Thanks Piren!
Your answer led me into the right direction.
This was the problem:
The *ViewPager *contains *TextViews *as (grand-grand...) children. Before
it actually starts scrolling it asks if the touched child (or one of the
child's children) could scroll horizontally. If one of them does, the *
ViewPager* won't scroll horizontally itself. Instead, it lets this child
scroll.
The *TextView* implements a method called '*canScrollHorizontally(int)*'.
It uses the *mLayout *member to determine this method's return value.
Sometimes, the *mLayout.mWidth* is 0x00100000 (= 1048576) and this weird
value causes this *canScrollHorizontallly *method to incorrectly return *true
*(instead of *false*).
The method canScrollHorizontally is only available for API-level 14 or
up... this may explain the issue...
For now, I just subclass my *TextView* that appear in the *ViewPager *and
override the *canScrollHorizontally *method, because I know the text in
these *TextViews *can never scroll horizontally.
public class MyTextView extends TextView {
...
@Override
public boolean canScrollHorizontally(int direction) {
return false;
}
....
}
On Wednesday, October 10, 2012 9:38:03 AM UTC-4, Piren wrote:
>
> The thing is that being Clickable shouldn't have any impact in this
> scenario. Although a clickable view always consumes the touch event, in
> ViewPager's case it should intercept it when it recognizes a drag gesture
> (see its onInterceptTouchEvent implementation).
>
> You should override onTouch and onInterceptTouchEvent for all your custom
> views and use logs to see how the events propagate through them (the proper
> behavior would be the button intercepting onTouch and once your finger
> moves enough in the X axes it should stop getting that event)
>
> My best guess is that the ViewPager cancels the drag because it believes
> your views have horizontal scrolling - I didnt dig all the way through, but
> it seems to be basing that mostly on child view sizes... since you said you
> have custom layout logic, i'm thinking it makes the ViewPager return the
> wrong result. try debugging ViewPager's canScroll method.
>
> they also have this comment in there: " // TODO: Add versioned support
> here for transformed views. This will not work for transformed views in
> Honeycomb+ ) " Kind of suspicious :)
>
>
> On Tuesday, October 9, 2012 11:57:28 PM UTC+2, Streets Of Boston wrote:
>>
>> The targetSdk is 11.
>> This is our hierarchy:
>>
>> -ViewPager
>> |
>> +-NoSaveStateFrameLayout
>> |
>> +-ProfileGridView
>> |
>> +-ProfileGridViewRow
>> |
>> +-FrameLayout
>> |
>> +-TextView
>>
>> Note that ProfileGridView contains one or more ProfileGridViewRows which
>> contains one or more clickable TextView (i.e. our buttons).
>> The ProfileGridView and ProfileGridViewRow are custom LinearyLayouts: The
>> have their own measure and layout-logic. These two subclasses don't have
>> any method or logic to capture or handle touch-events.
>>
>> Thanks!
>>
>> On Tuesday, October 9, 2012 11:31:03 AM UTC-4, Piren wrote:
>>>
>>> ViewPager is part of the support package and inherits from a ViewGroup ,
>>> it shouldn't matter much which OS version it runs on.
>>> I have a similar setup and i dont experience this issue (using support
>>> package v4, i assume you're using the same since you said you tested on
>>> earlier os versions).
>>> I can even press a button and see it switch to its pressed state and
>>> then start a swipe without generating an onClick event.
>>>
>>> What is your targetSdkVersion?
>>>
>>> On Tuesday, October 9, 2012 4:27:31 PM UTC+2, Streets Of Boston wrote:
>>>>
>>>> Hi Kostya,
>>>>
>>>> Thanks for your answer.
>>>>
>>>> This bug (?) only happens on Jelly Bean (I don't have ICS devices to
>>>> test it on).
>>>> It works fine on Honeycomb and lower OS versions.
>>>>
>>>> It seems there is indeed a regression of the ViewPager in JB (and
>>>> possibly ICS).
>>>>
>>>> Thanks.
>>>>
>>>> On Tuesday, October 2, 2012 12:47:41 PM UTC-4, Kostya Vasilyev wrote:
>>>>>
>>>>> Sounds like a bug in how ViewPager dispatches events (sorry for
>>>>> stating the obvious). I'd consider looking at the source and comparing it
>>>>> to ScrollView (which handles nested touchable areas just fine).
>>>>>
>>>>> -- K
>>>>>
>>>>> 2012/10/2 Streets Of Boston <[email protected]>
>>>>>
>>>>>> Hi everyone,
>>>>>>
>>>>>> I have a ViewPager that contains pages, each page with a bunch of
>>>>>> Buttons (or clickable TextViews). When I set the buttons to
>>>>>> 'setClickable(false)', swiping the ViewPager to another page works fine
>>>>>> all
>>>>>> the time.
>>>>>>
>>>>>> However, when the buttons are clickable (OnClick listener is set),
>>>>>> the ViewPager won't do anything if the user put his or her finger down
>>>>>> on
>>>>>> the button when he or she starts a swipe or scroll. If the user swipes,
>>>>>> the
>>>>>> button 'eats' all the touch-events (MotionEvents).
>>>>>>
>>>>>> Is there a convenient way to make these buttons/textviews clickable
>>>>>> and make the ViewPager swipe even if the user puts his finger on a
>>>>>> button
>>>>>> initially?
>>>>>> (I'd like to avoid hacks and using GestureDetectors if possible)
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>> --
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>>>>>
>>>>>
>>>>>
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