did you mess with the GestureDetector stuff? it handles some of the
determination of whether something is a scroll or fling, etc..
On Mon, May 23, 2011 at 11:39 PM, Spooky <spooky1...@gmail.com> wrote:
> As determined as I was to solve this without having to ask
> for help, I am now officially confused beyond all hope.....
>
> I've been digging, and digging, and diggin, through searches and
> sample code, trying to find out how to change images (next or
> previous) in an ImageView that displays one of many images at a
> time with just a swipe of my finger, either to the left (next) or
> right (previous). After finding a tutorial that appeared to do
> close to what I was looking for, I adapted it, and came up with
> the following (indentation trimmed for readability):
>
>
> // NOTE: This is inside of the ImageView
>
> private float startx = 0;
> private float endx = 0;
>
> public boolean onTouchEvent(MotionEvent event) {
> switch (event.getAction()) {
> case MotionEvent.ACTION_DOWN:
> // Remember our initial down event location.
> startx = event.getRawX();
> break;
> case MotionEvent.ACTION_MOVE:
> endx = event.getRawX();
> // Handle (next)
> if (endx < startx)
> mCurrentPhotoIndex = (mCurrentPhotoIndex + 1)
> % mPhotoIds.length;
> // Handle (prev)
> if (endx > startx) {
> mCurrentPhotoIndex = (mCurrentPhotoIndex - 1);
> if (mCurrentPhotoIndex < 0)
> mCurrentPhotoIndex = mPhotoIds.length - 1;
> showPhoto(mCurrentPhotoIndex);
> break;
> }
> }
> return true;
> }
>
> Obviously (well, it is NOW...), this resulted in each minute
> touch of the screen advancing (or going backwards) by a seemingly
> random number of images...as while I was still moving my finger
> across the image, it was constantly seeing more movement, and
> that triggered the MotionEvent again, and again, and again, and
> again, and ... {ad nauseum}. So I started looking for a way to
> tame this monster and get it under control.
>
> After reading more, and verifying something I thought I'd seen
> (ACTION_UP), I arrived at this:
>
> // NOTE: This is inside of the ImageView
>
> private float startx = 0;
> private float endx = 0;
>
> public boolean onTouchEvent(MotionEvent event) {
> switch (event.getAction()) {
> case MotionEvent.ACTION_DOWN:
> // Remember our initial down event location.
> startx = event.getRawX();
> return true; // first mod, this was still break;
> case MotionEvent.ACTION_MOVE:
> endx = event.getRawX();
> return true; // first mod, this was still break;
> // ADDED: wait for ACTION_UP, and THEN handle the event
> case MotionEvent.ACTION_UP:
> // Handle (next)
> if (endx < startx)
> mCurrentPhotoIndex = (mCurrentPhotoIndex + 1)
> % mPhotoIds.length;
> // Handle (prev)
> if (endx > startx) {
> mCurrentPhotoIndex = (mCurrentPhotoIndex - 1);
> if (mCurrentPhotoIndex < 0)
> mCurrentPhotoIndex = mPhotoIds.length - 1;
> showPhoto(mCurrentPhotoIndex);
> return true; // first mod, this was still break;
> }
> }
> return true;
> }
>
> Note the comments saying that on the first modification, each
> of the "return true;" statements in the switch statement were
> still left as "break;" ... and later changed to "return true;".
> It didn't change the behavior, but for the sake of completeness,
> I'm including that bit of info.
>
> Only one problem. ACTION_UP is apparently never caught. I even
> put in a test that bypasses the two if statements (btw, is there
> an "else" statement? how would I use it?) and advanced the image
> index by 10 ... nothing happened. No change.
>
> So at this point, while I'm not happy about not being able to
> solve this on my own, I am asking for help.
>
> Later,
> --jim
>
> --
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