Children not clickable outside parent view

Question

I have a created a mapview with markers on it. Looking at this picture below:
Grandparent is a filling View
Parent is my MarkerView
Child is a marker which is clickable

Parent has clipChildren(false) and thus the children are visible.

My problem is that the children are clickable, except for the part where Child 2 is outside the Parent. Parent also has the appropriate TouchDelegate (and I also tried this for the children).

How can I make the complete child clickable?

Have you tried `setClipToPadding(false)`? – Samuel Eminet May 07 '18 at 13:05 — Samuel Eminet, May 07 '18 at 13:05

score 1 · Accepted Answer · answered May 08 '18 at 13:27

1

I couldn't make it work without changing the elements.
I ended up enlarging the parent and using setTranslationY for the markers to keep them in place like this:

answered May 08 '18 at 13:27

HansElsen

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score 0 · Answer 2 · edited May 16 '18 at 02:48

0

I had a similar issue and fixed it by setting app:elevation="XXdp" to the child.

edited May 16 '18 at 02:48

Andrew Myers

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answered May 07 '18 at 11:35

JohnTheWalker

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I tried this just now, but it's not working. I had the setElevation(100f) for the children without succes. Then setElevation(0f) for the parents, but still nothing. – HansElsen May 07 '18 at 11:58
Have you tried using the layout tool to see how the layout is being drawn? – JohnTheWalker May 07 '18 at 12:08
It doesn't draw anything unexpected. No abnormalities. – HansElsen May 07 '18 at 13:39

score 0 · Answer 3 · answered Sep 10 '22 at 23:51

The reason why you can't do this is that the default implementation of ViewGroup#dispatchTouchEvent(MotionEvent ev) iterates over the children (not the grandchildren) to look for a child that are a target (is on bottom of the click event point) and can receive touch events. It will find nothing if you touched the part that it is outside the bounds of Parent, which is the only child of Grandparent. If it does not find Parent, Parent will never be able to make a look up on its children (Children 1 and Children 2) and eventually dispatch the event to Child 2.

So you either increase the size of Parent (as the acceptable answer), which is the most easy way, or you will have to override the method ViewGroup#dispatchTouchEvent(MotionEvent ev) of your Grandparent to make a more complex lookup, like looking up grandchildren too. The method is already fairly complex, if anyone finds a implementation, please share because I don't have one.

Children not clickable outside parent view

3 Answers3

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