You can do this yourself by just say subclassing a FrameLayout (or the layout manager of your choice) and calling out.
I really recommend implementing your own layout manager for this kind of stuff, though, because it is important to fully participate in the layout when you want UI elements to visually cooperate together. On Thu, Aug 25, 2011 at 10:44 AM, Doug <[email protected]> wrote: > On Aug 23, 10:05 am, Dianne Hackborn <[email protected]> wrote: > > You need to participate in the view hierarchy as a layout manager, do get > > the onSizeChanged() calls and such. > > Since it's come up, it's actually been a thorn in my side to have to > "be" a layout manager to know something simple such as the size of a > view when it's changed size. It comes up again and again for some > things I do. It would be a huge save of time and effort if I could > just register a listener on a View to know when its onSizeChanged > method has been called. > > For example, if I want to place an overlay on some arbitrary view as a > callout or popup, I need to know its size and position the moment > those things are known. I can't do it during any of the activity > lifecycle methods because layout is a different stream of computation > than the lifecycle. Same thing goes if I need to compute coordinates > for an animation that happens at activity startup rather than on UI > events. > > I've seen people hack up ugly polling looping to find out when layout > completes! And it seems like huge waste of time just to implement a > custom View or LayoutManager just to make this work. I hope that I'm > just going about this the wrong way and that there is a more elegant > solution. In the absence of that, having a hook into a view's > onSizeChanged would be a huge win, IMO. > > Doug > > > -- > 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 > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. 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
