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

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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