Take a look at ScrollView or AbsListView:
https://github.com/android/platform_frameworks_base/blob/master/core/java/android/widget/ScrollView.java#L438
The basic idea is to override onInterceptTouchEvent, consume the initial
ACTION_DOWN and then figure out if the user is trying to
scroll/fling/zoom or not.
In the latter case, onInterceptTouchEvent should eventually (for some
subsequent event) return false, thus enabling the user to interact with
child views.
-- K
On 04/01/2012 01:04 AM, momo wrote:
I've got a container that allows 2-d scrolling, fling, pinch etc.
This has several layers within it - a viewgroup for image tiles,
another for path drawing, another for markers, etc.
This all works fine. However, in one particular implementation I have
several "invisible buttons" to indicate hotspots (which are basically
ImageViews with transparent backgrounds). When tapped, an action occurs.
The problem is that with these hotspots (which cover a good deal of
the entire area), the touch event is consumed and not passed to the
container's TouchEvent, so the container does not scroll.
My first attempt was to create a custom view for the hotspots, and
override onTouchEvent, returning false on ACTION_DOWN and true on
ACTION_UP (so the event fires when the finger goes up, which is fine).
However, it seems that when returning false on ACTION_DOWN prevents
ACTION_UP from ever firing.
I also tried overriding onInterceptTouchEvent on the scrolling
container, and "stealing" the ACTION_DOWN event from child views -
this had the same result.
How can I continue to drag the container (whether or not the down
event happened on a hotspot/child view), and react on ACTION_UP when a
hotspot is clicked?
TYIA.
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