OK, but could you explain briefly why the GestureDetector would have such side effect? In the code above I don't see any events being stolen nor any new events being created. Original events are just passed to FrameLayout.dispatchTouchEvent as if there's no GestureDetector used.
I even tried the following but it makes no difference. public boolean dispatchTouchEvent(MotionEvent ev) { MotionEvent oldEv = ev.obtain(); boolean handled = mGestureDetector.onTouchEvent(ev); return super.dispatchTouchEvent(oldEv); } On Mar 31, 12:07 pm, Romain Guy <romain...@google.com> wrote: > Unfortunately I don't see any possible workaround :( > > > > On Tue, Mar 31, 2009 at 11:40 AM, focuser <linto...@gmail.com> wrote: > > > Thanks Romain, > > > I have just filed ithttp://code.google.com/p/android/issues/detail?id=2337. > > > But before it's fixed in a new release, is there any workaround or I > > will have to play with the VelocityTracker myself? > > > On Mar 31, 10:39 am, Romain Guy <romain...@google.com> wrote: > >> 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 <linto...@gmail.com> 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 > >> romain...@android.com > > >> 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 > > -- > Romain Guy > Android framework engineer > romain...@android.com > > 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 android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---