Hi, It looks like a bug in the VelocityTracker. Can you please file it at b.android.com? Thanks
On Tue, Mar 31, 2009 at 10:28 AM, focuser <[email protected]> wrote: > > Hi, > > I'm trying to use a GestureDetector in a subclass of FrameLayout, > which has a child ListView. > But it seems the GestureDetector has some side effect which causes > abnormal scrolling behaviors for the child ListView, e.g. sometime > when flinging down, the list actually scrolls upwards; when the list > is being flung (i.e. the scrolling animation is still playing) and you > press and hold on the list, the scroling stops (which is normal), but > as soon as you release, the list scrolls. > > The code for the layout is shown below. Apparently it actually does > nothing extra but calling GestureDetector.onTouchEvent(). If the line > "boolean handled = mGestureDetector.onTouchEvent(ev);" is commented > out, the child ListView will scroll as normal. Is it because the call > to onTouchEvent() takes some time that confuses the child ListView? > > Also, it seems this problem only occurs when the list item is complex, > e.g. consisting of multiple ImageViews, TextView etc. Everything > works fine if it's just a list of TextView's. > > public class MyLayout extends FrameLayout implements OnGestureListener > { > ... > �...@override > public boolean dispatchTouchEvent(MotionEvent ev) { > boolean handled = mGestureDetector.onTouchEvent(ev); > return super.dispatchTouchEvent(ev); > } > > public void onShowPress(MotionEvent e) { > } > > public boolean onSingleTapUp(MotionEvent e) { > return false; > } > > public void onLongPress(MotionEvent e) { > } > > public boolean onDown(MotionEvent e) { > return false; > } > > public boolean onFling(MotionEvent e1, MotionEvent e2, float > velocityX, > float velocityY) { > return false; > } > > public boolean onScroll(MotionEvent e1, MotionEvent e2, float > distanceX, > float distanceY) { > return false; > } > } > > > > > -- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
