Thanks much. I had found something similar elsewhere in my searching, and as
you ended up making a subclass of SimpleOnGestureListener. As it happens, I
made that class inside of my primary Activity class, so I didn't have to pass
the object into the instantiator like you did, but the same "have to work back
into the main object" effectively applies, and I see your point.
If I get to a point where I'm willing to ignore the 1.5 OS revision, I'll see
what else can be done with the new gestures support added in API level 4...
- Chris
On May 25, 2010, at 3:50 AM, Justin Anderson wrote:
> I know this is late, but hopefully it will help you and others out there
> still programming stuff to be compatible with 1.5... This is a simplified
> version of a class that I use to detect a vertical swipe on a Gallery object.
> To see it in action and test it out you can take a look at "AppSwipe!" on
> the market (It's free...)
>
> In order to get the swipe working exactly the way you want it to you may have
> to fiddle around with the three integers used for detecting a swipe.
>
> public class GallerySwipeUpDetector extends SimpleOnGestureListener
> implements OnTouchListener
> {
> private Gallery m_gallery;
> GestureDetector m_detector;
> int m_swipeMaxOffPath; //Maximum horizontal tolerance for detecting a
> vertical swipe
> int m_swipeMinDistance; //Minimum distance in order to detect a vertical
> swipe
> int m_swipeMinVelocity; //Minimum velocity (pixels/second) in order to
> detect a vertical swipe
>
> public GallerySwipeUpDetector(Gallery gallery)
> {
> m_gallery = gallery;
> m_detector = new GestureDetector(this);
> m_swipeMaxOffPath = 25;
> m_swipeMinDistance = 10;
> m_swipeMinVelocity = 10;
> }
>
> @Override
> public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
> float velocityY)
> {
> if (Math.abs(e1.getX() - e2.getX()) < m_swipeMaxOffPath &&
> e1.getY() - e2.getY() >= m_swipeMinDistance &&
> Math.abs(velocityY) >= m_swipeMinVelocity)
> {
> int pos = m_gallery.pointToPosition((int)e1.getX(),
> (int)e1.getY());
> int firstPos = m_gallery.getFirstVisiblePosition();
> int viewablePos = pos - firstPos;
> View swipedView = m_gallery.getChildAt(viewablePos);
>
> if (swipedView != null)
> executeSwipeUpAction(pos);
>
> return true;
> }
>
> return false;
> }
>
> protected void executeSwipeUpAction(int pos)
> {
> //Do stuff
> }
>
> @Override
> public boolean onTouch(View v, MotionEvent event)
> {
> return m_detector == null ? false : m_detector.onTouchEvent(event);
> }
> }
>
> I would then use this class as follows:
>
> Gallery myGallery = (Gallery) findViewById(R.id.myGalleryID);
> myGallery.setOnTouchListener(new GallerySwipeUpDetector(myGallery));
>
> There may be a better way to do this, but this worked for me. If someone
> else has another solution that works better then I would be interested as
> well. I really don't like having to call a method on my gallery and pass it
> in as an argument to my listener (I think it's ugly and probably a poor
> design), but that was the only thing I could think of to do and it works.
>
> Hope this helps,
> Justin
>
> ----------------------------------------------------------------------
> There are only 10 types of people in the world...
> Those who know binary and those who don't.
> ----------------------------------------------------------------------
>
>
> On Fri, May 21, 2010 at 3:31 PM, Justin Anderson <magouyaw...@gmail.com>
> wrote:
> It is admittedly difficult to get it to work in 1.5...
>
> I have implemented it for my app on the market (AppSwipe!) but it was not
> easy. It might be a day or two before I have a chance to sit down and look
> at my code but as soon as I can, I will post something here to at least point
> you in the right direction.
>
> Thanks,
>
> Justin
>
> ----------------------------------------------------------------------
> There are only 10 types of people in the world...
> Those who know binary and those who don't.
> ----------------------------------------------------------------------
>
>
> On Tue, May 18, 2010 at 11:58 AM, Chris Ross <cross+goo...@distal.com> wrote:
>
> Hi there. When searching for information about how to code up recognition
> of a finger swipe across the screen, I find most references to the Gesture
> API added in API level 4 (OS 1.6). However, there are still quite a few
> devices (The HTC Droid Eris, for example. And the ole G1.) that are running
> 1.5.
>
> The rest of my app is working just fine requiring only API level 3, but I
> would like to add swipe recognition. The home screens on the afore-mentioned
> OS 1.5 devices detect swipes to go across pages, so it must be possible in
> there somewhere. It is just that it's really hard before the API level 4
> Gesture code came in, or is it really effectively not possible?
>
> Can anyone tell me how to detect swipes (just a directional swipe left or
> right across the screen) in OS 1.5 (API level 3, or below) ?
>
> Thanks...
>
> - Chris
>
>
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