN)
>                 m_curTouchPos = pointToPosition((int)eve.getX(), (int)eve.getY());
>
>         return super.onDown(eve);
>
> }
>
> What am I doing wrong?
>
> Thanks in advance,
> Justin

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